Opa1612 diyaudio

Opa1612 diyaudio. Oct 8, 2001 · My choice would be OPA1612 oder ADA4898-2. Jan 30, 2019 · So, first thing I wanted to try is to upgrade the opamp in the LPF. If a transient causes the op amp inputs to be pulled apart, the differential input voltage forward-biases those diodes causing a large input bias current. 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. but if you make a replacement part that originally contains opa1612 and people pay for it, it would be not good for your rep if you use fake parts to save a buck. ••• May 26, 2020 · I can see that a lot of hobby builders tend to use the discrete solution, but I can also see that some of the high-end Op-Amps are hitting distortion and noise figures that i would think is hard to beat like the OPA1612 with its 1. Dec 18, 2020 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. 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. But in general once you give these opamps +-15V then they can output about +-14. Low output current would mean the transimpedance gain of the I/V circuit will be high, and the input current noise of the op amp will be a significant contributor. Feb 11, 2021 · The next op-amp I am planning to try is the OPA1612 but perhaps the DAC is the limiting factor and perhaps the measurements will look very similar to the OPA2134 even if the OPA1612 is a really good op-amp. What do you think will be the opa1612 distortion now that the available amount of feedback at 1khz has lost 60db ? ••• Jul 5, 2006 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. I'm at the first hurdle, finding accurate footprints/models to Sep 14, 2021 · This leads me to believe there could be an issue caused by the back-to-back diodes across the inputs of bipolar (LME49990, OPA1612) and CMOS op amps (OPA1656). Last edited: 2023-12-08 8:51 am. 80 EUR for all ten. Standard opamp for that has pretty much become OPA1612. 10 kOhm - 10 MOhm Set 1 produces no visual deviation at all. I initially saw both the low input impedance and the signal inversion as potential drawbacks. If you use a modern audio opamp, such as the LM4562/LME49720, OPA1612, OPA1656, etc Aug 1, 2024 · And when I was making a Whammy headamp, I got by far the best sound with the Muses 02. However I am considering a new DAC and its IV stage (low current output) and I am looking at OPA1656 (fet input is an advantage) My question is , what do you consider the most important parameters on IV convertors , slew rate , settling time , bandwidth. Replace the OPA1612 with the rediculously pricey Sparkos SS3602 (690 RMB €80). the opa1612 will work on an adapter, but the only dip adapters ive seen with 1622 and 1688 on ebay have been stupidly expensive and dont have Apr 7, 2019 · Unpopular opinion- If you are talking about measured performance in the audio band, it probably is OPA1612 or LME49720. So i expected to get fakes but i wanted to know it for shure. If you're comfortable desoldering soic8 opamps, you can consider swapping opamps but I wouldn't suggest it. Dec 25, 2019 · The OPA1612 may be strained close to its limit, but the LME479xx family exists even in a variant that can output 100mA. Apr 15, 2023 · The 4 x fake OPA1612 in another identical one sound even better, surprsingly good in fact, but they required that I make tiny heat sinks for them because they run so hot. Mar 17, 2019 · For a DAC chip with a low output current, I would suggest op amps with FET type inputs, either JFETs or CMOS. Mar 25, 2021 · which dac chip are you using? the board says its for 9018/28 and 38 lol. 3 MHz. (If I am not wrong OPA1656 is a really modern OP Amps from March 2019 vs 2017 for the OPA1692). 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. 5 V) tends to be run inverting anyway since common-mode input range would be pathetic otherwise. 15ppm, intermodulation way below that, 1. I have diyinhk es9038pro board and try muses8920 for i/v and LPF. Dec 8, 2023 · All diyAudio rules about conduct apply and will be enforced. 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. For the case of Mar 17, 2019 · But for MC phono pre-amps a low noise bipolar input op amp like the OPA1612 would give the best noise performance. Aug 22, 2009 · I just noticed today on the TI web site that the OPA1611 (single) and OPA1612 are finally reality. A couple of things surprised me a bit. Real low-voltage stuff (think 1. Jan 6, 2010 · I have an Onix XCD-99 which is basically a Music Hall CD-25. In your simulations you seem to use a purely resistive load (32 ohm). Unfornately the 64 bit version crashes all the time after some time of simulation, I can not use it, and that was also the case past year, so I did replace the 32 bit version again and that works oke, reason I do not now, maybe mailing the writer of the May 19, 2004 · Temporary conclusion may be OPA1612 for Springsteen and OPA2134 for Pinnock. I Mar 22, 2022 · These are probably among the two highest of the best sounding dual opamps around today. The new national opamps are also there with extreme slew rate of 1900v/usec just like AD815. 8 or 2. 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 Dec 11, 2018 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. Jun 5, 2023 · true, whole opamp rolling community is all hoax and no one can actually tell them apart by hearing. I'd like to have a crack at making a decent DAC to level up my elec skills. Sound is very good, especialy a voice but sometimes I hear a little distortions. 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. 2021-07-22 2:23 pm #2,481 2021-07-22 2:23 pm NJM2068 is installed and I have some OPA2134 and OPA1612 available. 5 V - single supply - I would not be surprised to find some common-mode issues. 000015% THD or the OPA1642 if JFET is the way to go. Feb 17, 2023 · The OPA1622 is a slow device compared to the OPA1612/OPA1656. Opa1656 has good phase response at high frequency. PCM1794, OPA1612 . Thanks for the information on "running hotter". While improving on the flaws, some of the IC's SMD legs gave up and broke off. 1 kOhm - 1 MOhm 4). IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. Mar 17, 2019 · Hi John I used previously in IV convertor (current DAC) the OPA1612 with good tested results . I repeated measurements a few times, using sets of resistors: 1). 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. I went through several iterations and settled on JFET buffers to raise the input impedance. 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. LME49720 sound is boringand too light. I'm not sure on the output current. OPA1656 sounded worst, Muses 8920 sounded best. Benefit is lower dc offset and less distortion also high open loop gain also superior stability. Nov 17, 2017 · Probably better to use OPA1612 anyway, less sensitive to RF and may sound a little better too. In that case, for example, the Sparkos SS3602 sounded very sharp, the OPA1612 oscillated like crazy, and the OPA2604 and TL072 were very dark sounding. I've seen mention of these on various threads in this and other forums. Mar 17, 2019 · TI's SoundPlus opamp family are astonishingly superb designs. SQ was about the same as other ESS-based dacs in that class. It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. 8 bucks for a genuine part. 7 EUR at Mouser. Also the OPA1612 does have the highest quiescent over the other opamps we're talking about it will be the hottest. Diy DAC/amp with PCM2707 Jul 4, 2021 · Go for the opa1612 given the choice. the pcb also only has DIP8 opamp type placement and this is not compatible with opa1622 or opa1688. I don't care about listening tests or something else, just want to use the technical better one in my amp. It appears that the OPA1611/2 have a lower noise voltage, wider bandwidth and higher slew rate than the OPA134 and OPA2134's. He’s optimized the distortion for the OPA1612 into the TPA6120A2 for lowest distortion and that’s not what I’m about. I must test muses now. Cheers, Greg ••• Jul 4, 2021 · Sounds like you need some sort of EQ system to get the effect you want, opamps just all work the same, some are a bit noisier, some have higher distortion, but they don't do florid adjectives, just reproduce a signal to a high accuracy (if all is working well). Without scoping the outputs or measuring the DAC there's no telling if Jul 5, 2006 · IIUC the folks at Sparkos designed the board for Allo or they collaborated on it. It might require more capacitance in the LPF of the I/V stage to keep it happy Vs the others. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: ESS Hump revisited // Humpify -- apply "ESS hump"-style distortions to audio files. OPA1612, OPA2211, LME49720HA, OPA2111, AD746 (class A), AD8620, AD8066, Feb 11, 2021 · As Mark pointed out OPA1612 is a terrific sounding opamp and if you have problems with its bold mighty extreme low bass performance or with the extreme high resolution and unfiltered highs you can use other new opamps with a more gentle sound like OPA2209, OPA2189 etc. 10 Ohm - 10 kOhm, 2). I'm hoping this community could be of help. At a gain of 60dB, the THAT is only down to -82dB. 1nV/root Hz at 1kHz with a 10Hz 1/f corner and will cheerfully drive 600 ohms. 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. TI/Burr Brown's OPA2604 is a good alternative as well. Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). 5V continuously, and since +-10V is sufficient to drive the Purifi modules at their max output (which they cannot do continuously, mind you), I May 4, 2016 · I’ve been following the thread "New Audio Op Amp - OPA1622" for a while and at some point decided to make myself a new universal buffer/headamp based on the OPA1622. They are ~6. Generating higher levels of H2 would be fun. May 19, 2017 · An OPA1612 has slightly better specs than an LM4562---less noise and distortion, faster, and more output voltage swing. Jul 5, 2006 · The OPA1612 is very detailed and quite clinical sounding. Aug 24, 2012 · hi i wanted to know if anybody have used the above opamps. Jan 6, 2020 · Hi Michael, I have read your interesting article in the March 2021 edition of AudioXpress. Joined 2011. OPA1612 sounds better than any transistor preamp I've ever heard and better then my own 6N6P 2 case -no barrels hold- 36kg monster preamp with a 100% double blind test win rate. But, for me, I simply don’t care for monolithic OPAs. But I still have two AB tests going on between the two, eagerly awaiting the results Feb 17, 2023 · Hello, guys. i expected them to put some 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. Maybe it's too soon for anyone to have obtained and evaluated samples, but -- well -- has anyone yet? May 15, 2022 · Now i tested opa1612 with lme49720 and 1612 is better in my opinion. 000 (DIY!) tube preamp with tube Jul 30, 2021 · If I could also request test of: OPA1642 ~ 2 Euro OPA1656 ~ 2. edit: looking closer at the pics, the I/V resistors are 390R (about half the datasheet values, which makes sense as they 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. 1nV/sqrt(Hz) and 0. 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. BTW, last year I crippled my €4. Home. Remember, to actually hit the specified slew rate of an op amp, you have to create a large enough voltage between the op amp inputs to direct 100% of the tail current into the compensation capacitor. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 1. I opened one SO-8 package and put it under the microscope in our workshop. I payed 6. Oct 7, 2020 · Hi :) I've a bit of experience with Altium Designer, C/PP, general MCU stuff, things like I2C and so on. Jan 26, 2012 · 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. Now I use OPA1612 for i/v and LPF, distortion is gone but sound is flat. Jan 10, 2016 · He talked to me about OPA1611's versus OPA134's as well as the OPA1612's versus OPA2134's. Something like that. 100 Ohm - 100 kOhm, 3). Dec 11, 2019 · It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211. But that does not say anything about the SQ. Paid Member. 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. This doesn't look like a high quality pcb and it would be easy to lift traces. . FBUltra Under development, composite OPA1612 and LM3886 design. There is a plot of closed loop gain to Dec 12, 2019 · It would most likely be +/-15V (30V total). Yes, I know everyone likes to think you need GHz op-amps for I/V. Last edited: 2020-10-05 9:04 pm More options Mar 17, 2019 · Voltage noise is higher on 1656 at low frequency til 1khz. Be mindful that the OPA2228 is a little unstable if the gain is lower than 5 with non-resistive loads but I seem to be able to use it to replace other opamps in many occasions. It could sound pretty good, but one could get sound just as good from IC opamp designs. I won't know for sure until Mark reveals the opamp device identifications. That little DAC sounds great now, after adding heat sinks and running it through my Furman PL-8C power filter. I'm using the OPA1612 dual opamp in a commercial design. Members Market Swap Meet Group Buys. OPA1612 May 8, 2011 · Speed is an issue, though. Jan 14, 2019 · I bought 10 OPA1612 from a chinese ebay seller. Jan 19, 2023 · - 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 very fast opamp but therefore it is easy to get it stable Apr 26, 2018 · Comparing it to the OPA1612, I may be hearing the difference between the OPA1612's bipolar inputs and either JFET or FET inputs in the YELLOW device. That's 36dB worse than the opa1612, not 50. The idea is to use it as an output buffer for my standalone volume controller/source selector with the direct headphones drive capability. Aug 15, 2014 · Wel I have tryed th model OPA1612 and it works in the 64 bit version, but not in 32 bit version, I get just offset and no amplifing effect. Jul 5, 2006 · Since CMOS parts tend to top out at a mere 5. It turned out that these OPA1612 are cheap TL082 FET Opamps as you can see on the photos. It's best use as an alternative to opa1612 when noise is not a big concern. At this point noise and ultra low noise supplies might be the last area I should put more effort into for this interface. Mar 17, 2019 · And I would bet that the amplitude of each step is too small to actually reach the slew rate of the amplifier. Although, I have to think that all of our hard work achieving ultra low noise in phono preamps goes out the window as soon as the needle touches the vinyl, and circuit noise is swamped by mechanical noise in the system. It enabled the use of better components (actual measured performance) that otherwise Jun 5, 2023 · 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. But I would have to convert the SOP8 socket to DIP8 first with limited space. Also they are very hot. these chips all have different requirements, so this board is a bit dubious. 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). Harmonic distortion <0. Dual AD797 AVCC regulators might be slightly better yet, and can also be used for ES9028PRO. 5 metre cable at 33. Nov 2, 2018 · I am trying to wrap my head around the preference for DAC >>> OPA1612 >>> HPA1 versus DAC >>> OPA1612 >>> TPA6120 or even DAC >>> OPA1612 >>> LJM HPA2 PRO (With Parallel 4x OPA1612) Right now I am going back and forth between the TPA6120 and the LJM HPA2 PRO (With 4x Parallel op-amps). 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%). May 9, 2023 · Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. 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. It has a strong output stage as well as JFET inputs. I didn't investigate further, and I didn't have the OPA1656 nor the 1642 to try. Also, you can try to select from 5-7pcs of OPA1612 the best one, and you'll see <-150db. CMRR is not a big issue. 9038 recomendation is OPA1612, OPA1656 May 10, 2022 · You don't have to use SA, distortion level obvious on oscilloscope screen. I've done more research and actually have decided against the 2211 and will be using the opa1612 instead for the following reasons: - opa1612 supports 45ma full output current (which could be useful since it's an output buffer stage driving unknown amplifier impedance Jan 6, 2020 · So, you try different devices and measure. My workshop is for fun and not to produce a product. In addition, another possible consideration is with the opamp VCC- connected to ground, then the opamps are running with inputs and outputs offset to within 3 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. 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). Sound is more "color", and "massive". What's not to like with that, and all the other SoundPlus family? Craig ••• Feb 11, 2021 · According to the TI datasheets OPA1612 has less noise than OPA1656. Oct 29, 2009 · diyAudio Donor. Wouldn't it be necessary to check the stability with a complex load, at least with a capaci 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. 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. asjvv ouju xnlxmz zysvmqel yckcqcdr pxwp uunar iewaj pkl otcu