Opa1656 vs opa627 OPA627 and OPA827, combining high speed with high dc precision and ac performance. It depends very much on I would be very interested in hearing opinions on opa1678 versus opa1656, as I'm using both in different products. 1uF ceramic + 10uF Tant bypass, I added a 0. 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 Hello, i just compared my current favourite opamp opa1656 vs the much older opa627 (its a dual module from audiophonics, the IC`s are "used" if this matter but as long they function correctly i only see the benefit of them 3e AUDIO TPA3250 - сравниваем разные ОУ - OPA1656, OPA627, Muses01, Muses02, VV4ЖМИТЕ НА КНОПОЧКУ "СПАСИБО" ДЛЯ СЧАСТЬЯ!!Понравилось Lm4562 DAC chips came with the Cyenne Dac originally, but I found that despite their low THD, they sounded clean, but lean in expression. If a person can hear a difference in electronic circuits, there are tests that can easily measure that difference. I'll update this thread when it's online. Dual customzied solution will give unmeasurable distortion (possibly -180db). 00 ea USD. The high gain makes sure that this difference is driven down to zero, and the high slew rate makes sure that rapid changes of the input can be followed closely. Assuming the voltage noise has a white and a 1/f part, which seems to be correct, for the total RIAA- With the Philips I did hear so much more, better imaging, soundstage, diferentiation between the voice and instruments. For I/V the best one would be the SS V6 (the best from above, not from the market! I find the MUSES01 as being a bit better for I/V), same applies for Low-Pass Filter. 2024-07-15 2:14 am #101 2024-07-15 2:14 am #101 That's why my design (white/ gold) has the thermal pad underneath The advantage of OPA1656 is that it has JFET inputs rather than bipolar, so its input bias current is much lower, making it easier to keep the output DC offset low in some applications. and far reaching that WILL drive a more pleasant sounding “diva” star op amp like the usual suspects AD797 or the Opa627 or But e. พวก opa627 opa2134 muse01/02 muses8820 muses8920 lme49720 ne5532/34 มีอะไรอัพเดท ดีกว่าเบอร์พวกนี้ยังครับ เห็นเล่นกันมาเป็น10ปีแล้ว ฮาๆ Dual Op-Amps (I/V Converter) JRC 2114D There is a nice Teardown of a real vs fake OPA627 on the webs. Maybe biasing the AD8610 will shift it to another Recently I reviewed the Nord Three SE 1ET400A Dual Mono Stereo Amplifier. Parameter-, Bestell- und Qualitätsinformationen finden Verzerrungswerte OPA1655 — SoundPlus™, ein ultraleiser und verzerrungsarmer Burr Manufacturer: Part # Datasheet: Description: Texas Instruments: OPA1656: 3Mb / 38P [Old version datasheet] OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown??Audio Operational Amplifiers DECEMBER 2021: OPA1656: 3Mb / 42P [Old version datasheet] OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers Part #: OPA1656. Those are fine. Even at prices you may think are low, they have decent margins. Nobody remembers Rayteon 4558 since it was designed/used more than 20 years ago. 2013-09-12 9:43 am #3 2013-09-12 9:43 am #3 Dale, To me To you Thank you wholeheartedly Bill PS. If you still want to go with NJM2068 ask this guy about supply voltage since OPA2134 starts at 5 volt minimum while NMJ2068 starts at 8V minimum. Really ? On a new OPA1656 that cost around 0. /Peter . Stability should be considered especially with the wider bandwidth of the OPA1656. It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. Maybe it's 3 um CMOS, or something with special "high voltage" devices. I also really liked the OPA627 that I had in an audio-gd dac years ago. 022uf film foil were only caps in audio path she picked the opa1612 from ne5532 the opa1656 See this and following posts as to why 7kHz + 13kHz is a very good and practical two-tone signal for IMD testing, and probably better than single sine THD (and especially those above 20kHz) and better than 19+20kHz IMD or (199+200kHz for that matter). I always considered the OPA2604 to be a cheap opamp so I went with "better" OPA2132, OPA2228, OPA627, OPA637, etc. I would say that chip amps are definitively op amps (simply in large packages), and one could argue that low-powered op amps are technically chip amps as well because they are amps that are "chips," instead of SS discrete or tubes. 3 V, you would have to do a lot of stacking to get something that survives +/- 15 V. What are the difference between CMOS, Bi Polar, and jfets Op Amp amps sonically? When and where to choose one or the other ? opa627 or ad797 etc. File Size: 3MbKbytes. J. the general sound Part Number: OPA627 Other Parts Discussed in Thread: OPA1656 , OPA1642 I am in the process of restoring and upgrading several pieces of the vintage Kenwood Basic. OPA627 - had to wire pair of these to work as a dual-channel, but by far THD vs. TI’s OPA1656 is a SoundPlus™ ultra-low noise and distortion, Burr-Brown™ audio operational amplifier. That unit came with the Sonic Imagery's 990ENH discrete operational amplifier ("opamp") in the buffer stage (pre-amplifier). 8µV/˚C max drift precision operational amplifier. 27th November 2017 opa627 and opa604. Based on the application I don't believe pulling the extra power will be of concern and the OPA1656 with the lower noise floor is a great choice. Then listen for a while. This is completely in conformance with TI SLAA788A document, Fig. The OPA1642 is “one step down” but still very highly rated, and it is JFET-input which should give a low enough DC-offset to be used directly in this kind of application. For NE55232 there are a lot of suitable voltage, i. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 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. Is there going to be a sonic difference running dual mono when listening to stereo sources? Is dual mono a "purer sound" aka less crosstalk? Going to be running OPA627BP on I have OPA627's on a Stokes SDS class A headphone amplifier, before those i tried lower priced opamps. The OPA627 and OPA637 are almost neutral but they miss one point and that's why I don't like them - they lack PRAT, sound kind of slow, uninvolving, they never make me tap, or bob my head. Should I put some OPA1656 in a metal can and see if anyone wants some the 627 is a fine chip worthy of going down in history as one most pleasing all rounder - many others I have tried wound up being nice and detailed but lacked the warmth of the 627bp - the successor for me was the 1611a (seen below on SOIC-8 to 8-pin DIP) which was used for super sensitive sonar equipment in the early 2010's It shows the PCM1704 interface to the digital filter, the I/V converter, and the DAC post filter. Newk Yuler Active Member. 5 mA/channel, typical. The OPA637 does sound faster, but the OPA627 sounds more natural. Device Information(1) The OPA1656 prelim datasheet and prototype samples should be available on ti. Joined 2008. OPA1656 de TI es amplificador operacional de audio Burr-Brown™ SoundPlus™ con ruido y distorsión ultrabajos. Are There are vast differences between each device quite easily, then heard. They were around $30AU before landing in the country. It depends very much on the circuit if a faster OP can be used. 2001-06-16 7:57 pm #1 2001-06-16 7:57 pm #1 hi everyone, ok i know people have already asked all the questions i'm about to ask Upgrade your audio equipment with the versatile OPA828 integrated circuit op amp, a perfect replacement for opa627, ad797, and NE5534. ±18 V, then the maximum possible signal amplitude is 12. 1-Hz to 10-Hz noise. Encuentre parámetros, información sobre pedidos y calidad µS, alta velocidad, deriva máxima de 0,8 µV/˚C OPA627-DIE — Amplificador operacional de precisión de alta velocidad OPA627-DIE OPA637 OPA627 and OPA827, combining high speed with high dc precision and ac performance. 1 Go to page. rhythmsandy. My feeling is the resolution of 4637 is slightly better,but the major difference is the sense of the instrument locations. Forums. OPA627 is very suited for this purpose. 5V 106 116 100 110 dB OPEN-LOOP GAIN Open-Loop Voltage Gain VO = ±10V, RL = 1kΩ 112 120 106 116 dB Over Specified Temperature VO = ±10V, RL = 1kΩ 106 117 100 110 dB SM Grade VO = ±10V, RL = 1kΩ 100 114 dB FREQUENCY RESPONSE Slew Rate: OPA627 G = –1, 10V Step The Opa1692 is bi polar op amp and Opa1656 is CMOS. According to Tangent's site there's no audible difference Audiophonics is proud to present its OPA line-up with the OPA1656 based on a authentic Texas Instrument chip. Choosing the right audio op amp in different contexts: Parts discussed in this thread: OPA167x, OPAx134, OPA165x, OPA1622, OPA160x, OPA1692, OPA1611, OPA1632, With so many different audio op amps available from TI, it Buggle2 Riaa board. I should get it in For I/V the best one would be the SS V6 (the best from above, not from the market! I find the MUSES01 as being a bit better for I/V), same applies for Low-Pass Filter. I'll try to dig it up sometime soon. 1 Hz to 10 Hz noise. Description: OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers. I was just wondering if some better alternative (price does not matter) has come along the last decade ? However they measure and perform worse than SOTA audio ICs like lme49720, opa1612, opa1656 etc. A singers head is blown up to giant proportions. Actually, 2604 is a little expensive than 2134. But the choices for the tone stack The opa604 is a single channel chip and can be replaced by the opa627, the opa2604 is a dual channel chip and would need to be replaced by 2 of the 627s in an adapter or some other dual channel chip. Sounded like you had a cheap hobby, Motherone ! But i did read you first posting earlier, thank LT1028 vs OPA627 Update Time: Nov 08, 2023 Readership: 1821. I remember listening to Dave Matthews and just tingling with feeling of the presence in the room with the band in a 3d image around him like there was no speakers, just the opa827 vs opa627 Home. Feb 27, 2005 at 9:28 PM. Last edited: 2022-04-21 6:53 am I currently have a topping d10s, and I’m looking into changing out the opamp for something a little higher quality. Mello4. Go. Hi, Could you please tell me the recommended operational amplifiers which are available as the I/V converter and the differential output buffer for PCM1794A? I would be grateful if you could suggest me with an emphasis on sound quality. Regarding the tone stack, if there is enough gain in the front-end, the input-referred noise may not be impacted by the resistances. The signal that drives the op amp is the difference between the op amp output and what you are feeding in. OPA1656, gain-bandwidth product 53 MHz LME49990, 110 MHz OPA1612, 40 MHz Behaving well: OPA2604, 20 MHz OPA627, 16 MHz OPA2107, 4. Operational amplifiers (op-amps) are foundational components in the world of electronics, serving as the building blocks for a wide range of applications, from There's a thread on DIYaudio about the OPA1656, with a guy from TI telling very useful things. So I have heard about replacement by OPA627, and OPA637, have some originals from ti . Joined 2021. The AD847s that Rotel suggests and sells cost $17. Others than that, the OPA627 can deliver the same richness, same sound-stage and same detail as the OPA1622 does. OPA627 vs. Joined 2001. It has the most stable input capacitance vs. I was thinking of putting in the OPA627 that I used in my Toshiba3960 mod but if there is an even better opamp, I would prefer to use that. 1; 2; First Prev 2 of 2 Go to page. I hear OPA828 is the new version of the OPA627, so I may try that one out. Find parameters, ordering and quality information (250 mA) precision operational amplifier OPA627 36-V, 1-MHz operational amplifier with rail-to-rail input to V+ OPA141 Hi since end of the 90's the OPA627 has been a very good audio grade operational amplifier. I don't know what issues are impacting your existing op amp but what makes you believe the OPa627S won't suffer the same malady that afflicts the current op amp. I would give OPA1652 and OPA1656 (and maybe OPA1688) a closer look as well. ZestClub. Sounds like those are amazing though. Jump to Latest Z. amb Site Admin Posts: 12185 Likes: 293 the LME49720 only tolerates +/-17volt, from opa2604 I was advised against "the opa2604 is unstable and above all not esd stable". 3 KB · Views: 128 H. Sonically they are not much difference. If 2134 is better here, I would like select 2134. com, but I think they will be "tuby" too. consists of 2 x 10 op-amps in parallel and the two 10s are I tried both OPA627 and OPA637 in this circuit, and both were pretty much the same because of the low gain setting of the feedback resistor. This article offers a comprehensive exploration of these differences, providing valuable insights for optimizing their The OPA627 and OPA637 (OPA6x7) operational amplifiers (op amps) provide a new level of performance in a precision FET operational amplifier. Device Information PART NUMBER CHANNEL PACKAGE(1) OPA1655 Single D (SOIC, 8) DBV (SOT-23, 5) OPA1656 Dual D (SOIC, (8) For the very small differences likely to be heard between well chosen op-amps, your memory will start to fade in 10 seconds. Is the OPA1656 the correct opamp to use? I heard it was the best so that’s why I picked it. I think its high bandwidth makes input filtering a must for audio use. The owner then ordered a set of Sparkos Pro SS2590 discrete opamps. opa627_vs_ideal_opamp_mod. -dan The OPA627 is mainly good for very low input bias - usually no need for this with audio. If there are more complicated parts (especially active parts) in the FB path, a faster OP can be a problem. opa627 (in dual), lt1028 (in dual), lm6172 Search. Bigbizkit. Joined May 4, 2008 Posts 2,045 Likes 31. While they share some similarities, they also have differences that make them suitable for different applications. The two others are opa2107 and opa627. I used to have a comparison written up between the 2132 and 2604, but I don't know where it is anymore. Every amp. Download. Joined 2020. OPA1656 - Better imaging / separation of instruments. Joined 2012. Another surprize , you'd think considering the price and age , next gen OPA827-828 would have replaced the 627. Overall, don't recommend opamp rolling. So to put 1 in a baggie exactly like the OPA1656 , they charge 15,69 $ !! , to put 10 in a baggie : 130 $ !!! TI does all the work and Mouser leaches more profit off from it. Victorinox. Jump to Latest dorkus. 9 OPA627BP vs OPA627 . Like Reply. TI recently introduced two devices worth looking into, updated BUF634A and OPA1656, both available as prototypes i will second the notion of the opa1612 being audibly superior to the ne5532 its a huge difference my daughter who patiently sat through almost 2 hours o bling listening tests on 3 upgraded cd players a nad 546bee with foil film coupling caps and 50 volt 100uf muse bipolar and wima fkp3 . Tested a lot of OP, including LME49720, OPA1612, OPA1642, MUSES8920 and MUSES8820. Last edited: Jun 12, 2020. Over Specified Temperature ±10. Thread starter rds; Start date Aug 26, 2008; Aug 26, 2008 at 5:53 AM Thread Starter Post #1 of 7 rds Headphoneus Supremus. This presented itself as a more refined and detailed version of the OPA2604. HiFiNutNut. I ended up staying with this one. 0:00 opa8272:30 opa627プリアンプの初段のオペアンプの聴き比べです。人気があり、偽物まで存在するopa627と、そっくりな音のopa827の比較です。opa827が 600 nm was for 5 V and 350 nm for 3. Reactions: Euphonic_employee, Xulonn, Speedskater and 5 others. asc. 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). Joined Mar 5, 2019 Messages 155 Likes 253. Home. Next, we will take a closer look at the comparison between the AD797 and OPA627. discrete, OPA627 vs. As anyone tried rolling the op-amps on the new Fosi V3? Which ones did you try and what changed in comparison to the stock ones? I don't have the Fosi V3 yet, but I just ordered one (with 48V PSU), directly from Fosi shop. Headphone Amps (full-size) Thread starter FritzS; Start date Feb 25, 2005; Prev. Much better in fact. HeyManslowdown97 500+ Head-Fier. I know one is mono and other is stereo. The OPAx828 operate over a wide supply-voltage for example Purifi Eigentakt and don't hear any difference even if it's meassure better. Not a huge difference for a huge difference. dorkus. Only the OPA627-37 go 2V over the rails . Joined 2002. • Slew rate: 24 V/μs • Gain bandwidth product: 53 MHz • Rail-to-rail output • Wide supply range: ±2. ) are virtually eliminated. Sounded like you had a cheap hobby, Motherone ! But i did read you first posting earlier, thank Operational Amplifier, 2 Amplifier, 10 MHz, 9 V/µs, ± 5V to ± 15V, DIP, 8 Pins TEXAS INSTRUMENTS - OPA2227PA Loesch of AMR fame regards that one as good, unless you move to singles on an adapter board using something like the OPA627. common mode voltage that I've measured on any op amp. The With that being said, there will not be a huge noise performance difference between OPA1656 (~4nV/rthz) vs OPA1678 (~5nV/rthz) when the thermal noise is already 11. There are a couple of ebay vendors (audjade_chn and hifi-szjxic, no affilation beyond satisfied repeat customer) that sell genuine salvaged chips at very reasonable prices. 5 ±11 * * V Common-Mode Rejection VCM = ±10. amplitude at 1kHz and 6kHz / 4ohm, unregulated 50V power supply View attachment 104323 Please note the strange nonlinear behavior at 6kHz. Soundstage: With most music, the 2134 is like 170 degrees while the Burson is closer to 190. That's the reason why the RKV is virtually immune to tuberolling. BTW 16 Euro versus 3 Euro is a considerable difference. However a lot of the newer opamps are as good or better and don't cost as much. Jump to Latest R. 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. Then clip out the Muting transistors (2 for each channel) one channel at a time and listen to the difference in between doing the second channel. 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. The sound quality is quite reasonable unlike most YouTube audio demos. I will have a pair of DT-770-250s by Tuesday. After a certain minimum ~ around 20V/uS, it doesn't seem to matter and other factors greatly outweigh slew rate. Why did T. Just saying. The RKV also has an auto-bias circuit on top of that, so differences between tubes (manufatcurer, age, etc. But still not as alive and warm as the Rotel 865. So what I need to do to make them work or can you recommend opa1656 as replacement for OPA2134? So the contact between The OPA627 has a high slew rate (which can cause oscilation problems), doesn't appear to include +Vcc in the common mode input range, and is a single, not a dual op-amp. Compare them on paper for 0:00 ad8453:53 opa627先日opa2134とopa2604をフォノアンプでテストし、当時のアナログ風味も悪くなかったのだな、とカンジました。で、これも少し前の Hi, Well I got my adapters and tried the 627 in my parasound preamp and the difference was almost as great as teh step up going from ad712 to opa2134 to opa627. And ADA4627, which appears intended as a direct replacement (a decompensated ADA4637 exists as well). The entire OPA627 line sounds obsolete compared against OPA828. Don't be tempted to use OPA637, it is not the right one on this spot. e. The test procedures/instruments industry has a far more than adequate portfolio of tests. Find parameters, ordering and quality information OPA828 ACTIVE High-speed (45 MHz and 150 V/μs), 36-V, low-noise (4 nV/√Hz) Burr-Brown™ single audio operational amplifier OPA1656 This is my first time doing anything DIY with audio. I bought mine from Hong Kong for about $18 each. 3V inside of each supply. Newer op amps provide a far more detailed and precise sound, which in turn also results in a broader tonal range. This OPA offers excellent performance for audio applications. Thread Starter. The OPA627 is recommended for this application. I've used AD8610, OPA627 but don't really have much concern for/belief in particular op amp's 'sound' once you get to a decent quality level Almost unmeasurable opamp A vs B (they're dual units) cross-talk and intermodulation distortion. Share Feb 19, 2008 at 8:39 PM. These op amps supply low offset voltage, low drift over temperature, low bias current, and low noise with only 60-nV RMS 0. Drift. www. It has a very good dynamic range and a low level of harmonic distortion. Taking advantage of a wide power supply range and mounted on a DIP8 bracket, opa627 chips should measure roughly 48kohms to 56kohms both ways across pins 1 and 5 and should draw about 7 to 7. 5 nV/vHz at 10 kHz but they are pricy (€40/pc) ! They are still manufactured and available. Actually it's difficult to find a neutral FET input op-amp. But, both have great 1/f nose and THDN overall, and fairly flat open-loop output impedance, so there shouldn't be any major audible differences. You are not “wrong“ in describing the Opa1656, it is recommended to be used in portable devices I/V stage because it has a input fet like the opa1612 and the opa1642. what are differences between 627BP 627AU 627AP AM . lightnloudsounds. In particular, it has very good dynamics OPA627 & OPA637 are only moderately fast opamps: OPA627 = 55V/uS OPA637 = 135V/uS in contrast a LT1364 is rated at 1000V/uS Slew rate doesn't tell everything. It is a very accurate OP amps with a linear restitution It is much less colorful than an OPA627 for example and it lets out all the micro details when listening In my experience any audible difference between well set up opamps is fairly subtle. The AD chips I have tried (AD823 and AD8620) have tended to be brighter sounding with less detail and soundstage, but more forgiving of recording artifacts and problems in the source. Ideal for DIY power amplifiers, DACs, and professional audio gear. I do hear a difference between two different Burr Brown numbers. 5 V to 36 V • Quiescent current: 3. It was obvious. 25 V to ±18 V 0. Couldn’t get any of the ADI devices they had to be bought through E14 or RS of memory. Home > Blogs > Transistor > LT1028 vs OPA627. In fact, dual OPA627 on Browndogs would have been something to consider as well. It offers exceptional performance in almost any audio application. On the α24, this is a non-issue. Specs: Very Low Noise: 4. Joined Jul I have tried both with my Alessandro MS-2s and I strongly prefer the OPA627. There isn't enough info about the topology of the input stage either that could lead The worst are the bipolar NPN's inputs with anti-parrallel diodes between inverting and noninverting input ( like OPA 1611) and like all others have diodes to the supply rails , so max input voltage goes 0,5 to 0,7 V above the rails . Btw, I agree with you, I prefer the OPA1656 over the OPA627 in one of my DAC’s. When compared to the popular OPA111 op amp, the OPA6x7 have lower noise, lower offset voltage, and higher speed. I then replaced the opa2134 with opa627. Also, the internal noise is quite low and comparable with The OPA1641 would be slightly better. One of the best I know and I tried a lot. The sound was improved. I then put it into my Zhaolu along with 2 NE5532 in the other two positions. 0:00 Susan Wong - Sunday Mornig OPA6271:23 Adele - Hello OPA6272:51 Radwimps - Grand Escape OPA6275:30 Yanagi Nagi - Harumodoki OPA6277:05 Susan Wong - Sunda Maybe a little dark but that might be nice for bright/harsh CDPs. DIY (Do-It-Yourself) Discussions. output amplitude. ) Compared to OPA627 and OPA827, Other Parts Discussed in Thread: PCM1794A, OPA627, OPA1637, OPA1656, OPA828. Search titles only By: Search Advanced search Search titles only By: Search The human ear CAN distinguish -0. The V6 Vivid has a faster attack than the classic, but still not quite as fast as the SS360x which allows the SS360x to wring out just slightly more detail than the Vivids. the OPA627 metal had a wire to the can too, so it was really shielded! Also at this old days, a BB engineer told me, that the chip was build on a glass substrate, otherwise the better figures could not be fulfilled as on plastic. 25 V to ±18 V or 4. com next week. 7 Vrms, ignoring the saturation voltages of the output stage. Check the spec, 4627 has a 18 V/us slew rate, normally this should be enough for an audio purpose OP. 9 $ , they have a decent margin ? Since the opa627 datasheet recommends 0. 5 mA quiescent current. Using my Pimeta, it did not sound too different from the OPA627. And OPA627 is a single amp (won't fit). However typical The original amp has the OPA1656 and the other has the OPA1642. Both BB's sound really good to me. Many people have already replaced 5534 with 627 in various applications and it seems to work well. While they share several similarities, their design and performance aspects position them for different applications. the 'u' chip is a smaller surface mount part, the 'p' chips are the 8-pin ones that mount in a socket. I’m going to solder the IC to a soic to dip adapter then plug it into the the amp. I . USD, others are two or three USD and the 627s I believe, are around $30. I doubt I will jump up enough to try a Sparkos or Burson. Joined Oct 29, 2015 44. Two identical gain 11 amplifiers were tested. I previously owned a Maverick D2 DAC with 3 OPA627 op-amps and found them more textured and open. The best device thus far is the opa2107, its ability to pinpoint where instruments position themselves and to suggest at the same time getting exceedingly close to the anticipated Texas Instruments' OPA828 JFET is the next generation OPA627 and OPA827 op-amp combining high speed with high DC precision and AC performance. T109 to T112. I. The OPA1656 operates over a very wide supply range of ±2. I can test the OPA627,637 and 2227 in my Pimeta if you want. Of course op amps are not his first choice. For peace of mind we may want to generously extend that to 3x, that is, 21+39Khz and test within a 60kHz But MHO is that if you want a 1656 single, spec-wise the OPA627 single (unity gain stable) and its faster sibling the OPA637 (gains ≥ 5) come real close to or better the much newer OPA1656 dual. Joined But first check it out and fix it if necessary. To reproduce this level cleanly at 20 kHz requires a The OPA627 opamp The OPA627 from Burr-Brown is a laser-trimmed JFET input opamp with excellent DC precision; the input offset voltage being typically ±100 The AD797 was a response to the popular Opa627. OPA828 / OPA2828 vs OPA627 Thread starter mudihan; Start date 2023-06-08 2:24 pm; Prev. I currently have the AD8610 still in there. of ±2. Chances are that laymen will be creating RF transmitters without knowing. Post #16 of 26 Sovkiller Proved that despite its huge size the CD3000 can be shoved down one's throat. 5 V to 36 V • Dual and Quad Versions Available • Small Package Sizes: Dual: SO-8 and MSOP-8 Quad: SO-14 and TSSOP-14 2 Applications • Analog and Digital Mixers • Audio Effects So you ultimately be limited to at least 2V between voltage rails and peak output voltage. The OPA627 biased into at least 5mA class A at the OP is very good. Please don't forget to remove the compensation cap that is usually mounted when NE5534 is used ( 22 pF ) because OPA627 is compensated internally. WOW, what a difference! The music was back again. 000035% of opa1656 so may you can start your talk there. Since I am not interested in the V6 Vivid Dual that it comes with. Joined 2004. . Even using quality headphones it's a challenge to pick any significant differences let alone the night and day High end OP's - LM6171 vs. 9 mA of supply current to accommodate the power-supply constraints of many types of audio products. Member. Only in Electronica was the soundstage not much wider and imaging not much improved. I like the OPA134 and related SoundPlus I know there is little difference between these two OP, but I want to know which is better. 25 V to ±18 V or (4. 4 nV/rthz. OPA828 / OPA2828 vs OPA627. The subjective parameter being first and foremost sought is ability to reveal depth in music. For audio use, I see no reason to buy OPA627 when you have OPA827, OPA828, OPA164x, and OPA1656. 9 mA of supply current to accommodate the power supply constraints of many types of audio products. I have settled on 4x OPA1656 in my Burson headphone amp and 4x OPA1655 in my Ayon DAC. MUSES8820 is the best, IMHO. Share Jun 12, 2020 at 5:42 PM. OPA828 / OPA2828 vs OPA627 By now it has been a while since OPA828 (and OPA2828) were The qualities of this chip are exactly as I've heard described for OPA627 - very well controlled bass, with no treble harshness, resulting in a clean, dark sound. g. abandon BB's DiFet type of opamps ? lme49713 vs opa627 vs AD815 vs opa2134 vs opa1612 vs opa2836. Probably not an easy drop in for many audio devices. After 24 hour run-in, I could not really tell the difference in sound. Same goes for correct decoupling. I am planning to replace the NE5532 in my Burson Funk with the OPA1656. So, I am reviewing the OPA627 as a baseline vs the two Burson op-amps to see any difference. com OPA1656 is a ultra low noise fet operational amplifier and delivers a low distortion of 0. 4; 5; 6; First Prev 6 of 6 Go to page. The device is offered in an 8-pin SOIC package. The op amp offers a temperature range of -40°C to +125°C and is available in an 8-pin SOIC package. The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on the market. The OPA1656 operates over an ultra-wide supply range of ±2. 7. 2003-01-06 11:45 pm #3 2003-01-06 11:45 pm #3 I´m using exactly the headphone amplifier from the BUF-634 datasheet with an OPA627 (oh, are those samples for me). Reply reply Of the op amps in my collection the massive misbehavers are the OPA1656, the LME49990 and the OPA1612. opa1678 should sound much like the opa1656 as it seems to be the same Opa1656 and opa1612 without tweaking have better performance than almost any discrete solution. The temperature range is specified from –40°C to +125°C. AD744/AD746 or OPA627/OPA637 uses two voltage gain stage in the NFB-loop (LTP-VAS-Buffer) According a lot of listening tests I always note crispy and If you want a FET at all costs, you can try the OPA627 type. NMJ2068 datasheet looks pretty old. These op amps supply low offset voltage, low drift over temperature, low bias current, and low noise with only 60-nVRMS 0. There are some things to watch out for when swapping op amps. 2012-08-24 7:28 pm #1 2012-08-24 7:28 pm #1 hi i wanted to know if anybody have used the above opamps. Not targeting Mouser here , most of the others are worse. The difference for the OPA627 is far more realistic and more intimate. M. At least, that's my understanding. Equipment Forums. From what I know the OPA1656 is currently the highest-spec audio grade standard opamp that TI offers. 3 MHz. The four muting transistors are by the output wire and look like four black half moons. But still, nowhere close to the 12B4. Since noise dominates the THDN at lower amplitudes, it will continue to reduce vs. Contents LT1028 Features OPA627 Features LT1028 vs OPA627 Final Words. (RL is the original 2kΩ. I also notice the more airy sound and the overall music presentation is more special with this op-amp. Dec 27, 2019 #7 restorer-john said: It's the equivalent of this: Note the OPA627 graph shows THDN at +/- 10 V, whereas the OPA1644 and OPA828 use +/3 V. This op-amp supplies low-offset voltage (50 μV), low-drift overtemperature (0. VOS Input offset voltage VS = ±15 V ±100 ±500 μV dVOS/dT VOS over temperature(2) TA = –40°C to +85°C 1 4 μV/°C PSRR Power-supply rejection ratio VS = ±2. I was still using the opa2134. Gallery Looking back at history, I have been discussing op-amps (and gain clones) in the chip amp section for 19 years. I was really looking at the opa1656 but it seems like it’s going to take a month and a half to get here, all the soldered adapter ones on I have OPA627's on a Stokes SDS class A headphone amplifier, before those i tried lower priced opamps. Especially when price is considered. There is more of them with bipolar inputs but they will be suitable only OPA828 / OPA2828 vs OPA627. The OPA627 is mainly good for very low input bias - usually no need for this with audio. So putting a military grade with slightly bump in specs at the time used for military purposes and now discontinued and decreases its supply while Increasing it’s demand value. I even notice a difference between AP and BP versions of the OPA627 on the SDS. . This gave me a chance to 0:00 opa8282:30 opa627プリアンプの初段のオペアンプの聴き比べです。人気があり、偽物まで存在するopa627と、その血統で最新型のopa828の比較です。 This OPA1656 OPA from Texas Instrument offers very good performances for audio use. Thread starter rhythmsandy; Start date 2012-08-24 7:28 pm; Status Not open for further replies. I currently use the OPA627. Share Reply Quote. (and I'd forgot - my bad) a whole thread here about the TI CMOS OPA1656, which (apart from a somewhat high 1/f frequency) pulls the same stunt of rail to rail, and is a seriously Replacement for OPA627? diyAudio Community diyAudio Store. The OPA1656 is the new kid on the block, and has the most impressive data sheet specs. However, it doesn’t sound like those two chips at all! It’s very musical imo. It is more alive and sharper image for 4637. I must experiment Below is a comparison between OPA1656 and OPA1642. Zen ? Thread starter dorkus; Start date 2001-06-16 7:57 pm; Status Not open for further replies. The difference was both significant and better. 0:00 OPA8283:00 OPA8276:00 OPA6279:00 MUSES05signal chain DENON DL301Ⅱ~[ OP-AMP phono-EQ ]~OPA1622 voltage follower~ZOOM H5OPA627は、高音質で有名なオペアンプです。 OPA827は I don't know about compared to that AD opamp, but the OPA627 is a dark-sounding opamp with incredible detail and a very nice soundstage. 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 I have opened up my Monolithic PS-1 phono preamp and find that its using two OPA132A's. 2021-08-09 1:33 pm #2 2021-08-09 1:33 pm Yes I have OPA1656 and those are great and followed everything in forum but havent done the PFBB beacause I don't run balanced out which I think is major The AD797 and OPA627 are highly regarded operational amplifiers (op-amps), acknowledged for their exceptional precision and low noise characteristics. joensd. The completely docile op amps are the OPA2604, the OPA627, the OPA2107, the LM4562/LME49720 and the OPA2134. Post #8 of 16 audioengr you can find OPA637 and OPA627 fairly easily on eBay. For example, can OPA627 also be I have an Onix XCD-99 which is basically a Music Hall CD-25. Their MOSFET input with very low common-mode modulation of input capacitance should be a good match to the highish-impedance circuit. OPA604 vs. Compared to my setup before, which used a OP275, I'd say there was The most obvious difference it the wider soundstage. The low voltage noise combined with the low current noise make this device great for low and high impedance applications such as a high gain microphone pre-amplifier. 5V 106 116 100 110 dB OPEN-LOOP GAIN Open-Loop Voltage Gain VO = ±10V, RL = 1kΩ 112 120 106 116 dB Over Specified Temperature VO = ±10V, RL = 1kΩ 106 117 100 110 dB SM Grade VO = ±10V, RL = 1kΩ 100 114 dB FREQUENCY RESPONSE Slew Rate: OPA627 G = –1, 10V Step Over Specified Temperature ±10. It is very smooth indeed but it feels like the soundstage is blown up like a balloon. Depends on at what frequency you look; noise-wise, the OPA1642 is better below 500 Hz and the OPA1656 above 500 Hz. not going into high frequency oscillation) are different and just swapping ICs may cause problems -- you might need to add some DIY preamp design - gain topology, IC vs. Selection of an appropriate op amp for the I/V converter is critical for obtaining optimum dynamic performance from the PCM1704. The output swing for Aol should be considered as it is different between the two devices. 6mA of supply current For comparison reference, the waveforms of RRO type OPA1611, 1641, 1655, ADA4625-1, and non-RRO type OPA627, 827, LME49710, ADA4627-1 are attached. The OPA627/637AP cost about $18/chip and you need 2. 1uF polypropylene for bypass. Also, the internal noise is quite low and comparable with very low noise op-amps. 1989, Burr-Brown introduced the OPA627, now considered an audio technology classic, as the industry’s first – OPA1656 , an audio op amp with ultra-low noise and distortion for professional audio applications. Since they have identical response within the audioband, It is most likely that the standard ideal opamp should work well for audio active filters. The sound was more melodic, more fleshed out, piano and guitar sounds were much more lifelike and voices a lot fuller. There's a series of uploads on YouTube featuring most of the popular opamps. com. ti. Whats your thoughts? V. I also swapped OPA627/37 and the AD8610 in my headamp, however i could tell little to no difference. Lot of this happening on more expensive parts like this. Misc. 25 V to ±18 V, or 4. Out of curiosity, I ordered an OPA2604 as a spare chip along with several other The RKV's circuit uses a lot of feedback, and it is through this how the Opamps shape this amplifier's sound. OPA627 (-120 dB, 2nd & 3rd @ -7980 dB) OPA827 (-120 dB, 3rd @ -86 dB) OPA2132 (-115 dB OPA1656 / OPA1612 / Burson V5i / OPA627 / Genuine NE5532 / Genuine Muse 02 / 0PA1622 / OPA1642 / OPA1602 The question of Op amps has already been debated on DIY audio, and I had used the OPA1656 and I think the opinions are unanimous, these Op amps are very good and seem to work the best with those amps. org. To my ears OPA627 is a much preferable opamp to the LT1364. The cost difference comes from the manufacturing processes involved - OPA627 requires an old process to be maintained, which has driven up the cost. 00 ea. 000035% (–129 dB) at 20 kHz If you love the OPA1612 you will love the OPA1656 too. Post #6,915 of 7,419 H. I think at that level, there really isn't much audible difference, so if it turns out cheaper, it would definitely be the better choice. And don't discount the OPA2810! 100-MHz bandwidth, JFET-input, 190 V/us slew rate, with lower noise and distortion than an OPA627, and consumes only 3. 25 V to ±18 V (4. 45 μV/°C typical), low bias current (1 pA typical), and low noise (4 nV/√Hz typical) with only 60 nV RMS 0. 5 V to 36 V) on 3. all those BP, AU AP AM what do they mean? Thanks . They claim better performance than 4558 type amps. There's no Hello, i just compared my current favourite opamp opa1656 vs the much older opa627 (its a dual module from audiophonics, the IC`s are "used" if this I have one in a Aiyima a3 Tube preamp together with dual OPA627 and Voshod J6 tubes. Beware of counterfeits. I know OPA627 is 1029 less than OPA 1656 Search for it on google for OPA627 and OPA1655! for 5534 replace No one can tell you the difference between an OPA1655 and an OPA1611 in a Wiim. -Category Forums. For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. The OPA1655 is the single channel version of the OPA1656. Page: 42 Pages. Hope this helps, An update from me. Jan 11, 2016 SSZT411 September 2019 OPA1656, OPA627, TAS6421-Q1, TLV320ADC5140 1 2 3 Company History 5 A New Era with TI A Next-generation Audiophile Looking to the Future Additional Resources TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out The AD797 and OPA627 are both high-performance operational amplifiers (op-amps) known for their precision and low noise characteristics. The AD8620 was my fav, i would have to tried to swap between the OPA627 in my 0404, but I was very pleased with the amount of clarity and separation i got, was definitely worth it. 4637 has much faster slew of 100s. It uses OPA627 and BUF634. The OPAx828 operate over a wide supply-voltage range of ±4 V to ±18 V and a supply current of 5. TI-Produkt OPA627 ist ein(e) Präzisions-Operationsverstärker, 55 V/µS, Highspeed, 0,8 µV/˚C max. Noise and distortion wise OPA1641 or OPA827 perform better. SSZT310 – SEPTEMBER 2019 Submit Document Feedback vs Burson V6 Vivid. When it comes down to the THD I The OPA828 and OPA2828 ( OPAx828) JFET input operational amplifiers are the next generation OPA627 and OPA827, combining high speed with high dc precision and ac performance. 1 1 μV/V INPUT BIAS CURRENT VCM = 0 V ±60 ±250 nA IB Input bias current VCM = 0 V, DRG package only ±60 ±300 nA IB over temperature(2) TA = –40°C to +85°C • Slew Rate: 10 V/μs • Wide Gain Bandwidth: 18 MHz (G = 1) • Unity-Gain Stable • Rail-to-Rail Output • Wide Supply Range: ±2. The OPA6x7 are useful in a broad range of precision and high-speed analog circuitry. But not with me, ive seen how these discussions usually end up 😅 The OPA627 was released in the 90s and we're still selling them in high volume. Thanks in advance Neville www. 87. So put 10 x OPA1656 in a bag to send costs 16,76 $ , to put 10 x OPA627 in a bag to send costs 130 $ . 2021-04-12 2:03 am #500 2021-04-12 2:03 am #500 Nelson Pass has reasonable thought on TI’s OPA627 is a 55V/µs high-speed 0. And they are expensive. 004% distortion of your dear champion and -0. 5 metre cable at 33. But the 1612 and the LME 49720 are my favourites and it’s hard to decided which is better! The worst one I ever got and was well over price due to the hype on HeadFi was the OPA627. But of course, how they're implemented and how they interact with the sound system as a whole makes all the difference. One other very noteworthy Substituted the OPA627, biased into class A with JFETS (2n3819 with 2SK170) with an unbiased AD8610 in my pavel macura style pre-amp (OPA627 into BUF634) which feeds a NIGC). fnswgxhr quakragv smeia gzgvw hhthjnno rwnve uhalus imjdmp esngnzvda wuzzcb