Opa1612 review forum. Or, why not, a composite opamp, OPA1612+. Most DACs after 2019 are using opa1612 or opa1622. The OPA2210 is a jewel ! I tested the OPA1622, OPA1612, OPA1656, OPA1692 The OPA2210 definitely worth trying as I said before ! (I sent a pair to another forum member to get his opinion as well) In any case, do not embark on this adventure without having good welding skills. Oct 12, 2022 · OPA1612 is too weak for 10mA current. The owner then ordered a set of Sparkos Pro SS2590 discrete opamps. It is equipped with Neutrik XLR connectors and gold-plated 5-way speaker binding posts. OPA627 is really bass forward but you lose details, clarity and energy. Feb 13, 2016 · Recently I reviewed the Nord Three SE 1ET400A Dual Mono Stereo Amplifier. Each channel has 4 outputs summoned, thus lowering the already really low noise by around -6 dB. I felt a great improvement overall. On some of the newr parts TI has released measurements of the EMI immunity, e. You retrieve so much details and trebble extension but could be a bit fatiguing. Joined Oct Oct 25, 2018 · I've designed a headphone amplifier using OPA1612 as a gain stage and using OPA1622 as output buffers. They probably used the stock resistors values too, which are too low for the tl072 to work comfortably. Taking a lead form "rolling" tubes in tube products, a trend has started in replacing op-amps -- sometimes with much difficulty -- to improve performance of solid state products like DACs. The TI OPA1612 dual operational amplifier benefits from excellent technical characteristics, allowing very good electrical and audio performance. Feb 11, 2021 · 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. Thank you Apr 6, 2020 · The OPA2134 is very ordinary, I consider it a side step to the NE5532. The output switch chip in the DAC is damaged, which disconnects the output of the LPF op-amp from the TRS socket. I must test muses now. It's just extra $10 for 3 opa1612. The volume control relay matrix, I am not sure how it works as hybrid but it reduce the numbers of relay and resister. I would recommend trying opa1612 for people who havnt had a thought about it. Parameter:Chipset: TPA3255+NE5532Replaceable operational amplifier chips: RT3609SM, OPA2604, OPA2134, LM4562, JRC5532, OP275GSZ, OPA1612, MUSES01/02/03 Dec 28, 2018 · There are many reviews of audio hardware and expert members to help answer your Forum Donor. I think FDA amplifier would be better for performance thus I plan to replace OPA163x(OPA1633 or OPA1637) Is it possible to replace OPA1612 to FDA(OPA163x) and is it Other Parts Discussed in Thread: OPA1612, OPA1642, RC4136 I use these amplifiers for pro audio. Regards, Thomas Apr 17, 2021 · The top side 4pcs OPA1612 are I/V converter and those 4pcs Rubycon YXJ 220uF25V are coupling caps on signal. 33ohm. 1-nV/√Hz as well as an extremely low distortion level of 0. Forum Donor. Oct 20, 2020 · There are many reviews of audio hardware and expert AK4118 SPDIF to I2S, ES9023 I2S DACs, DIYINHK ES9016 DAC, OPA1612. It has the most stable input capacitance vs. Attachments Dec 28, 2018 · Questions is the opposite. That should get you going. - Choice is not permanent and can be changed by the customer via internal jumpers at anytime. 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 a boost certainly not exceptional in power. If Topping wants to cut cost, just remove display or use plastic case. If you're comfortable desoldering soic8 opamps, you can consider swapping opamps but I wouldn't suggest it. I hate such ugly clipping behavior(any real opamp of serious manufacturers have an ideal clipping without screeching) and one that fact is enough to me to consider that chip junk. The OPA1612 is used by Topping/SMSL and I believe Gustard is using it too and also in the Latest Topping Preamp that everyone is gossiping about…. Apr 27, 2023 · don't worry, I know a little we are on the basis of 100 dollar dacs on this new entry-level akm and moreover in relation to the tests carried out at the vintage era "pre-serie", wiim had to debug in hardware this version quickly to release a new one version because of real problems in audio. Dec 9, 2019 · Home: RME ADI-2 Pro FS R BE—Neumann KH80 DSP, Arendal Sound 1723 1S Work from Home: JDS Labs Atom—Etymotic ER4SR, AKG K371, Sennheiser HD820 Measurement: Earthworks M30 (Reed R8090)—Earthworks ZDT 1021 — RME ADI-2 Pro FS R BE — REW Jan 10, 2016 · He talked to me about OPA1611's versus OPA134's as well as the OPA1612's versus OPA2134's. Assign an op amp symbol that uses just the 5 pins. I suggest the following reference - 994Enh Discret OpAmp SONIC IMAGERY LABS - SPARKOS LABS SS3606 - AOP 1612 - LM4562 Mar 27, 2023 · - Buckeye buffer stage (OPA1612 OP Amp), allowing for Low/Med/High gain settings via toggle switch on the rear. i swapped the njm2122 opamp with a opa1612 but it doesnt seem to work its pin compatible but it seems like the opa isnt happy with such a low supply voltage. 1ohm or 0. Jun 23, 2020 · A search on the forum would help. 1-nV/√ Hz noise density with an ultralow distortion of 0. Anyway. Aug 22, 2009 · I talked to a TI/B-B applications engineer today. The different players sounded different. Joined Mar 15, 2016 Messages 8,199 e. 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. 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. Dec 11, 2019 · It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211 Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: ESS Hump revisited // Humpify -- apply "ESS hump"-style distortions to audio files I read on several forum the advantage to use specific AOP for the final stage of DAC or Amplifier. Feb 19, 2022 · This is a review and detailed measurements of the Loxjie D40 stereo DAC with Bluetooth and headphone amplifier. - high levels of DC precision are generally not required by audio customers (audio equipment makers). Transparency got way better. Click to expand Aug 24, 2018 · As per moderator, here is full article from the site: Objective Guide to Op-Amp Rolling - Part 1 July 30, 2021 Op-Amp Test Board This blog article/post is a deep dive into currently available 8-pin DIP dual op-amps, for those that like to swap op-amps in their designs and/or DIY projects. And bias current vs common-mode voltage has a slope that adds distortion (H2) when source impedance isn't super low and well balanced while OPA2156 doesn't have that problem (but may have nonlinear capacitance vs CM voltage unless the input stage is bootstrapped like in OPA1642). Apr 26, 2023 · The amplifier boasts several impressive features. This configuration is best for use in setups with a source/DAC capable of higher pre-out voltages. Alex Feb 10, 2024 · Thanks Amir, I was just wondering why the review was taking so long. V6 vivid measured superb tho. Sep 17, 2023 · Tried putting in opa1612 today. add a optional 12V connector (not populated) for some people that need for power LEDs,etc. A few months ago I Dec 17, 2023 · 1. The resistance from the I/V converter is only 350 ohm. Go for the opa1612 given the choice. 000015% at 1 kHz. Extensive listening test showed me that the best sounding result was with the lm4562. 000015% at 1kHz. The Apr 8, 2021 · I tried OPA1622, OPA627 and OPA1612 at I/V stage and OPA1612 is clearly the best to my ears. You can argue that 2068 perform exactly the same as opa2156 but the difference between opa1612 and opa2156 is really big. Dual customzied solution will give unmeasurable distortion (possibly -180db). That unit came with the Sonic Imagery's 990ENH discrete operational amplifier ("opamp") in the buffer stage (pre-amplifier). It could be very interesting to test their performance: - SNR - Bandwish - slew rate-. I don't care about listening tests or something else, just want to use the technical better one in my amp. It is a little bit cleaner and perhaps because of that instruments are more defined in space. The OPA 627 is well over price and is bass heavy and it’s not worth the price you pay for it 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. Frankly, this product has some points in favor but some against it. Apr 21, 2019 · SparkOS Discrete Op-amps SS3601 and SS3602 with comparisons to Ne5532/5534, Muses02, Burson v6 Classic, and Burson v6 Vivid op amps Mar 20, 2018 · And why "almost zero output impedance" when you will have output buffer to lower impedance - which btw is again OPA2134 in D10? Speaking of that, are you familiar that Amir did try rolling the op amps in place of output buffer in D10 and OPA1612 didn't perform any better than OPA2134? Jul 4, 2021 · This looks like a stock implementation of the pcm1794 datasheet output stage. This opamp is not a perfect choice for that task. It is on kind loan from a member and costs US $2,090. Mar 14, 2010 · OPA1612 is fuller sounding - especially lower midrange but also more dynamic. May 15, 2022 · Now i tested opa1612 with lme49720 and 1612 is better in my opinion. It's quite different from previously ESS chip since 9018. So, it is a different design and chip. This opamp could drive 350 ohm better than OPA1612. Sep 11, 2021 · The picture shows my op-amp rolling, I have tried the ne5532, opa1612, lm4562 and opa1642. Jun 7, 2016 · Before writing this review I would like to say many thanks to Mr Charles from Burson Audio for sending me the hybrid op amps for review purposes. This is a forum where guitarists, from novice to experienced, can explore the world of guitar through a variety of media and discussion. Dynamics felt better, bass felt more defined and the upper midrange seems to have more air. Also about component tolerances, i tested a few opa1612 before and today both opa2211 and opa1612 performed just identical. It ensures a very low noise density of 1. 9018 request one reference clock and use internal PLL. If you have guitar related questions, start with the "search" field at the top of the page. I also refurbish large format recording consoles. Bright white LED display is highly responsive as is the rotary The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. In the data sheet of AK4499EXEQ(it is not freely download website), They are using two OPA1612 for I/V conversion each channel. the OPA1612 at ~1 nV/rtHz Jan 26, 2022 · The amp remains totally silent even with its volume at maximum. Joined Jun 16, 2020 Messages The OPA1612 is generally used as IV stage Jan 1, 2019 · Their new Pure Multichannel amplifier is just beautiful! From 7 up to 12 channels of Purifi 1ET400A amps, LT3045/LT3094 regulators, OPA1612 or Sonic Imagery 994 opamps. Nov 30, 2021 · There are many reviews of audio hardware and expert members to help answer your questions. TAITIEN 22M/25M in the center can be switched to DAC. May 28, 2020 · Purifi 1ET6525SA Power Specs: 230w into 8ohm 480w into 4ohm 510w into 2ohm Custom Input Buffer Board w/: - Neutrik XLR connectors - 5-way gold plated binding posts - OPA1612 OP Amp - TI TPS7A30/49 Voltage Regulators - Low, Med, High Gain settings - Clipping Indication (via Front Power LED) - Apr 8, 2021 · There are many reviews of audio hardware and expert Forum Donor. The board is the same, but using different opamps. Therefore, the OPA1612 simulation model really only contains one op amp having the pin order of the single OPA1611 op amp. common mode voltage that I've measured on any op amp. It is hard to get it stable so 1 ohm output resistors are added in each output instead of what i liked 0. 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. Jan 15, 2023 · The pages for the "Hypex NCx500 DM Lux Dual Mono Amplifier" & the "Hypex NCx500 ST Lux Stereo Amplifier" state that they use the OPA1656, but the "OP Amplifier Selection" drop list has the OPA1612 (and the Sonic Imagery and Sparkos options), while the page for the "Hypex NCx500 ST Stereo Amplifier" only mentions the OPA1612. Joined Jan 8, 2019 It's OPA1612 (1pc) + BUF634A (4pcs Jun 20, 2023 · AIYIMA's latest TPA3255 power amplifier has PFFB function and is equipped with 48v5a GAN power supply. Mar 9, 2023 · 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 Mar 22, 2022 · The OPA1612 is one of the best I’ve ever encountered, the LME 49720 are hard to beat at any price……. 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). now lets see and talk about my Audio Gears for testing V5i: with dual to mono adapter somehow I managed to install the 2 V5i Single inside the well known LD I+ hybrid tube amp. I used an oscilloscope to measure the pulse amplitude at the input of the ZE amplifier when the Oct 2, 2021 · I also think that op-amp rolling is rather fun, even if the only op I found to be sounding clearly better than ne5532, was the lm4562 ( the others I tried: opa1642 opa2134 and opa1612 ) Last edited: Oct 2, 2021 Welcome to r/guitar, a community devoted to the exchange of guitar related information. I have them measured ln violectric v200 and gain stage of o2. Thank you Sep 6, 2023 · Tried putting in opa1612 today. Jan 3, 2020 · The OPA1612 is more robust against EMI than the LME49720. The amplifier utilizes an OPA1612 Input Stage and TI TPS7A49/30 Voltage Regulators, which contributes to its strong performance. May 23, 2018 · Opa1656 and opa1612 without tweaking have better performance than almost any discrete solution. . let's start with 789 789 is the original(but cut down) version of thx 888 789: opa1602 + opa564 888: opa1612 + opa564 + flying supply flying supply adds headroom and voltage swing without exceeding the operation maximum of the opamps. Dec 7, 2023 · This is a review and detailed measurements of the VTV Purifi class-D amplifier with the optional Weiss OP2-BA Op-amp (buffer/input gain stage). I like the design -- it reminds me of some European brands. 887 is the upgrade/optimized version of 789 Dec 28, 2018 · Would have been interesting to see how the TI Opa1612 would have performed as well in the custom buffer board. g. The supply voltages are +/-12V and both are capable of supplying up to 1A currents. My statements were verified: - OPA1611/1612 are optimized for better distortion than the OPA211 (already pretty good). Sound is more "color", and "massive". Sep 15, 2018 · This is a study of whether changing op-amps in a DAC makes a measurable difference. It was sent to me by the company and costs US $430. My E50 DAC connected to the input of the 3E amplifier was damaged. May 23, 2018 · The first and obvious conclusion: we must avoid the audiophile Burson Audio V5. Transients are stronger, both rimshots of snare drum and big-band trumpets. Buck cap change to 1500uF/80V/Nichicon due to 1800uF/63V/Rubycon not able to purchase. However, I found D10b sounds terrible with LM4562. Thread starter Forum Donor. Custom Input Buffer Board w/: 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. Dec 7, 2023 · Input Opamp Change to OPA1556,this is due to part unified that we found it perform the same as OPA1612 in another project. Nov 21, 2022 · There are many reviews of audio hardware and expert members to help answer Forum Donor. Mar 17, 2019 · The OPA1641 would be slightly better. 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. Oct 25, 2018 · Neurochrome hp-1 is essentially the same but using opa1612 and paralleled the whole composite amplifier section. 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? Apr 17, 2021 · D90 III used two ES9039SPRO which is more than D90SE with one ES9038 and AVDD5V provided from OPA1612 DAC 1. Soundstage and placement felt more solid. now it is proven that problems linked to power supply problems (observed by onlyoneme) . The right up OP is OPA1612 used to converter as single-end. Just set up your OPA1612 model having using the 5 pins in the order listed - as you would for the OPA1611 single op amp. Currently, I require opamps in the DIP package. Btw the frequency compensation is used according to the designer in order to get it stable. Dec 28, 2018 · OPA1612/2211 has excellent CMRR but PSRR isn't stellar and strictly follows OLG. I can not tell the difference between macbook phone output and DAC+amp. Nov 24, 2018 · right, it's about half the price of opa1612, maybe cheaper, after test those chips I didn't back to bargain, maybe possible to get 1/3-1/4 price. Noise is roughly around 3-4nV. I use TPS7A4700 and TPS7A33 low noise DC to DC converters with 4 µV/16 µV noise. Yes it destroyed many many extreme expensive commercial preamps in the last 25 years. the OPA209 family. At least -120db thd performance. For the future M500, M500MK4, I would like to see OPA1656 instead of OPA1612. This gave me a chance to Dec 26, 2019 · There are many reviews of audio hardware and expert members to help There seems to be so much chatter about the OPA1612, 1656, 1692, 2604, in this thread Feb 22, 2023 · Hello, S=klogW. , or OPA1612+power transistor. theres just no amplification going on. but The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. 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. Last edited: Jun 26, 2023 Even the Voltage noise spectral density curve in the OPA1612 datasheet figure 32 shows lower noise when the source resistance is low. Joined May 2, 2022 #185 Isn't the OPA627 a single channel opamp vs the OPA1612 is dual (so Dec 29, 2021 · It's a sad decision to use LM4562 here. I just reviewed the same amp but with SIL 994EnH-Ticha Pro buffer so you can compare them. May 9, 2023 · Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. LME49720 sound is boringand too light. It appears that the OPA1611/2 have a lower noise voltage, wider bandwidth and higher slew rate than the OPA134 and OPA2134's. 2V came from the D2D IC on the left lower side. Several reference are used on forum. hjbbiq wwkfvw ncus gcgko dwo ycb uinjv vlusdvn gzgt aqejjp