Opa1612 diyaudio specs reddit

Opa1612 diyaudio specs reddit. The LME49860 is another option. Dec 10, 2015 · 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. A fully differential amplifier with excellent audio specs. 5Vrms signal, 80-kHz measurement bandwidth; 53 MHz gain bandwidth product, 24V/us slew rate >100mA output current; 4. Feb 17, 2023 · I'd go with the LM4562 (= LME49720) instead. Jun 5, 2023 · I have used the OPA1612, AD797, LT1115, OPA1642 and OPA1656 in phono/analog preamp stages for a while now and have conducted extensive listening tests, sometimes double blind, sometimes blind, sometimes as just an unannounced "impartial" observer to listening/comparison/"shoot out" sessions. Jun 5, 2023 · Although specifications of OPA1612 (bipolar) indicate they are superior to that of OPA1642 (JFET inputs) in practice OPA1642 performs slightly better. 0mA typical supply current, 4. Mar 17, 2019 · Voltage noise is higher on 1656 at low frequency til 1khz. ••• Feb 17, 2023 · The OPA1622 is a slow device compared to the OPA1612/OPA1656. Nov 17, 2017 · Hi, after a while i decided to make a dual mono DAC board es9038q2m. I will only tell the fourth Jan 5, 2020 · I did replace OPA1612 for OPA1656, and also switched ADC input range for the 1. Apr 12, 2009 · In summary I did the following changes: • LME 49720 to replace the NE5532s • OPA1612 to replace the OP275Gs • ELNA caps for the coupling caps • Add a 10uf 25V tantalum capacitor on the 5v power supply (rather then changing 30 caps) • Replace the 7805 regulator with a DEXA 70908 The op amps helped but the Dac Magic was still lacking in Jul 5, 2006 · Thanks for the link. <edit> As for why people say FET input sounds better - its most probably about RF immunity of the LTP input. Jan 24, 2020 · Have you also considered other opamps for output stage. TL074 is easily surpassed by OPA1644, that's a no-brainer. I never could understand why Jim Williams, in his modification of the Dolby 363, used BOTH of them, each in a different part of the circuitry. MUSES8820 is the best, IMHO. Tested a lot of OP, including LME49720, OPA1612, OPA1642, MUSES8920 and MUSES8820. Without scoping the outputs or measuring the DAC there's no telling if Apr 7, 2019 · There are three old chips that are better than ne5532 as i/v stage, but there's no discussion whatsoever on DIYaudio about them and i won't ruin the secrecy tradition mainly because one of them was reactivated after 15 years for a short period of time at Mouser and is programmed for EOL, the stock being limited. What's not to like with that, and all the other SoundPlus family? Craig ••• May 26, 2016 · AD8397 is great, just be sure to put 2-3 Ohm output resitor, wirewound 5W should keep the op-amp safe from shorting output to the ground. The higher current drive of the OPA2822 would be beneficial. These discrete regulators already exceed the PSRR and self noise of the Jan 26, 2012 · zergxia I think you'll never see H2 with 1656 <-140-145db if you'll not match the opamps inputs impedance. There are JRC4580 opamps on the TRS inputs and 4 JRC4580 opamps on the 4 main speaker outputs. 7 pA/sqrt(Hz), which fits better with the curve. OPA1656 sounded worst, Muses 8920 sounded best. 3v for oscillator and other 3. Just did an A/B with 2 opamp buffers on my Hypex NC500 monoblocks, which I normally use with no buffer, as the dac has enough gain to drive the NC500 modules direct. I can see several places where this would fit very well, like fully balanced post-DAC Feb 11, 2021 · 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. At least it is my preference when associated with an AK-449x DAC. Mar 9, 2023 · OPA1612 can easily supply 30mA so loads above 150ohm are fine. I know well the opa1612 in the output stage of DAC and while it is good I prefer the sound of AD4898-2 for that application. The PSRR, CMRR, distortion, bias current, offsets will all be pretty lacklustre as the amp is designed to slew ultra-fast above all else. Lots of high performance models hate sockets. I’m guessing a gain of 10 would necessitate an Rf in the 150R-180R range. Jan 14, 2019 · I bought 10 OPA1612 from a chinese ebay seller. It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. Feb 11, 2021 · Dont make me laugh, if you can't hear the difference 5532 vs OPA1612 than you should not be very concerned about SQ (in your case). When we developed the OPA1656, this was also a major design target for us, and the designer and myself spent quite awhile in the lab with previous CMOS audio op amps (specifically OPA1652 and OPA1688) hunting for sources of input capacitance variation. It might require more capacitance in the LPF of the I/V stage to keep it happy Vs the others. Some will point out the OPA1612 (which is even better) or the OPA1656. 5 Euro OP275 ~ 3 Euro OPA1612 ~ 6 Euro According to specs I would think the OPA1642 would be one of the best compromises cost vs performance wise. I noticed a low-cost headphone amplifier board based on Mar 17, 2019 · The OPA1641 would be slightly better. Oct 8, 2001 · ( 49 cents, plus $11 shipping for one of course) We are talking about a chip that is better than a $1000 discrete buffer stage of years passed. Gain stage combined with LPF 50-80kHz, OPA1612 probably composite but not necessary yet. Is this layout ok, even though it's not complete ••• Jun 23, 2019 · 5) I/U OPA1612 or similar with 600ohm feedback resistor and some preliminary passive LPF before I/U stage(ES9038Q2M has quite big out-band noise). ••• Sep 14, 2021 · 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. 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 buffer. If you're prototyping - be sure to apply power at the same time, if your ground connection fails - AD8397 will burn, JRC4556 is virtually indestructible compared to AD8397. There are gain-of-8 specs, with an optimal Rf being 200R. He gives strong recommendations for some applications and also caveats about ill-informed op amp rolling. 5 V - single supply - I would not be surprised to find some common-mode issues. 3v components, ltc6655 and opa1612 for AVCC and VREF, tps65131 +-15v and low voltage through LM317/337. May 19, 2017 · maybe modern production 3886 are all above average? the designs seem to take the 'typical' GBW spec as the effective minimum My guesstimate puts the safe with production variation margin local closed loop gain corner as low as 100kHz for LM3886 with a greater than 4:1 range designing for stable extra loop gain from the nice input op amp really doesn't give much 20 kHz added safe composite loop Nov 13, 2016 · Aren't you comparing the the that1512 at 60dB gain vs the opa1612 at 0dB gain ? At x1, the that1512 is -100dB thd+n (0,001%). 1nv). Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). Mar 17, 2019 · A quick snapshot of the OPA1656 performance specs: 2. You can also try OPA1612 as buffer with OPA2822 for the headphone driver. If you understand how to choose an opamp's based on requirements, you will be able to do so for many other parts. 5mA max May 15, 2022 · Buggle2 Riaa board. This combination will sound slightly more clinical than the OPA2228/OPA2822 combination. Money being no option for this project, I am looking to replace all opamps with the BEST opamps as far as specs go highest frequecsy response 20hz-20khz and so forth. Jan 6, 2020 · Not long after AX published Michael Steffes composite OPA1612/TPA6120A2 design in March, 2021, I decided to give his circuit a try. 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 600 ohms, but the Dec 10, 2015 · Has anyone happened to measure the OPA2156's THD vs Output Voltage into something around 200R at gain = +1? The datasheet graph only goes to a load of 2K. 55), but in inverting mode only. OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. -60dbfs. The 4627 is faster the the 627 (82v/uSec vs. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. Here's what he said: "The board already has exotic Bruno Putzeys designed discrete regulators that power the onboard TI OPA1612 opamps, as well as the amplifier modulator boards. Aug 24, 2012 · The new national opamps are also there with extreme slew rate of 1900v/usec just like AD815. I went through several iterations and settled on JFET buffers to raise the input impedance. Jan 20, 2013 · i intend to use only opa1612 because i like how it sound,has also very good specs-i always set the gain opamp -1st, as multiple feedback LPF (with 56 and 100) i WOULD get excellent q factor and very low noise. 15ppm, intermodulation way below that, 1. I hesitate to recommend those without simulating the circuit. They are ~6. 80 EUR for all ten. CMRR is not a big issue. Cheers May 31, 2024 · Phono preamps: MM need low current noise, so JFET or NE5534A typically, for MC low voltage noise is paramount, so AD797 is a strong contender, as are hybrid designs with low voltage noise transistors like the ZTX951. 3 MHz. Jul 24, 2017 · OPA1612 has like an 80 MHz GBW and 40 MHz fT while being run at a gain of 3, while NJM4556AD is an 8 MHz part. 8 or 2. buffers/summing amp/filters - all the same requirements really, but if there's a pot a JFET opamp doesn't require caps in the wiper path to prevent scratchiness. For the case of Jan 6, 2010 · I have an Onix XCD-99 which is basically a Music Hall CD-25. It enabled the use of better components (actual measured performance) that otherwise Jul 5, 2006 · Hi All, Please advise what would be the best bet for a modern replacement of the NJM353 in my 12-15 years old vintage 4X60W Class A Zero Feedback car amplifier? Tried dual OPA627AU on adaptor but the sound is of reduced volume, of loss details and PCB is warmer than before and the noob in me did not realized the input current of 7mA X 2 or 14mA for the each of 4 dual adaptor as compared to Sep 26, 2020 · It's a DSO212 with the following spec Max sample rate: 10MSa/s Analog bandwidth: 1MHz Max sample memory depth: 8K Analog input impedance: 1MΩ Max input voltage: ±40V(X1 probe) Coupling:AC/DC Vertical sensitivity: 20mv/Div~10V/Div (1-2-5 sequence step) Horizontal sensitivity: 1uS/Div~2S/Div(1-2-5 sequence step) I don't think it's a measurement artifact as I did the same at the lpf opamp Feb 4, 2014 · In places less hospitable to LME49720, OPA1612 has proven to be a very useful opamp for dac I/V and or differential summing. Jul 30, 2021 · If I could also request test of: OPA1642 ~ 2 Euro OPA1656 ~ 2. It has the most stable input capacitance vs. I had read it many times before posting this threat. Strange but found too many times to ignore it. Mar 22, 2022 · These are probably among the two highest of the best sounding dual opamps around today. I initially saw both the low input impedance and the signal inversion as potential drawbacks. Last edited: 2020-10-05 9:04 pm More options May 3, 2022 · Its not immediately clear what would upgrade NJM4580 which is already quite low noise. Much smaller caps work fine with LM6172 because of its phenomenal slew rate. Apr 16, 2021 · I wonder if the OPA1612 are like this: Fake OPA1612 from China I have done similar small test batches and examination of some other components such as solid polymer capacitors, polypropylene capacitors and certain difficult to obtain very low noise transistors. I payed 6. With a low price and nevertheless minimum THD. With the OPA1612 there is also a bias current, which can be either polarity, implying that also in this case base current compensation is used. any opinions if tried any of the new opamps X. May 19, 2017 · OPA2211A/OPA1612 also sound a bit better than LM4562, IMO. 5 metre cable at 33. The AD opamp is more expensive though than the OPA1612. That's 36dB worse than the opa1612, not 50. Also the OPA1612 does have the highest quiescent over the other opamps we're talking about it will be the hottest. My first tests were with an OPA1612 (equivalent to OPA2211) in the instrumentation stage, but I didn't manage to get the circuit ringing free under all circumstances due to sloppy wiring, decoupling and grounding. 6fA @100 Hz), and the voltage noise favors the 627 only slightly (4. Now even 40 MHz / 3 clearly is not < 3 * 8 MHz, so that won't work out without some local feedback across the 1612 to reduce GBW, usually in the form of a small capacitor. 9nV/rtHz broadband voltage noise; 6 fa/rtHz broadband current noise-131 dB THD+N at 1kHz, 600 ohm load, 3. I was wondering if the OPA2604's could be replace with a dual opamp like the OPA1612 with similar or hopefully better results than the OPA627's May 8, 2022 · I am not certain that would be an good idea: The MJM4558 should have a gain-bandwidth of 3MHz whereas the OPA1612 has 40-80 MHz (depending on amplification). Nov 2, 2010 · Try a pull-down load to the negative supply rail to force the NE5532 into class A, just a few mA will really make it sound better. At a gain of 60dB, the THAT is only down to -82dB. common mode voltage that I've measured on any op amp. Use your ears to listen to music not as an analyzer. Aug 28, 2009 · In comparing the spec sheets of OPA627B and ADA4627B-1, the current noise specs are identical (1. Benefit is lower dc offset and less distortion also high open loop gain also superior stability. You can take RT6863S, a very cheap Chinese opamp(1/3 of opa1612 cost) with very high symmetry of the input stage, and in that case, you'll see <150-160db H2. Ordered the eval module to get a head start*. Feb 28, 2022 · For some reason the OPA1612 seems to have a very similar noise voltage with a 1 Mohm source resistance, but in this case the current noise is specified as 1. Also intend using Opa1612 for buffer ,inverting unity gain voltage follower. 7 EUR at Mouser. 006% Speaker Impedance Compatibility: 2-8Ω Rated Power Output: With 48V/5A PSU Stereo: 180Wx2 @4Ω Mono: 235Wx1 @4Ω With 32V/5A PSU Stereo: 95Wx2 @4Ω Mono: 110Wx1 @4Ω Frequency Response: 20Hz Jun 26, 2023 · The THS3112 is of the same era as the TPA6120A2 (or its progenitor the THS6012 rather), and comes in a hair below 5mA on a dual 15V supply. I've had an OPA1612 lose its mind in a filter circuit where an LME49720 worked just fine. While improving on the flaws, some of the IC's SMD legs gave up and broke off. It appears that the OPA1611/2 have a lower noise voltage, wider bandwidth and higher slew rate than the OPA134 and OPA2134's. 0Amplifier Chip: Texas Instruments TPA3255 SINAD: 89dBSNR: ≥106dB Dynamic Range: ≥106dB THD: <0. 8Vrms and remeasured the range -15dbfs. It turned out that these OPA1612 are cheap TL082 FET Opamps as you can see on the photos. I changed to LM6172 and also reduced the size of the caps in the feedback loop. 5 V) tends to be run inverting anyway since common-mode input range would be pathetic otherwise. 5nv/6. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 1. Dec 11, 2018 · My plan is to use a PCM2707C for USB to I2S converstion, a PCM1794A will be used as the DAC and the amplifier stage will contain a pair of OPA1612 and a OPA1622. Use a simple resistor, or a J-fet with the IDSS trimmed to 3mA~5mA. Apr 7, 2019 · And video amps in general don't have great specs for audio, they have great specs for video. So i expected to get fakes but i wanted to know it for shure. IMO, the ADA4627-1 has a fuller, more "musical", sound than the somewhat thin/sterile LM4562, whilst still retaining nicely detailed highs, and remains my favorite sounding op amp to date. It's best use as an alternative to opa1612 when noise is not a big concern. same opamp either way . 6) Output XLR balanced, ideally if with a big-good permalloy trafo. Tangent didn't mention AD826 and LT1364, which are my best choices. Yes, it's a very subjective question, so what I am looking is the highest class of sound -- In my opinion, also as said by Tangent, the openness and the cleaness of OPA627/37 put them into a higher league that OPA2604 and LT1364, both of which are very Apr 28, 2023 · Correct different suffix 1612 is a 1612 they all link to the same datasheet its kinda comical to say a equivalent for a 1612 is a 1612 likely why the original suffix was chosen for the lower cost you would likely need to ask TI the difference. Mar 27, 2024 · The AD797 is specialized to low impedance work in the 10R to 1k impedance range, its not a general all-round performer (mainly let down by its price and current noise) It was designed for sonar hydrophones I believe, for general audio work the OPA1612 is probably a more capable low-voltage-noise part as its rail-to-rail and far cheaper as its Jul 4, 2021 · The article linked below isn't the be-all and end-all on op amps tests, but very informative. Jan 26, 2024 · The specifications are as follows: Channel: 2. Source impedance, inverted or not, rail voltage, ad nauseum specs. If you pick out something different to try, make sure the mfg doesn't recommend 'no-socket' mounting. Opa1656 has good phase response at high frequency. Apr 18, 2020 · TI continues to surprise us with top notch products. Aug 22, 2009 · With all this talk of DC specs, it's interesting to note that the OPA1611 equals or exceeds the LM4562 in everything except bias current. Swapping might (not "will") cause oscillation as the PCB and decoupling designed for the slow '4558 may not be up to the task with the much faster '1612. I use Rcore transformer and LT1674 to main 5v, then LT1674 on mainboard to main 3. Dec 30, 2022 · Instead of asking for the good opamp, I think it's better to ask for opamps specs that are important in audio. For a lot of these op amps, the parameters which fall out of spec may not make a hill of beans difference in an audio circuit, but make them useless for instrumentation. I'm using the OPA1612 dual opamp in a commercial design. Harmonic distortion <0. Feb 25, 2011 · These I want to replace first. Now I grant you, price is not an indictor if it is the best choice. What do you think will be the opa1612 distortion now that the available amount of feedback at 1khz has lost 60db ? ••• May 8, 2011 · Speed is an issue, though. No hump at all and IMD of two devices together looks quite low, at least 3 times better vs DIY 9038PRO(which is 12x times more expensive vs 9038Q2M) ;) I have to Mar 17, 2019 · TI's SoundPlus opamp family are astonishingly superb designs. ••• Jul 24, 2012 · I have the Essence ST, same DAC circuitry as STX I believe. Current noise performance is pretty much irrelevant too for video as the impedance is 75 ohms everywhere. But I can still easily hook up the buffer board, for something to do when I'm bored. Jul 5, 2006 · Personally I prefer LM4562, OPA2228 and OPA1612 over OPA1642 because of the input noise that makes it sound less pristine. 5mA max Jun 5, 2023 · Just because they are not fake doesn’t mean they’re ”good” - they may be fall outs that don’t meet spec. Jul 5, 2006 · Since CMOS parts tend to top out at a mere 5. He does test the TL072 against some more modern ones, but not the OPA1612 due to there being no DIP version I think. Dec 25, 2019 · Mike just answered an email I sent him regarding the quality of the stock Purifi input board. Nov 22, 2021 · If phase is correct about your original op-amps being rebadged LT1057s, the change to OPA2132 may bring little joy: The 1057s are 4 - 6 dB quieter and more accurate, if you believe the PDF specs. Jan 10, 2016 · He talked to me about OPA1611's versus OPA134's as well as the OPA1612's versus OPA2134's. Nov 2, 2018 · Many of us experimenting with many different power amplifiers run into the problem of needing a pre-amp for test that can handle all power amplifiers concerning input level and impedance. (If I am not wrong OPA1656 is a really modern OP Amps from March 2019 vs 2017 for the OPA1692). After the OPA1656 I 'discovered' the OPA1637. The plan is to build the amplifier stage directly as described by TI in their reference design tidu672c Voltage conversion for the PCM2707 and PCM1794 will be done by two LP5907 Oct 29, 2009 · The LM833 has very similar datasheet specs to an NE5532 (the 833 is a little quieter, the 5532 a little faster). Real low-voltage stuff (think 1. People have a tendency to overestimate their hearing capabilities. The bottom line is that different markets need different specs and companies optimize products to match the market. I opened one SO-8 package and put it under the microscope in our workshop. . 1nV/root Hz at 1kHz with a 10Hz 1/f corner and will cheerfully drive 600 ohms. Jul 26, 2020 · 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. ADA4625-1/2 are supposed to be even better than the ADA4627-1, though I've yet to try them. I wanted to know but I believe people rank it keeping either AD815 or OPA627 as top ranked but i think we need to rank something in second or third as well. 50 cents or 5 bucks, Cheap. lyhue lfyfgfcy mtclza gdpce xjqydsy lqvm ntvw ehbk gozkrf amyzc