Opa1612 diyaudio specs reddit. 0mA typical supply current, 4. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. 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. 1nv). The AD opamp is more expensive though than the OPA1612. 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. 80 EUR for all ten. ••• Jul 24, 2012 · I have the Essence ST, same DAC circuitry as STX I believe. 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. There are JRC4580 opamps on the TRS inputs and 4 JRC4580 opamps on the 4 main speaker outputs. Some will point out the OPA1612 (which is even better) or the OPA1656. I'm using the OPA1612 dual opamp in a commercial design. 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. Now I grant you, price is not an indictor if it is the best choice. 7 pA/sqrt(Hz), which fits better with the curve. I had read it many times before posting this threat. Jan 24, 2020 · Have you also considered other opamps for output stage. I've had an OPA1612 lose its mind in a filter circuit where an LME49720 worked just fine. 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. The LME49860 is another option. common mode voltage that I've measured on any op amp. ••• 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. The PSRR, CMRR, distortion, bias current, offsets will all be pretty lacklustre as the amp is designed to slew ultra-fast above all else. Ordered the eval module to get a head start*. 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. At least it is my preference when associated with an AK-449x DAC. It appears that the OPA1611/2 have a lower noise voltage, wider bandwidth and higher slew rate than the OPA134 and OPA2134's. 1nV/root Hz at 1kHz with a 10Hz 1/f corner and will cheerfully drive 600 ohms. 8Vrms and remeasured the range -15dbfs. 0Amplifier Chip: Texas Instruments TPA3255 SINAD: 89dBSNR: ≥106dB Dynamic Range: ≥106dB THD: <0. 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. 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. It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. 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). 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 1. It turned out that these OPA1612 are cheap TL082 FET Opamps as you can see on the photos. I initially saw both the low input impedance and the signal inversion as potential drawbacks. 50 cents or 5 bucks, Cheap. I changed to LM6172 and also reduced the size of the caps in the feedback loop. Mar 22, 2022 · These are probably among the two highest of the best sounding dual opamps around today. A fully differential amplifier with excellent audio specs. The 4627 is faster the the 627 (82v/uSec vs. 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. He does test the TL072 against some more modern ones, but not the OPA1612 due to there being no DIP version I think. 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). I use Rcore transformer and LT1674 to main 5v, then LT1674 on mainboard to main 3. If you pick out something different to try, make sure the mfg doesn't recommend 'no-socket' mounting. 3 MHz. 5 V) tends to be run inverting anyway since common-mode input range would be pathetic otherwise. 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. Jul 5, 2006 · Since CMOS parts tend to top out at a mere 5. Jan 26, 2024 · The specifications are as follows: Channel: 2. 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. For the case of Jan 6, 2010 · I have an Onix XCD-99 which is basically a Music Hall CD-25. CMRR is not a big issue. It has the most stable input capacitance vs. 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. 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. Apr 7, 2019 · And video amps in general don't have great specs for audio, they have great specs for video. 6fA @100 Hz), and the voltage noise favors the 627 only slightly (4. -60dbfs. People have a tendency to overestimate their hearing capabilities. any opinions if tried any of the new opamps X. 3v components, ltc6655 and opa1612 for AVCC and VREF, tps65131 +-15v and low voltage through LM317/337. 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. 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. 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. Source impedance, inverted or not, rail voltage, ad nauseum specs. With a low price and nevertheless minimum THD. 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. Jul 30, 2021 · If I could also request test of: OPA1642 ~ 2 Euro OPA1656 ~ 2. 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. Mar 17, 2019 · Voltage noise is higher on 1656 at low frequency til 1khz. Opa1656 has good phase response at high frequency. (If I am not wrong OPA1656 is a really modern OP Amps from March 2019 vs 2017 for the OPA1692). Harmonic distortion <0. Current noise performance is pretty much irrelevant too for video as the impedance is 75 ohms everywhere. 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. 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. 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. 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. I opened one SO-8 package and put it under the microscope in our workshop. I noticed a low-cost headphone amplifier board based on Mar 17, 2019 · The OPA1641 would be slightly better. Strange but found too many times to ignore it. Feb 25, 2011 · These I want to replace first. 9nV/rtHz broadband voltage noise; 6 fa/rtHz broadband current noise-131 dB THD+N at 1kHz, 600 ohm load, 3. 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. OPA1656 sounded worst, Muses 8920 sounded best. 5Vrms signal, 80-kHz measurement bandwidth; 53 MHz gain bandwidth product, 24V/us slew rate >100mA output current; 4. Benefit is lower dc offset and less distortion also high open loop gain also superior stability. The higher current drive of the OPA2822 would be beneficial. 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). There are gain-of-8 specs, with an optimal Rf being 200R. 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. same opamp either way . They are ~6. Use your ears to listen to music not as an analyzer. 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. Use a simple resistor, or a J-fet with the IDSS trimmed to 3mA~5mA. 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. 5nv/6. May 19, 2017 · OPA2211A/OPA1612 also sound a bit better than LM4562, IMO. 5mA max May 15, 2022 · Buggle2 Riaa board. 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. 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. 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). 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. This combination will sound slightly more clinical than the OPA2228/OPA2822 combination. <edit> As for why people say FET input sounds better - its most probably about RF immunity of the LTP input. 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. Jul 5, 2006 · Personally I prefer LM4562, OPA2228 and OPA1612 over OPA1642 because of the input noise that makes it sound less pristine. 15ppm, intermodulation way below that, 1. It might require more capacitance in the LPF of the I/V stage to keep it happy Vs the others. ADA4625-1/2 are supposed to be even better than the ADA4627-1, though I've yet to try them. OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. TL074 is easily surpassed by OPA1644, that's a no-brainer. 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. Jan 14, 2019 · I bought 10 OPA1612 from a chinese ebay seller. Aug 28, 2009 · In comparing the spec sheets of OPA627B and ADA4627B-1, the current noise specs are identical (1. Dec 25, 2019 · Mike just answered an email I sent him regarding the quality of the stock Purifi input board. 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. Also the OPA1612 does have the highest quiescent over the other opamps we're talking about it will be the hottest. Jan 10, 2016 · He talked to me about OPA1611's versus OPA134's as well as the OPA1612's versus OPA2134's. He gives strong recommendations for some applications and also caveats about ill-informed op amp rolling. 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. Also intend using Opa1612 for buffer ,inverting unity gain voltage follower. Much smaller caps work fine with LM6172 because of its phenomenal slew rate. I’m guessing a gain of 10 would necessitate an Rf in the 150R-180R range. While improving on the flaws, some of the IC's SMD legs gave up and broke off. 7 EUR at Mouser. 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. 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. That's 36dB worse than the opa1612, not 50. 5 V - single supply - I would not be surprised to find some common-mode issues. I hesitate to recommend those without simulating the circuit. 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. 55), but in inverting mode only. Mar 9, 2023 · OPA1612 can easily supply 30mA so loads above 150ohm are fine. Feb 17, 2023 · I'd go with the LM4562 (= LME49720) instead. I will only tell the fourth Jan 5, 2020 · I did replace OPA1612 for OPA1656, and also switched ADC input range for the 1. But I can still easily hook up the buffer board, for something to do when I'm bored. 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. Nov 17, 2017 · Hi, after a while i decided to make a dual mono DAC board es9038q2m. 8 or 2. 3v for oscillator and other 3. Apr 18, 2020 · TI continues to surprise us with top notch products. If you understand how to choose an opamp's based on requirements, you will be able to do so for many other parts. MUSES8820 is the best, IMHO. So i expected to get fakes but i wanted to know it for shure. Tested a lot of OP, including LME49720, OPA1612, OPA1642, MUSES8920 and MUSES8820. 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. It's best use as an alternative to opa1612 when noise is not a big concern. Mar 17, 2019 · A quick snapshot of the OPA1656 performance specs: 2. ••• Feb 17, 2023 · The OPA1622 is a slow device compared to the OPA1612/OPA1656. . 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. Lots of high performance models hate sockets. 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. I payed 6. After the OPA1656 I 'discovered' the OPA1637. 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. The bottom line is that different markets need different specs and companies optimize products to match the market. 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. Tangent didn't mention AD826 and LT1364, which are my best choices. 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%). Real low-voltage stuff (think 1. Gain stage combined with LPF 50-80kHz, OPA1612 probably composite but not necessary yet. 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. 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. Aug 24, 2012 · The new national opamps are also there with extreme slew rate of 1900v/usec just like AD815. Jun 5, 2023 · Although specifications of OPA1612 (bipolar) indicate they are superior to that of OPA1642 (JFET inputs) in practice OPA1642 performs slightly better. 6) Output XLR balanced, ideally if with a big-good permalloy trafo. 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. 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. 5 metre cable at 33. 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. I went through several iterations and settled on JFET buffers to raise the input impedance. You can also try OPA1612 as buffer with OPA2822 for the headphone driver. Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). At a gain of 60dB, the THAT is only down to -82dB. 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. ppv ndrtwjava uujdp bgdyrd ndlvot toitt mkqbg ungsxp tiyxa qlihl
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