Opa1656 vs opa1612 vs opa16 sound quality. Close to zero DC mv at its output would enable removal of the dreaded electrolytic coupling caps which will definitely lower colouration and OPA1611, OPA1612 SBOS450C –JULY 2009–REVISED AUGUST 2014 OPA161x SoundPlus™ High-Performance, Bipolar-Input Audio Operational Amplifiers 1 Features 3 Description The OPA1611 (single) and OPA1612 (dual) bipolar-1• Superior Sound Quality input operational amplifiers achieve very low • Ultralow Noise: 1. The Opa1612 is the audio version so they made the specs slightly The TI OPA1612 dual operational amplifier benefits from excellent technical characteristics, allowing very good electrical and audio performance. 1• High-Fidelity Sound Quality • Ultralow Noise: 2. So you'd be "degrading" the performance by going that route (even My OP1656 OpAmp Review. Part Number: OPA1612 Other Parts Discussed in Thread: OPA1622, OPA1688 Hello, I am considering the OPA1612 as a headphone driver replacement for JRC2114. This gave me a chance to Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. The OPA1612 and OPA827 are much better than any of these but these are SOIC and you’ll need an adapter with experience soldering skills. All I have done is an A/B with my favourite op amp, the LM6172, and it didn't come off that well, though you could certainly tell the hard work that had gone into it. In my case compared to OPA1656, OPA1612, Muses 8820 and some other cheaper op-amps - V6 added more quality in every aspect: Bass became more pronounced, Vocals became Hi Ervin, Yes those devices are very popular, unfortunately I don't have any way to know for sure when they are back in stock. Description: OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers. OPA1622 was targeted specifically for headphone applications, while OPA1656 is a more general purpose device meant to address analog signal processing in line level audio circuits. The A07 now gives a very pleasing, laid back and an analog, almost vinyl-like sound quality to the music! Bass performance is also quite noticeably improved as well. It made a difference in sound and I'm not gonna deny that. 7 pA/rthz) will multiply with the pickup resistance (varies quite a bit, say typical is 10 OPA1611, OPA1612 SBOS450C –JULY 2009–REVISED AUGUST 2014 OPA161x SoundPlus™ High-Performance, Bipolar-Input Audio Operational Amplifiers 1 Features 3 Description The OPA1611 (single) and OPA1612 (dual) bipolar-1• Superior Sound Quality input operational amplifiers achieve very low • Ultralow Noise: 1. Standard opamp for that has pretty much become OPA1612. Found a few interesting opamps on TI website: OPA1612 - bipolar input transistors, 0. I am planning to replace the NE5532 in my Burson Funk with the OPA1656. and I’m looking into changing out the opamp for something a little higher quality. The Opa1652 and Opa1656 sound fantastic in those zishans I had both as buffers and they really brought out the best in driving my favorite op amps. The OPA1662 and OPA1664 series of op amps offer rail-to-rail output swing to within 600 mV with 2-kΩ load, which increases headroom and maximizes dynamic range. Still waiting for someone to show off a CMOY with OPA1656. TI’s LME49860 is a 2-channel, 44-V, high-fidelity, high-performance audio op amp. Link for opa1622 and opa1612 link I got this OpAmps more than year ago and still can't be trusted, but 1612 need soldering and SOP8 to DIP8 converter. It was recently re-capped and all new guts put in . Source: Linux Mint Debian Edition + EasyEffects + PipeWire + 192khz upsampling Interface: Black Lion Audio 2x2 Revolution Speakers: Presonus Eris E8 Headphones: DT880 250ohm Tweaks: Topping HS01, Ifi AC Purifier, Ifi Isilencer 3. nishamn27 Member. Jan 10, 2016 #1. The LME49860 is unity gain stable. In the meantime we will wait for the customers feedback on the component values in order to check the stability of each op amp below using the OPA1656. A 1mV offset like OPA1642 ( also Jfet) = 5mV , definitely a click when relay switches. The sound quality of an opamp is strongly dependant on it's implementation. Currently rocking the BUF634AU in it. All the talk about noise being added to the stage goes through the window. From a first sight this has nothing to do with audio, but the research work on signal processing was very useful for audio. The subjective sound is incredible. but the difference between opa2604 and LME49720 is much smaller than the difference between these two compared to the original ne5532. 1 Noise OPA827 vs OPA1656. Review. We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). The OPA1622 offers extremely-high ac PSRR and CMRR specifications that eliminate noise from power supplies, making the OPA1622 Also, I typically preferred simplicity in the op amps I developed. Note, I think weight is important to show quality, here you have 750g vs 2kg. Hello , Welcome to JAK A true FET input stage was incorporated to provide superior sound quality and speed for exceptional audio performance. Since I am not interested in the V6 Vivid Dual that it comes with. Home Amplifiers. Some people have more recently started using OPA1656, which are very good, although they are a little less authoritative in the bass. Electronic Components Datasheet Search English Chinese and has a long history of delivering high-quality, reliable products to its customers. It is great to have some LM4562 www. It consumes the same power as the OPA2134, which is used all Most of the sound quality of a DAC is determined by the quality of the circuitry and quality of parts surrounding the DAC chip. It does sound like the Opa1612 is ideal for what I need it for! I can always add the AD797 in the output stage Then there’s the quality of the recording and also what type of genre of music that will emphasize certain features of the AD797 (military grade?!) that weren’t designed for music. 1 OPA1656 instead of OPA1612 by thuanth » January 27th, 2024, 2:57 pm I'm thinking of building a couple of a24 boards and want to try T. I wish to hear something about OPA1612 vs LM4562 The OPA1602 and OPA1604 bipolar-input operational amplifiers achieve very low 2. Forums. It is a bit of a science project, but I am seeing nice audio performance and I am using John's opa1656 as the primary output buffer. 4nV/rtHz both flat. Quote It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211. These devices also offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. 8 40 Reviews ౹ 155 sold. Mouser offers inventory, pricing, & datasheets for Texas Instruments OPA1612 Series Audio Amplifiers. Compare the datasheets. lib file into the related LTSPice folder 2. The DAC chip itself is not usually the limiting factor, nor are the opamps by themselves. It ensures a very low noise density of 1. VCM = VOUT = midsupply, unless otherwise noted. OPA1656 had respectable slew rate without slew boosting so I opted to forego that circuitry in the audio part. Find parameters, ordering and quality information Not sure if we have the same understanding of "noise figure" but nevertheless, OPA1656 is less noisy than the OPA827, 2. Goggle bill d mod carver c-1. The type or style of the power supply, the instant current it can supply, and how clean the power is are always the defining characteristics of an amplifier and easily the most expensive part of a high quality amplifier. 1-nV/√Hz noise density with an ultralow distortion of 0. 9nV/rtHz vs. 0003%); OPA2604: high slew rate(25v/us, 2134 is 20V/us), high bandwidth(20M, 2134 is 8M) In Active Xover, there are input buffer, filter, output with gain changing. これが使えるならば、さらにデータ上は上位のths4651がいけるのでは？と思い、交換してみたところバッチリでした。解像度、空気感、柔らかさがmuses01、lme49990よりも良く、好みの音です。opa1656が最新でスペックの高さが評判でしたので、最初は期待し And I've tried many Opamps as well: the stock 5532, some directly purchased from TI 5532P and 5532AP, LME47920, LM4562 and finally some OPA1656 and OPA1612 on adapters. Cos the OPA1612 do sound better with normal PSU regulators not Superior Sound Quality; True JFET Input Operational Amplifier With Low Input Bias Current; Precision Operational Amplifier OPA1612 — SoundPlus™ Audio Operational Amplifier with 1. Good decoupling, PCB layout, and circuit topology might be dominant. On mobile, its audio quality tops out at 320kbits/s using a lossy Ogg Vorbis codec, which is roughly on par with CD quality I talked to a TI/B-B applications engineer today. But this time it's a bit more interesting. 5 Electrical Characteristics: VS = ±2. Explore our portfolio of audio op amps and deliver a superior audio experience to your customers. 5-nV/√ Hz noise density with an ultra-low distortion of 0. Where OPA827 shines is DC precision (150uV offset vs. Kudos But to do that, you have to lose a load of information in the process. Ha ha it's funny because I'm a wide and far reached detailed and accurate fanboy and some people find too many details to be annoying. Although we're used to seeing frequency on a log scale, it tends to distort our perception of how much the low frequency noise contributes to the total integrated noise over the However, it may be the data that supports the sound quality impression of tombo56. I would not classify the OPA1656 as a high speed amp in this context. Unfortunatly with the new OPA1612 I have obtained a lot of noise on the output channel. Best Regards, Chris Featherstone The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. - high levels of DC precision are generally not required by audio customers (audio equipment makers). The good news is that in audio, impedance levels are relatively low so parasitics need to be larger to have a bad effect, and most audio opamps are not really high speed. This device also has a high output-drive capability of +145 mA per –130 mA. the best sounding is OPA1612 ,not for driving headphones -low output current drive ,3ma current consumption ---then opa2134 the best all around as preamplifier it can be used at high gain 6-10 times,very good sounding and Musical,good for biassing in class A. 1nV/√Hz Noise, Burr-Brown™ Here is a copy paste of the result for OPA1656 OPA1656 In the past I have to say I prefered widely the AD precise sound vs the softer traditional TI sound. My first set of separate OpAmps, ushering my foray into the brave new world of OpAmmetryLoL Dry, crisp, analytical and non-intrusive I believe I could reduce the 1st stage noise density to the 4. i expected OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. Description: Ultra-low-noise, low-distortion, FET-input, Burr-Brown audio operational amplifier. Of course that is because in LTspice all instances of the device are identical. 00005% at 1 kHz • High Slew Rate: 20 V/μs • Unity Gain Stable • No Phase Reversal 1piece OPA1656 OP1656 op amp Ultra-Low-Noise Low-Distortion FET-Input Audio Operational Amplifie. This device features excellent output current drive capability, offering rail-to-rail output swing to within 250 mV of the power supplies with a 2 kΩ Texas Instruments OPA1612 Series Audio Amplifiers are available at Mouser Electronics. OPA627 mid-range, especially for the vocals are a little bit more forward in the presentation but more presence and body. 4. Here’s a great article comparing opa2156 CMO vs opa1612. Manufacturer: Texas Instruments. 1 SQ was about the same as other ESS-based dacs in that class. common mode voltage that I've measured on any op amp. ••• Here are the measurements of the dual mono and with different op amps (Sonic Imagery 994, OPA1656, LM4562). You have answered another one of my questions before I ask - input impedance - I was reading earlier about OPA1656 vs OPA1612, and bipolar vs FET. OPA1656 ACTIVE SoundPlus™ ultra-low noise and distortion The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Classics are a bit warmer while SS360x is a bit brighter presentation. Could you please take a look at the diagram and tell me if it is possible? I care a lot. OPA1612: Filter topology for high end audio high pass filter (20 Hz) OPA1612 OPA1656. However, in the The first time I did test with opa1642 opa2156 (precision opamp version of opa1656) opa1612. Compatible Audio & Video Equipment Style. thermal noise (below for 1656): This shows Two cases were evalutated – in a Breeze Audio AK4495 based DAC, driving a ATHA5000 amp (listening via Beyer T1’s), and then driving a Grado RA1 clone (basically a CMOY circuit) to hear the amp OPA1612 1612 will sound warmer, thicker, mellower and darker with most headphones and IEMs. Can sound quality be quantified per se ? I was expecting them to do a decent implementation with OPA1656 and they didn't disappoint. This op amps offer rail-to-rail output swing to within 200 mV of the power supplies with a 2-kΩ load, which increases headroom and maximizes dynamic range. OPA1612-Q1 www. Tubey, better late than never - I just replaced all NE5532 amps in Benchmark DAC1 with OPA1612 and play it so far for few hours. The music became more lifelike. OPA1656 also has a pole-zero pair in the open loop gain curve to boost the open loop gain at audio frequencies (hence the 53 MHz gain bandwidth product). as these can be unstable and go into oscillation. 81 each 2) OPA1656IDR = $2. the ne5532 looks a bit harder, To start, OPA1656 is definitely not a replacement for OPA1622, the two parts were designed for with very different applications in mind. Page: 42 Pages. 25 V to ±18 V At TA = 25°C and RL = 2 kΩ, unless otherwise noted. OPA1611 vs OPA134 or OPA1612 vs OPA2134. OPA1656: High-Performance CMOS Audio Op Amp (top) vs 1642 (bottom). I no nothing about this. N. (If I am not wrong OPA1656 is a really modern OP Amps from March 2019 vs 2017 for the OPA1692). Ti and others do have interest to make them at the same level as its primary production line of OPA class IC-s. While it still has some treble sparkle, It isn't enough to save its sound of complete mudyness and File Size: 611Kbytes. the differences aren't huge, but big enough to make a change worthwhile. Power rails were hardwired with Kimber TC cable. I also like the specs (AKM velvet sound) better. OPA1642. But I guess that it is the overall level that is of interest. As previously mentioned, amplifiers have a current noise contribution shown as I. It is using the same chips as the Soncoz SGD1 ) At first sight, the DAC is really really well made with quality components Resistor Sound Quality Shootout . There isn't enough info about the topology of the This is my first time doing anything DIY with audio. To hear Bruno's discussion on OPA1656 scroll forward to 33. View more Ship to. New posts Search forums. OP Amp Rolling: the Philips CD753 (aka Marantz CD5000) with MUSES8820 vs OPA1692 vs LME49723 and Others - an article by Paul Hunting on TNT-Audio, Internet HiFi magazine, www. asy using the ADA4627 as a template 3. My understand if noise isn’t a problem the opa1656 is great alternative to the opa1612. To accommodate the power-supply constraints of many types of audio products, the OPA167x operate over a very-wide supply range of ±2. The OPA1652 and OPA1654 op amps offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. Also FWIW, the 1820m with OPA1656 in it hasn't been recapped yet but they chart to still be reasonably healthy. Both (I believe have Fet-inputs) There’s also 2189 CMOS audio op amp has impressive specs of an impressive was designed for MUX friendly DACs and multichannel dacs! I want to drive a non-inverting OPA1656 from the wiper of a volume pot -- which means a range of source resistance for the OPA1656 from 0 to <del>Rpot/2<del> Rpot/4. LM4562 Units Symbol Parameter Conditions Typical(3) Limit(4) (Limits) AV = 1, VOUT = 3Vrms A fair question! And although I was the product definer and systems lead for this part, I don't get 100% control over the marketing folks But, I can honestly say that when we started working on this part about a year ago, I was very adamant that I didn't want to create a part with excellent specs but terrible sound quality in the real world. 8ma quiescent current per channel - half as much as OPA2134,OPA1656 is the best boise performer now, but there many different purposes with different requirements. 6 fa/rtHz broadband current noise. What is not to like about this. 99uV, or a THD+N of -131dB below 3. Show The Audiophonics OPA1612 operational amplifier is based on an authentic Texas Instrument 1612 chip. Click to expand These graphs show have different scales. The soundstage was very similar to the LM 6172. 3mhz. ti. There are newer products that are a much better value, even if one chooses not to use the excellent OPA1656, see attached Joined 2006. 01 on the video below. g. I did an A/B comparison to LME47920 (metal cans), burson V5i, V6 and also the Sparkos Pro discrete op-amps on one of my DAC's. 5-nV/√Hz noise density with an ultra-low distortion of 0. I measured again the noise of OPA1656 vs OPA1642. - LMP8672 (probably discontinued) - OPA1612 (which is barely available in SOIC8 at the moment) - ADA4898-2 - OPA1656 (if the circuit around it is right, it performs like opamps which are much more expensive, because of the FET Input stage it doesn't produce so much noise even with higher resistor values on its inputs) - AD8599 ( not a The trade off would be noise vs stability. The schematic, spectrum and results are given below. This Audio Operational Amplifier achieves outstanding The 5532/5534 is an excellent sounding and very durable work horse; the OPA134 series can be adequate too. com SNAS326K –AUGUST 2006–REVISED DECEMBER 2013 ELECTRICAL CHARACTERISTICS FOR THE LM4562(1)(2) The specifications apply for VS = ±15V, RL = 2kΩ, fIN = 1kHz, TA = 25°C, unless otherwise specified. If you need the exact apples-to-apples comparison data, we have to acquire the THD+N vs. NE5532 is a very good amplifier especially for the price ($0. The bit-rate at which an MP3 is recorded also affects the sound quality. However, I should point out that broadband noise in most audio applications is way more important. Now all the folks are using opa2134 op -amps as the replacement. A true FET input stage is incorporated to provide excellent sound quality and speed for exceptional audio performance. 1 nV/√Hz at 1 kHz 1. with the opa1612 in place, it is actually fairly close to the i/v from the ak4499 datasheet, except the i/v resistor value is 340R and decoupling cap Just going into some more details with the OPA1656: with an average 3. The OPA1611 and OPA1612 offer rail-to-rail output swing to within 600 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. The OPA2156 is a new, high-performance op-amp from TI. Would you recommend your OPA1656 for this task, or the OPA1642 (i'd be using SOIC to DIP adapters as the older TL072's are in DIP IC sockets). 9nV/√Hz voltage noise density and 6fA/√Hz current noise density. OPA1656: High-Performance CMOS Audio Op Amp . 2-nV/√ Hz noise density and distortion of –127 dB at 1 kHz. this is typical of such measurements. So, parts are not spec'ed for or I would recommend the V5i if you like your amplifier/DAC but want to make it sound cleaner, clearer: and the change V5i brings out is incredible. Page: 23 Pages. The LPF section in every DAC is very critical. Sep 18, 2023 you are whole heartedly welcome to try swapping em. Texas Instruments' OPA1612 bipolar-input operational amplifier achieves very low 1. Most audio analyzers like AP have bandwidth limiting filters at 80kHz, with 500kHz being the OPA1656 really is excellent. 8 nV/√Hz at 1 kHz • Ultralow Total Harmonic Distortion + Noise: –119 dB THD+N (142 mW/Ch into 32 Ω/Ch) OPA1622 ideal for use in portable-audio applications. Ok, I know the dc offset is a result of each opamp chip's final laser trim and can/will vary. The OPA1656 has higher Iq but also higher gain bandwidth I found that OPA1612 was in the ultimate soundplus collection that's why i have change for it. OPA1656 : 500 uV , Hi there probaly a simple question maybe not. There is no practical audio program material which will have 24dBu (which is what 17. 00006% at 1 kHz. The OPA1622 operates over a very wide supply Big difference in price but not necessarily sound quality using your ears, as the test bed Factor in that the ADA4627-1 is a single & OPA1656 is a dual Good info none the less, thanks, JohnC and the the TI/BB team should be very proud of their accomplishments. Is the 2134 the right choice. Added a new OPA1656. For the case of The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. The OPA1632 has an excellent gain bandwidth of 180 MHz, and a very fast slew rate of 72 V/µs that helps to produce exceptionally low distortion. I used though the better TIs in output stages of middle class DACs as these benefitted from a more round /warm presentation with less details, as that masked their weaknesses and in fact The OPA169x operational amplifiers achieve a new level of performance for low-power amplifiers with a low 4. It sounds great too. e. Electronic Components Datasheet Search OPA1656: 3Mb / 38P [Old version datasheet] OPA165x Ultra-Low-Noise, Low and has a long history of delivering high-quality, reliable However, swapping opamps seems to be more dependent on the surrounding circuitry, their quality and PCB layout, than the opamp itself. I was really looking at the opa1656 but it seems like it’s going to take a month and a half to get here The OPA1652 (dual) and OPA1654 (quad) FET-input operational amplifiers achieve a low 4. tnt-audio. 2021-05-04 10:35 am #555 2021-05-04 10:35 am #555 I'm using the OPA1656. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT AUDIO PERFORMANCE 0. To help others to understand what other audio components are being used, a SML SU-6 and SH-6 are used. 000015% THD, even lower than LM4562 OPA1656 - FET input transistors, 0. TI has characterized the THD vs Rs for a lot of its recent devices, but alas not the OPA1656 (at least that I could find). This feature, in combination with high output drive capability and excellent dc performance, allows for use in a wide variety of demanding applications. So while Bruno prefers the OPA1656, I wouldn't discard a build with the OPA1612. 000015% THD+N Total • Audio Effects Processors • Musical Instruments • A/V Receivers • DVD and Blu-Ray™ Players • Car Audio Systems 3 Description The OPA1652 (dual) and OPA1654 (quad) FET-input operational amplifiers achieve a low 4. This Purifi is made with good quality components and H2000 Case, made in Italy. The amp is fully balanced and available in Grey and Black with 10mn front panel. A pair of *genuine* OPA1656's is the consummate and necessary upgrade for it's stock NE5532 opamps. The 627/37 con is that they are OPA1642 sucks 1. The difference for the OPA627 is far more Application Report Understanding Op Amp Noise in Audio Circuits Tyler Noyes, Tamara Alani ABSTRACT One of the greatest design challenges when building a high fidelity audio circuit is how to reduce the total system This article enforces datasheet, pinout, review, applications, features, and more details about OPA1656 Audio Op Amps. And then the realization thanks for your tips! i have tested the opa2604 and the LME49720 compared to the ne5532. So : you can "custom" your sound with your favorite DIP OP amps. I did not Hi John Yes, did it my way 1. 25 nV/√Hz • High speed: – Slew rate: 72 V/μs – Gain bandwidth product: 180 MHz • Fully differential architecture: – Balanced input and output converts single- The high bandwidth and high open-loop-gain design of the OPA1656 provides a low distortion of 0. Sansui AU-517 (modded). They can run much higher power, have much deeper class A bias, and deliver a much more realistic and detailed sound. 100uV offset x gain of 5 = 0,5mV . 8-nV/√ Hz noise density with an ultralow THD+N of –119. First to try was opa1656, didn't work, sound too sharp. I Technically speaking, it's really hard to beat opamps like AD797, AD8599, OPA1612, OPA1656, so it might be safer to use one of these over the "exotic" ones, The OPA1655 and OPA1656 (OPA165x) are Burr-BrownTM op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. 00005% at 1 kHz • High Slew Rate: 20 V/μs • Unity Gain Stable • No Phase Reversal OPA1612 is bipolar input opamp. 004% @20KHz The above parameters are insignificant to the audio level variations imposed by substandard audio recordings, room modes and compromised SMSL SU-10 vs M500 MKIII vs DO300 21 vs 9 vs 11 dual op-amps OPA1612 (accoring to the spec from smsl-audio) What is the Op-amps doing in that? M500 SINAD Reviews. Anything can be adapted to anything, even 8 pin dip to 8 pin soic. 1 The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. These sound great and outshine many of the other modern high performance audio opamps out there today. Also the OPA1612 does have the highest quiescent over the other opamps we're talking about it will be the hottest. The OPA1602 and OPA1604 series of op amps offer rail-to-rail output swing to within 600mV with 2kΩ load, which increases headroom and maximizes dynamic range. Lower one goes to 100k top to 100mhz. I agree with you, OPA1612 is really good regarding details resolution, OPA1656 has the best of both world : ultra high definition regarding micro details and very neutral but still warm. Click here to have your audio equipment measured for free! Forums. OPA1656: High-Performance CMOS Audio Op Amp Could someone help me, please? I would like to replace the RC4558 with the OPA1612. Thread starter oldphaser; Start date Jan 10, 2016; oldphaser Chief Journeyman. Using excel we can plot out the voltage noise, current noise, and This question is triggered by a repair I recently did where the originals, while still available, were stupid expensive. 25 V to ±18 V Personally I loathe the sound of the LM4562 but I haven't really given it a full chance, tailored to its characteristics. BTW you have now 2 reasons NOT to use LM4562 :) Search. 500uV for the OPA1656) but that's largely irrelevant for audio applications. Modded TPA3255 with modded Meanwell There are some things to watch out for when swapping op amps. However, this compression does not necessarily mean a compromise in audio quality. Only really better substitution for NJM4580 for example as Pre-Amp can be no less then OPA2228 or even better OPA1612, but for that -3dB less noise (and distortion) over whole audio spectrum you will have to play premium extra. I don't care about listening tests or something else, just Even AD797 or OP627 cant hold a candle vs OPA1612 in terms of SQ - the difference is HUGE! My preamp sounds best with OPA1612 for gain and OPA2192 as Speed is a key concern for video conferencing systems, so we want an audio amp that has a high slew rate as well as a high gain bandwidth. The 134 remains available in the DIP package in singles, duals and We add the following graph below to our audio device data sheets to show at what impedance the noise will be dominated by input current noise*source resistance vs. 1-nV/√Hz as well as an extremely low distortion level of 0. Taking advantage of a wide power supply range and mounted on a DIP8 bracket, it The idea is that the bipolars give accuracy and low noise, while the JFETs give speed and ‘the sound quality of JFETs’. Also pricing for 1000+ isn't really that expensive for opa1656, opa1602, opa1612. It would cost some serious cash to get 8 channels of this quality. TI-Produkt OPA1656 ist ein(e) Burr-Brown™-Audio-Operationsverstärker SoundPlus™, extrem rauscharm und verzerrungsarm. 1) ADA4627-1ARZ = $7. The FET-input architecture achieves a low 2. To And no, I didn't perform any subjective listening tests to judge the perceived sound quality, so sorry, I can't provide any qualified audiophile journalistic waffle. I still have some channels of 2068 with old caps, so can A/B and the difference is shocking in a very good way. Any chance you have some measurements of the OPA1612 compared to the Sparkos SS2590 for the regular FYI I'm about to order an Audiophonics HPA-S400ET with OPA1612 instead of OP275. for low frequency noise. The specs on the opamp are really good, almost as good as the OPA1612 (and better in some ways that will be covered below). Now they seems to have changed again to opa1612 in many places - maybe a suggestion to try ? I have tried ne5532, opa2604, lm4562 and opa1612 and I prefered LM 4562 in both Aiyima a07 and the tpa3251-based Aiyima a04. rodtor How to compare different brands of purifi amps sound quality wise ? I doubt that the OPA1656 is made on a jellybean CMOS process. This OPA provides very good electrical and audio performance. Review Index. The prototype here is made with an OPA1656 dual opamp and the initial impression is that I was on to something with this idea, because it does sound very good. This device features excellent output current drive capability, offering rail-to-rail output swing to within 250 mV of the power supplies with a 2 kΩ Recently I reviewed the Nord Three SE 1ET400A Dual Mono Stereo Amplifier. As it is, if it measures worse than the eval1's buffer (fe02 iirc) which uses the Opa1612, is it because the buffer board is overall inferior or only the opamp? Click to expand I would like to see the OPA1656, a burr brown The OPA1642 is significantly inferior to the OPA1612 in many regards (GPW product, output drive, distortion vs output load, input voltage noise for example). 5). -131 dB THD+N at 1kHz, 600 ohm The OPA1612 has lower noise and distortion than OPA1656. 75V peak corresponds to) at 20kHz. Super stoked to put those bad boys in as I’ve heard nothing but great things about This OPA1656 OPA from Texas Instrument offers very good performances for audio use. But more importantly, it's CMOS. com [ Home | Staff & Contacts LME49723 vs OPA1612. I’m 1• High-Fidelity Sound Quality • Ultralow Noise: 2. I try to use a cheap component like NE5532P, no noise, with OPA2134 no noise with the OPA1612 a lot of noise. But that does not say anything about the SQ. OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. Encuentre parámetros, información sobre pedidos y calidad SoundPlus, cuádruple OPA1611 — Amplificador operacional de precisión con ruido de 1,1 nV/√Hz y baja potencia OPA1612 — Amplificador operacional de audio I propose this group Buy for a brand new Purifi Amplifier with a Custom Buffer using OPA1656 DIP8. 1 nV/√Hz at 1 kHz • Ultralow Distortion: 0. parametric-filter Amplifiers; parametric-filter power supply rejection, and low input bias current. Low THD and Precision OPA1612-Q1 Burr-Brown™ single audio operational The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. Look very similar in the same range. The OPA1612-Q1 bipolar-input operational amplifierachieves very low 1. Status This old topic is closed. I measure iv opamp output with a cheap dso scope (can only do min 20mv and 1uS) and saw a huge amount of noise 38mV at around 1. However, if you want the best possible stereo imaging and resolution with regard to phase critical stereo information, much lower distortion is Is OP Amp swapping the key to better sound quality or a complete waste of time?Op Amps: https://fosiaudioshop. The FET Using the OPA1656 and OPA1612 we can see how the different noise sources can affect the overall noise. R. I don't have the books you mentioned but I do The LM4562 is an exception, but otherwise it are the fast op-amps that JRA has trouble with: Misbehaving: OPA1656, gain-bandwidth product 53 MHz LME49990, 110 MHz OPA1612, 40 MHz Behaving well: OPA2604, 20 MHz OPA627, 16 MHz OPA2107, 4. 25 nV/√Hz • High speed: – Slew rate: 72 V/μs – Gain bandwidth product: 180 MHz • Fully differential architecture: – Balanced input and output converts single- Like many opamps, the OPA1656 does NOT have constant gain-bandwidth product. Any chance you have some Reviews. 00008%, 2604 is 0. 000028% • Low noise: 1. In order to make audio files up to ten times smaller than CD quality files, some original data must be discarded, resulting in a loss of sound quality. frequency data with your expected condition, but it take some Would have been interesting to see how the TI Opa1612 would have performed as well in the custom buffer board. So, it is a different design and chip. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has Part #: OPA1656. 00003 THD, Voffset = 1mV - I'm thinking to use this one for servo. However, as shown in figure 6 closed-loop gain vs frequency (see amplification at 20db) this operational seems to "like" large amplifications, over 30db! Under these conditions, in many of the usual applications that require a 1x 2x amplification, the so-called noise gain artifice must be The OPA1656 has 6dB more open loop gain at audio frequencies, hence the better distortion. 00 : Crosstalk - 110dB PSRR - 80dB min, typ 100dB Distortion - 0. The OPA1642 has the JFET input stage- thus reducing the input current noise- reduced common mode input distortion and sensitivity to source impedances, and lower standing The OPA1662 (dual) and OPA1664 (quad) series of bipolar-input operational amplifiers achieve a low 3. OPA1612 is fuller sounding - especially lower midrange but also more dynamic. In fact it can even introduce discontinuities into the gm vs Vdif curve. Show hidden low You can replace them with 10 uF in the electrochemical of ELNA SILMIC II, but for better sound quality, it is still recommended to use film capacitors. 3 nV/√ Hz noise density with an ultralow distortion of 0. I prefer the opa2211 over the opa1612 (same chip but with less better specs). OPA1656 de TI es amplificador operacional de audio Burr-Brown™ SoundPlus™ con ruido y distorsión ultrabajos. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz OPA1632 High-Performance, Fully Differential Audio Operational Amplifier 1 Features • Excellent sound quality • Ultra low distortion: 0. OPA1611, OPA1612 SBOS450C –JULY 2009–REVISED AUGUST 2014 OPA161x SoundPlus™ High-Performance, Bipolar-Input Audio Operational Amplifiers 1 Features 3 Description The OPA1611 (single) and OPA1612 (dual) bipolar-1• Superior Sound Quality input operational amplifiers achieve very low • Ultralow Noise: 1. try modding with better FET input opamp, like OPA2107 or OPA2111 Show hidden low quality content. I too find that the OPA1612 and OPA1642 are fantastic upgrade/replacements in a whole lot of professional and consumer audio gear out there equipped with comparatively outdated opamps. (Leaf Dac Dual 9038Q2M ) This DAC is using a dual 9038Q2M chips and fully balanced and also equipped with DIP8 OP amps and removable BT module. I have a 1988 carver stereo per-amplifier. pdf (sorry, pasting the address makes a huge link) you use a Application Report Understanding Op Amp Noise in Audio Circuits Tyler Noyes, Tamara Alani ABSTRACT One of the greatest design challenges when building a high fidelity audio circuit is how to reduce the total system About OPA1656 DC output offset: depending on gain, a low level circuit with the OPA1656 can show a few mV as output offset. According to the TI datasheets OPA1612 has less noise than OPA1656. There are additional poles and zeroes in its frequency response, which introduce additional lumpity bumpity behaviors in the gain-vs-frequency and phase-vs-frequency plots. The OPA1632 delivers excellent audio quality, very low noise, large output voltage swing, and high current drive. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. Current noise is If this is an audio project, close your eyes and just get the 627 or the 637 depending on the gain needed. Both fet based opamps sounds a little bit more solid in the bass (not Just replace the original op-amp with one with a similar specification, if it's not possible to find an exact replacement. . It might require more capacitance in the LPF of the I/V stage to keep it happy Vs the others. Specifications: OPA2134: OPA1656: Num Channels: 2: 2: Vs min (V) 5: Hi JohnC: I found this thread last night as I was going down rabbit-holes looking for newer op-amps to replace TL072's in a professional audio device that has about 18 of them in each channel. Thread starter (OPA1656) and buffer stage (OPA1656 or OPA1612) with the volume pot (TKD) in between. Download. ADI 825 or any AD requires strict rules for it to operate in due to low PSRR. lib SYMATTR Value2 OPA1656 SYMATTR Description TI/BB Audio FET Opamp to get the TI’s OPA1688 is a 36V, 10MHz, Low Distortion High Drive Rail-to-Rail Output Audio Operational Amplifiers. OPA1656 is positioned for audio I am excited to see if anyone wants to try to use it for audio I am working on an audio reference design using the DAC11001A that I hope to release on the web in the next few months. It The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low. Not much yet on the 1656 as an audio amp. You usually don't get 40V supply capability on such a process. 000015% at 1 kHz; High slew rate: 27 V/μs; Wide bandwidth: 40 MHz (G = +1) i tryed lme49722 opa2134 and opa1612 ,--. 1-nV/√ Hz noise density with an ultralow distortion of 0. Some will point out the OPA1612 (which is even better) or the OPA1656. not going into high frequency oscillation) are different and just swapping ICs may cause problems -- you TI introduces the industry's highest-performance audio operational amplifier Lowest distortion and noise, high linear output current, and low power push the boundaries for professional and 0:00 OPA1656(EQ) OPA2211( voltage follower)1:56 OPA2211 OPA1656オペアンプ回路のノイズ特性として、信号源の抵抗が大きい場合は、FET入力タイプが推奨されると Power supply quality is what defines any amplifier in the end. Altered text SYMATTR Value OPA1656 SYMATTR Prefix X SYMATTR SpiceModel OPA1656. Same opamp could sound more open and with a darker background when tested in equipment #1, but may sound with a much closer scene and with a bit of hiss-noise when installed in equipment #2. In note slyt630. OPA1612 sounds better than any transistor Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. I routinely use OPA1656 and related on adapters without any issues. frequency in 10 - 20kHz might not change in 8Vrms output condition for OPA1612/56, considering with its output impedance curve and full-power bandwidth. The owner then ordered a set of Sparkos Pro SS2590 discrete opamps. The rail-to-rail output swing, I purchased 10 OPA1656's. The xlr input and the trigger are two great additional features, as is the nice and efficient enclosure, however the mono is not true mono, and the 13 db of sinad lost is a bit disappointing, especially given Continue to this OPA627 op-amps, I was quite shocked that the OPA627 can deliver better sound quality than OPA1622 in one specific music aspect. I hesitate to recommend those without simulating Application Report Understanding Op Amp Noise in Audio Circuits Tyler Noyes, Tamara Alani ABSTRACT One of the greatest design challenges when building a high fidelity audio circuit is how to reduce the total system Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. 5Volt, just because the THD with -150dB vanishes in the noise. strangely its probably the most boring sounding one when paired with 400i but the best sounding with hd600 NJM has a more analytical, detailed sound but it sounds a bit thin The Opa1656 has a much wider and better soundstage. Resistor Sound Quality Shootout. They said no problem, easy to work with and quick follow-up. Like in this post, the DAC is dual PCM56P then using internal IV converter to the LPF section. I put together a table below showing devices that have high input impedance and some key parameters for comparison. I want to use it as a pre-amp to power speakers, so voltage of XLR at only 2V RMS on the Leaf is disappointing: Leaf DAC Dual 9038Q2M SPEC : 2x 9038Q2M Weight 750 grams Audio input: Bluetooth / USB / In my honest opinion V6 will be really great addition to any audio system, it uplifts sound quality in every aspect compared to other cheaper Op-Amps. 000015% at 1 kHz. The different players sounded different. 2 dB at 1 kHz, while driving a 32-Ω load at 100-mW output power. 72 each What Order today, ships today. The OPA1622 operates over a very wide supply • Audio Effects Processors • Musical Instruments • A/V Receivers • DVD and Blu-Ray™ Players • Car Audio Systems 3 Description The OPA1652 (dual) and OPA1654 (quad) FET-input operational amplifiers achieve a low 4. Optical is usually restricted to 96kHz. 000035% (-129 dB) at 20 kHz and improves audio signal fidelity across the full audio bandwidth. Details are better on the SS360x while Bass may have had slightly better slam on the Classics. Both devices have specs that are vanishingly low from an audio spectrum basis. The OPA2156 has amazingly good distortion as well, you just might want to load the output a little less than a 1656. The OPA827 for example has superior load drive,much lower distortion and miniscule DC offset. Find parameters, ordering and quality information. While, I suppose the flatness of THD+N vs. com SLOS931A –NOVEMBER 2015–REVISED NOVEMBER 2015 6. When we developed the OPA1656, this was also a major OPA1612 is fuller sounding - especially lower midrange but also more dynamic. My statements were verified: - OPA1611/1612 are optimized for better distortion than the OPA211 (already pretty good). which improves audio signal fidelity. Many high-end audio manufacturers still use THT technology and avoid SMD at the sound-relevant points. The OPA1622 is a slow device compared to the OPA1612/OPA1656. 5nV/√ Hz noise density with an ultralow distortion of 0. In fact, 320 kbps is considered to be the standard for high Many audio opamps have GBW of 10 to 20MHz or so, so at a gain of 1000 the bandwidth will have dropped to 10--20kHz - completely inadequate for audio. com/products/op-amp-chip-muses02 3 Operational Amplifier Current Noise. AUDIOPHONICS OPA1656 Dual OPA DIP8 (Unit) Ref : 19311. Our audio amplifiers deliver clear sound, while enabling you to meet demanding system requirements in both industrial and automotive applications. 1nV/√Hz noise density with an ultra-low distortion of 0. Transients are stronger, both rimshots of snare drum and big-band trumpets. Wide open with a lot of air. Also, a LME49720HA that costs 5 times as much as the PDIP or SMD version should also be interesting in terms of cost calculation. 1/f corners: OPA1612 ---- 10 Hz OPA1642 ---- 20 Hz OPA1656 ---- 1 kHz OPA2162 ---- 1 kHz It also looks like the OPA1642 and OPA2162 are not happy driving ※在庫数欄の表記が『おひとり様 点まで』となっている商品は、現時点で、おひとり様（1団体様）あたりのご提供数量を表記の数量へ制限させていただいている商品です。 OPA1656: High-Performance CMOS Audio Op Amp . I expect that it's made on one of TI's fancy analog processes as are their other recent good-for-audio op-amps. I also have both the OPA1642 (FET-input) and the OPA1612 (bipolar input) in stock and I think these would be interesting candidates as well. The good calculated LPF can reveal the DAC sound potential because Thanks Amir, I was just wondering why the review was taking so long. 1. The characteristics of opa828 are also very good for audio. Poweramps: Accuphase P-300. Low offset is important in audio when you don't use a servo and don't want high offset at the output . I's latest offering, the OPA1656. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz OPA1611, OPA1612 SBOS450C –JULY 2009–REVISED AUGUST 2014 OPA161x SoundPlus™ High-Performance, Bipolar-Input Audio Operational Amplifiers 1 Features 3 Description The OPA1611 (single) and OPA1612 (dual) bipolar-1• Superior Sound Quality input operational amplifiers achieve very low • Ultralow Noise: 1. Normally, that's not newsworthy because higher performing parts are coming out all the time. It's possible the OPA1656 vs OPA1612 difference may be preferred with the 3E Audio 260-2-29A build too? After working with some OPA1612 on my recent Topping PA5 D01 Module replacement project (at ASR), a friend sent me a few OPA1612 opamps he ordered when they were in stock since i couldnt get them anywhere. I just ordered the opa1612 to put in the lpf of my Zishan ak4497eq. At 320 kbps, the audio file is compressed at a high rate, resulting in a smaller file size compared to uncompressed audio. OPA1656 sounded worst, Muses 8920 sounded best. 5nV/rtHz, over 80Khz, gives 0. Take a look at this figure from its datasheet. at audio compression techniques like mp3, or the STI measurement method In general, I cover all range of audio starting with infra-sound up to ultra-sonic, room- and building acoustics and psycho-acoustics. --lme49722 lme4562 lm4562 opamp A higher bitrate generally indicates better audio quality. The OPA1652 and OPA1654 op amps offer rail- Previously I did some changes especially in all technical aspect and evaluate the sound quality improvement from that changes. No regrets with this amp whatsoever after rolling. Noise is still sound, and some of it added to the "Patina". The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. It can be replaced but you'll get diferent sound character. I'm with Jim here. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // It has the most stable input capacitance vs. 1 OPA1632 High-Performance, Fully Differential Audio Operational Amplifier 1 Features • Excellent sound quality • Ultra low distortion: 0. The Is the OPA1612 good enough to feed into an external amp? It's in the Fiio K3s but I want to use it as a standalone DAC TI’s OPA1656 is a SoundPlus™ ultra-low noise and distortion, Burr-Brown™ audio operational amplifier. Parameter-, Bestell- und Qualitätsinformationen finden niedrigem THD und Präzision OPA1612-Q1 — Präzisions-Audio-Operationsverstärker mit geringem Stromverbrauch und 1,1nV/√Hz Rauschen für die Aut In my honest opinion V6 will be really great addition to any audio system, it uplifts sound quality in every aspect compared to other cheaper Op-Amps. The V6 classic was a bit slower on the attack than the SS360x which gave it a bit smoothed over sound compared to the SS360x. Frankly, this product has some points in favor but some against it. Don’t mind me if I sound enthusiastic, Burson is kind of my favorite audio brand given their sound engineering and design philosophy focusing on soundstage & transparency. The amp Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. The OPA1652 and OPA1654 op amps offer rail- LM is the best overall, it sounds the most balanced, very natural/smooth/clean, doesnt exaggerate anything but can sound lacking in impact. I found that these two ICs had similar parameter, but some difference: OPA2134: lower noise(8nv, 2604 is 10nv), lower distortion(0. Two schematics in parallel and eight in parallel for both 1656 and 1642 were measured. 9nV/rtHz broadband voltage noise. Copied the given . This is incredibly close to the R2R sound. 3 nV/rtHz lower limit of the OPA1656 (at 1kHz) by eliminating the 3 input resistors and reducing the feedback Sound quality was my first priority, as for form factor, no problem doing 8 pin soic to dip. Thank you very much in advance. It could sound pretty good, but one could get sound just as good from IC opamp designs. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). OPA1655. 00005% at 1 kHz. 0, Ifi PowerX 5V, Thel Audio NT-25HQ, Tourmaline Chinch Caps, Supercapacitor USB Filter When it comes to sound quality, though, Spotify is pretty bare-bones. The recent swap I did was from opa1656 to opa1612 in the v3. 8 bucks for a genuine part. Also audio opamps may have enough input offset voltage to saturate the output for such high gains - if the input offset is +/-3mV and the gain is 1000, the output offset is +/-3V, or Hi amigos, I share with a quick review of an unknown new DAC. Looks like a composite with the LMH6321 is a match made in heaven. The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Pricing and Availability on millions of electronic components from Digi-Key Electronics. Lets take a look at the NE5532 op-amp, used in audio products everywhere since 1979 and it costs about a $1. 00003% at 1kHz. Joined Sep 8, 2012 Messages 848. Audio, Audio, Audio! OPA1611, OPA1612 SBOS450C –JULY 2009–REVISED AUGUST 2014 OPA161x SoundPlus™ High-Performance, Bipolar-Input Audio Operational Amplifiers 1 Features 3 Description The OPA1611 (single) and OPA1612 (dual) bipolar-1• Superior Sound Quality input operational amplifiers achieve very low • Ultralow Noise: 1. Reactions: Ornette, ironhorse128, rodtor and 1 other person. I'm up to, to design a 3rd or 4th order 20 Hz high pass filter with ultra low distortion. Old op-amps such as the LF412 and TL072 are A quick snapshot of the OPA1656 performance specs: 2. Apollon Audio Class-D Amp Build Quality. OPA1612 is the same thing as OPA2211 (dual of The new breed of TI J-Fet opamps offer superior performance to that old soldier the OPA2134. Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. It occurred to me that a more modern & higher performing part must exist at a lower price - a win-win scenario if ever there was one. That final phrase is not a happy thing to see on a datasheet from a major manufacturer; the sound of JFETs (if any) would be the sound of high distortion. 000015% at 1kHz. If you want to reopen this topic, contact a moderator using the "Report Post" button. Superior sound quality; Ultra-low noise: 1. For example the OPA1678 has a much higher gain-bandwidth product than TL072 and different output impedance, which means that the criteria for it being stable (i. Below, I have highlighted the components that could be adjusted if this the issue. Search titles only By: Search Advanced search Search titles only I'm wondering why OPA1644's audible sound quality is so much better while RMAA measurement result is about the same as 2074 The high bandwidth and high open-loop-gain design of the OPA1656 provides a low distortion of 0. That unit came with the Sonic Imagery's 990ENH discrete operational amplifier ("opamp") in the buffer stage (pre-amplifier). View attachment 1100451 View attachment 1100452. It has a very good dynamic range and a low level of harmonic distortion. Sound is more "color", and "massive". To check if they will match the previous ones that were made with balanced 10x paralleled op-amps. The J-FET NJR MUSES01 dual input PA offers excellent sound quality, marked by high precision and The OPA1622, dual, bipolar-input, SoundPlus™ audio operational amplifier achieves a very low, 2. In my case compared to OPA1656, OPA1612, Muses 8820 and some other cheaper op-amps - V6 added more quality in every aspect: Bass became more pronounced, Vocals became That's because it has greater bandwidth available, meaning it can support higher quality audio up to 24-bit/192kHz. The OPA1656/1655 released after the OPA828 are also excellent enough to dispel the image of past CMOS input. OPA1612 is a great amplifier, however, it is bipolar (input type) and when used immediately at the front-end of a guitar input, the input current noise (1. I have a circuit with two OPA1656's and it so happens that one offset is subtracted from another and almost cancels - in LTspice. This is just a theory. The OPA165x Op Amps offer a FET-input architecture that achieves a low 2. Joined Sep 7, 2023 Messages 27 Likes 2. Now i tested opa1612 with lme49720 and 1612 is better in my opinion. OPA1656ID – Audio Amplifier 2 Circuit Rail-to-Rail 8-SOIC from Texas Instruments. Look e. Earphones & Headphones,Speakers,Amplifier,player,Digital-to-Analog Converter (DAC),Professional Audio Equipment. Discrete op amps also permit the use of high quality compensation capacitors, and allow for two pole compensation schemes which are impossible to implement in IC designs. So many choices. png. in Figure 2-2. It is on the mid-range. The main downside to a coaxial digital connection is I think the problem I'm seeing with the OPA2156, and to a lesser extent the OPA1656 is that the 1/f knee for the noise is much higher than for the OPA1612 and OPA1642. 1 nV/√Hz at 1 kHz; Ultra-low distortion: 0. LME49720 sound is boringand too light. Input buffer and There are many newer Audio quality Op Amps available, that are much more cost effective than the very old BB DI products. Without scoping the outputs or measuring the DAC there's no telling if OPA1656: High-Performance CMOS Audio Op Amp. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz vs Burson V6 Classic. Per-Anders Sjöström Prodigy 250 points Part Number: OPA1612 Other Parts Discussed in Thread: OPA1656. At least when I’ve done searches on “best op amp for audio” the OPA627/637 are on or near top shelf in the opinion of those DIYers who listen to many. srjff sikxw poyb ibvf bfhtk lbk ucratwuy tkeu wknf gtn