Opa1656 sound reddit Voltage noise is higher on 1656 at low frequency til 1khz. 50 NE5532 to a $2. that gives enough time constant to allow a substantial popping noise. 1) ADA4627-1ARZ = $7. Cimarron has the 1641 in SOIC-8 OPA1641AIDR Texas Instruments - Cimarron Technology They can also mount SOIC-8 on a DIP-8 adapter. diyAudio Donor. so @johnc124 could explain to what extent the OPA1656's CMOS process is better than those of 10 years ago Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. Also, I typically preferred simplicity in the op amps I developed. I got 1,000 x LME49720 DIP (USA) in Oct 17 (panic buy due to phasing out). Today had a chance to swap it into my amp and give it a listen. It outperforms most other opamps, very low noise & distortion, doesn't color the Last week TI put a preliminary datasheet online for the OPA1656, a low noise, very low distortion op amp targeting audio applications and fabricated in a CMOS process. 4nV/rtHz both flat. 5Vrms signal, 80-kHz measurement bandwidth; 53 MHz gain bandwidth product, 24V/us slew rate >100mA output current; 4. The OPA1656 needs at least 4. I have the Opa1656 and it’s fantastic! I’m dying to try the Opa1692 as In my particular amp, opa1692 has narrower sound stage than opa1656, as 1692 is designed for portbable use with trade-off (low power draw). That put the 47k input resistor in series with the input (with noise disadvantage of course), and the feedback incorporated the volume control. Vendor's Bazaar Just going into some more details with the OPA1656: with an average 3. simon7000. I´m afraid the specs make it a bit difficult to compare. Given these characteristics, there is a solid use case for my bedtime music sound profile (which can take quite few hours of listening each night)! 1656 is in my newly designated relaxation & sleeping tube preamp which I can just swap in Given these characteristics, there is a solid use case for my bedtime music sound profile (which can take quite few hours of listening each night)! 1656 is in my newly designated relaxation & sleeping tube preamp which I can just swap in I've been using mostly LM4562, except when I need a JFET opamp (high impedance inputs for example). Last edited: 2020-11-24 11:12 pm. The OPA2156 has amazingly good distortion as well, you just might want to load the output a little less than a 1656. I assume you are dealing with audio frequencies (and not MHz applications)? S. Opa1656 has good phase response at high frequency. common mode voltage that I've measured on any op amp. Facebook Twitter Reddit Pinterest Tumblr WhatsApp Heretic : OPA1656 ∗ op-amp for voltage gain with local feedback, OPA1656 (6 stages per channel) as output buffers with local loops, no overall loop feedback. and rolled op amps to OPA1656 . I’m sorry to disappoint, but I cannot answer that question Yes the Hel 2 will sound different since it uses an AKM 4490 dac versus a Cirrus Logic CS43131. com with a Reddit's original DIY Audio subreddit to discuss speaker and amplifier projects of all types, share plans and schematics, and link to interesting projects. The OPA1656 specifies THD+N at -130dB @ 10Khz and a BW of 80Khz, why is that, how does the spectrum look beyond 80Khz ? Also take into account that when using Dont swap the opamp blindly, it only causes issues. It uses 6 parallel opa1656 stages per channel with zero global negative feedback. 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 • audio·phile: a person with love for, affinity towards or obsession with high-quality playback of sound and music. Facebook Reddit Pinterest Tumblr WhatsApp Email Share Link. The opa1656 is quite an analytical op amp and doesn’t really suit my ears at least but the opa2134 is another story and the 560s matches that op amp in the U3 very well. Home I liked the opa1656 but is there an easier opa which has a nice pleasant sound or even better because easier about the layout and decoupling technics ? Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. OPA1656 had respectable slew rate without slew boosting so I opted to forego that circuitry in the audio part. Big difference in price but not necessarily sound quality using your ears, as the test bed Factor in that the ADA4627-1 is a single & OPA1656 is a dual Good info none the less, thanks, JohnC and the the TI/BB team should be very proud of their accomplishments. I think it's a matter of circuit design and implementation. I am excited to see if anyone wants to try to use it for audio 🙂 I am working on an audio reference design using the DAC11001A that I hope to release on the web in the next few months. I drew up a full schematic in Kicad of the circuit I have a 500 sqft room, and purchased a bale of 12 boxes (6 in each) of 24x48 rockwool safe and sound mineral wool Insulation at home depot for $500 delivered. Joined 2021. 4 KB · Views: 403 Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. Hi, Just got interested in the OPA1656. 3K subscribers in the hifiaudio community. The SBX G6 has a dual mono push-pull discrete amp versus Hel2's 4 stages of TI OPA1656 opamps per channel. Theme - Light; YYYY-MM-DD / 12-hour clock; Contact us; There are several hundred LM4562 DIP (UK supplier) that I got up to Oct 2016. Noob trying to build a passive headphone filter for testing, trouble finding components upvotes If this is an audio project, close your eyes and just get the 627 or the 637 depending on the gain needed. The bass has more texture and force while somehow simultaneously allowing the highs to getting even more MOS transistors are known for their large 1/f noise, although you can reduce it as much as you like by using very large gate area devices, at the expense of more chip area and more capacitance. Digital Line Good morning. OPA1656 also has a pole-zero pair in the open loop gain curve to boost the open loop gain at audio frequencies (hence the 53 MHz gain bandwidth product). Altered text SYMATTR Value OPA1656 SYMATTR Prefix X SYMATTR SpiceModel OPA1656. Opamps do indeed change the sound if only ever so slightly in most cases. Also you were thinking about spending $200 on this, that could get you the orbit on sale. (where most of TI's audio op amps come from) is releasing are guaranteed over the extended industrial temperature range of -40 to 125 degrees C. I am feeding the U3 with an Audioquest Red from the PC and have no issues at all, very sweet, detailed sound, well balanced and a touch of warmth. Taking a 500Khz BW, increases this THD+N figure to -123dB. Members Online. The third time I added in njm4585 very cheap but pretty good opamp in the comparison. Equipment & Tools. OPA1656: High-Performance CMOS Audio Op Amp. JPG. My interconnect between the TT's output RCAs and the RIAA pre is 3ft and 17pF/ft. Design & Build. I don't care about listening tests or something else, just want to use I prefered the sound of my DAC with the OPA1656's hands down even over the discrete op-amps. Joined 2016. Mouser has 86 OPA1656's, when they are gone it's 73 weeks. Benefit is lower dc offset and less distortion also high open loop gain also superior stability. I'm looking for opamp better than OPA2604 witch big soundstage, and "analog" like sound? But e. As noted, the problem was gone after I switched to the OPA1642 (I am combining the chip with another opamp position). And opa1656 and opa1612 doesn't sound any different. Maybe you should post here : OPA1656: High-Performance CMOS Audio Op Amp It's the OPA1656 fanboy thread . 2 and accuracy and low-noise performance comparable with the best bipolar-input operational amplifiers. diyralf. When both amps at Vout=3. 72 each What gain are you running in Just to be clear, since the OPA1655/6 are not specifically mentioned in this presentation, we can't conclude that one of the processes listed is the one used for OPA1656. sunlai. Congratulations! It looks like a really good designs. Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. Low-distortion Audio-range Oscillator. 1mm DC jack and 3 x 1/4" audio jacks. Our primary goal is insightful discussion of home audio equipment, sources, music, and concepts. OPA1656 - FET input The OPS627 has very low trimmed offset (not needed for audio). This subreddit is a place to showcase and discuss things related to high fidelity audio. OPA1656: High-Performance CMOS Audio Op OPA1656 is clearly lower noise. I tried a lot of opamps and the only one that improved it was the OPA1656. The attached layouts are from the Gerber files exported from Kicad. Gallery Archive Articles. But the warmth in mid frequency (1k-4k) is gone. 5mA max I have an OPA1656 story that may be interesting especially to whomever wants to build the RIAA preamp example in the apps section of the data sheet. test_sch. The OPA1656 immediately raised my attention, plus there was/is a long thread about it on diyaudio. It's best use as an alternative to opa1612 when noise is not a big concern. 9nV/rtHz broadband voltage noise; 6 fa/rtHz broadband current noise-131 dB THD+N at 1kHz, 600 ohm load, 3. 500uV for the OPA1656) but that's largely irrelevant for audio applications. When you take into account A- or ITU-R 468-weighting, it doesn't contribute all that much to the total If you get an opamps within the specs of the original one and it's an updated one like opa1656 opa1692 etc then having newer tech is always fun and as many can attest sound better. 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). 2022-05-16 2:14 pm #9,871 Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. I looked at the Slew Rate as my main It's a two-stage design, with one OPA1656 taking care of amplification and two OPA1678 op-amps as output buffers. Members Online Crossover impedance on the amp Amp 3 : Dual TPA3221 / OPA1652 (stock PSU 15V / 7a + FX Audio 24V / 4A PSU) Amp 4 : HanZao TPA3255 / OPA1692 + Shui Yuan OPA1656 Playlist : HD audio via LDAC BT Indroduction : This dual TPA3221 • audio·phile: a person with love for, affinity towards or obsession with high-quality playback of sound and music. Source I didn't know the HD600 could sound this good. Or check it out in the app stores &nbsp; reviews and DIY projects related to portable audio, headphones, headphone amplifiers and DACs. Source & Line. The little case is really cool, and congrats for soldering that good those little SMD components! Got OPA1656 delivered few days ago. I have an Fosi Audio V3 on the way. I just haven't gotten around to designing and 3D Get the Reddit app Scan this QR code to download the app now boomboxes, mini systems, portable bluetooth, lifestyle speakers, and PC peripheral branded audio solutions. My point is that you can see that TI's analog and mixed signal processes are designed for the intended products, not attempts to tweak low-voltage digital processes to do analog. Very clean and natural sounding amps as standard, not as full or punchy as my Naim but still impressive for their size. Theme - Light; YYYY-MM-DD / 12-hour clock; An attempt to get around this problem was tackled in the 1960's in the first Cambridge Audio product. I expect to sell of the OPA1656 ? 10 million ? 100 million ? OPA1656 DIP8 Ultra Low Noise and Distortion FET-Input Audio Operational Amplifie | eBay No complains at all. Yo The OPA1656 has 6dB more open loop gain at audio frequencies, hence the better distortion. Still, I think 1/f noise is overrated for audio. 53MHz, which allows for higher feedback factors to occur, which is beneficial. But it is not very flexible for audio measurements. Please excuse the following, but it's the best way I can describe the improvements. There's other valid reasons to give schiit crap but slightly flowery language on a two sentence ad copy isn't really among them because they give more actual details and specs on their designs than pretty much any other audio company. The OPA1656 has a high unity GBW product- 20+MHz, and a somewhat more sophisticated than just-a-plain-integrator compensation scheme that allows the effective GBW product at audio frequencies to be higher- c. The circuit itself is pretty straightforward and I've successfully I replaced it with an OPA1642 and am sorry to say that there is a big difference sound-wise. If you are a critical listener with the best amps and headphones you will hear a slight difference between the balanced and SE outputs. From the OPA1656 data sheet: Reactions: tschrama. 2021-04-11 11:32 pm #494 2021-04-11 11:32 pm #494 chris719 said: For audio use, I see no reason to buy OPA627 when you have OPA827, OPA828, OPA164x, and OPA1656. LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. If you believe some simulation results over the datasheets that's your choice (and problem, I would say). 9nV/rtHz vs. M. Anybody know beter opamp than OPA2604 with realistic "analog" Opamps don't in general draw constant current vs signal so to keep power rail noise as low as possible, arrange for the lowest impedance power and load them as lightly as practically possible. 81 each 2) OPA1656IDR = $2. Log In / Sign Up; Advertise on Reddit; Shop Collectible Avatars; Get the Reddit app Scan this QR code to download the app now. The 10x opa1656 sounds interesting. Added a new OPA1656. Hello diyAudio forum, I was looking at the SE/SE Wire headphone amp recently but I found out that the LME49610/49600 buffer isn't in stock anymore so I looked at alternatives and found the BUF634A. Audio, Audio, Audio! The OPA1641 would be slightly better. Or check it out in the app stores &nbsp; &nbsp; TOPICS reviews and DIY projects related to portable audio, headphones, headphone amplifiers and DACs. 1641 is one of their many options. That is, when you do the math, you find that 1 nV/sqrt(Hz) of 1/f noise at 1162 OPA1656 ( modern clean smooth sound, nice "deep" bass, which is "the" pro for me for this opamp ) OPA627 ( goes actually into the oldschool direction, it has similar attributes as the burson V6 vivid, but latter sounds more refined ) Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. Opa1656 is the audio version of the opa2156, which came earlier than the opa1656. Sound is cleaner comparing to OPA2134. (2 x 4 channels), but I dont like tube sound they provide, I have scanspeaks as drivers and dont need more "tube" warm sound. 99uV, or a THD+N of -131dB below 3. Are you hearing any sort of channel compression, distortion or lack of low bass or bass definition with the HD700s? There is no practical audio program material which will have 24dBu (which is what 17. By comparison the OPA1642 has a max offset spec of 3. Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link Sounds logical. 5Volt, just because the THD with -150dB vanishes in the noise. Phono preamp is a standard circuit, found in the OPA1656 datasheet. diyAudio Community That open-loop gain & phase graph was done with 10 pf load, maybe 10 cm of audio coax -- ignoring the connector. So two op-amp sections are paralleled to increase the Hi John Yes, did it my way 1. It has the most stable input capacitance vs. Or check it out in the app stores and since the NX4 was released, Texas Instruments released the superior OPA1656, with almost half the THD+N, over double the the all important question; does it sound better??. 5Vrms, Gain=1 and Load=2k The INA851 specifies THD+N at -110dB @ 10Khz and at a BW of 500Khz. This subreddit is for the budget minded audiophile that wants to grow out of soundbars, boomboxes, mini systems, portable bluetooth, lifestyle speakers, and PC peripheral branded audio solutions. Not much yet on the 1656 as an audio amp. In my opinion it sounds the best at close to max volume. The spec sheet overshoot graphs show you want care with capacitive loads such as lines longer than an inch or two, and reading between the lines suggests best practice is a 50-ish ohm isolation resistor immediately after the opamp feedback loop. This next bit depends highly on your chosen topology for your transconductance amp, but in a worst case, say you had to source 100mA into a near-short to ground. Analogue Source If I needed 1 clean Watt for my 107db w/m mid/high horn how many of the OPA1656 would I have to run in parallel? Mark Johnson. Member. OPA1656: High-Performance CMOS Audio Reddit's original DIY Audio subreddit to discuss speaker and amplifier projects of all types, share plans and schematics, and link to interesting projects. Gallery OPA1656 swapped in to I/V and buffer on BF2 analog board. The 627/37 con is that they are expensive. Gallery Archive Get the Reddit app Scan this QR code to download the app now. The old 49720HA sounds more direct and dynamic than the newer SMD opamp. verifitting Will try to look into the OPA1656 :), seem to be a common recommendation or idea for a replacement for the MC33078N. Get the Reddit app Scan this QR code to download the app now. I dug out all my op amps and had a day of “rolling”. Copied the given . Quite a nice upgrade. I ran LTSpice on it and 2 other versions I found, and they performed identically. Now you are able to audition the AD746 and the LT1124 and the AD8599 and the OPA2209 and the LME49723 and the OPA1656. Or check it out in the app stores reviews, purchase recommendations, audio, sound, and relevant discussions. However I would take care of the noise a bit more. 2020-11-21 6:12 pm #375 Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. OPA1656: High-Performance The (un)official home of #teampixel and the #madebygoogle lineup on Reddit. The only noise I get is the standard background white noise which isn't going away. At least when I’ve done searches on “best op amp for audio” the OPA627/637 are on or near top shelf in the opinion of those DIYers who listen to many. A TSSOP8 to DIP8 adapter should work. OPA1656: High-Performance CMOS Audio Op Amp To start, OPA1656 is definitely not a replacement for OPA1622, the two parts were designed for with very different applications in mind. It is a bit of a science project, but I am seeing nice audio performance and I am using John's opa1656 as the primary output buffer. The single-ended uses the OPA1656 opamp, again the standard output opamp used in several Schiit products. This makes sense for audio applications of course and in no way detracts from the stellar performance. My intent is to make it fit inside a Hammond 1590A case, along with a 2. Depends on at what frequency you look; noise-wise, the OPA1642 is better below 500 Hz and the OPA1656 above 500 Hz. Get support, learn new information, and hang out in the subreddit dedicated to Pixel, Nest, Chromecast, the Assistant, and a few more things from Google. (OPA1612 or OPA1656) is the better one, in a scientific point of view. New with Op amp chips, any recommendation for Beyerdynamic A1/A2 Would like to exprement a bit with the sound. jan. Reddit's original DIY Audio subreddit to discuss speaker and amplifier projects of all types, share plans and schematics, and link to interesting projects. 0mA typical supply current, 4. Joined 2008. 5V to run (I'll assume you're using at least 5V). Even with the stock NE5532 it oscillates randomly. Mine is less than 0. r/audiophile is a subreddit for the pursuit of quality audio reproduction of all forms, budgets, and sizes of speakers. Attachments. diyAudio Community diyAudio Store. 27 KB · Views: 347 meas_results. Vendor's Bazaar. It’s still early but I can safely say the opa1656 is a special one as far as THE ultimate utility “operational” amp that makes ANY great sounding op amp sound nearly blissfully perfect! It’s a bit trembly but not annoying just not I'm gonna get the 1656 samples next week and have my surface mounting friend get them on dip adapters. How do you test a quad opamp like TL084 in a dual socket ? Personally , I admit to buying expensive opamps hoping they are better than the rest BUT in a preAmp with OPA627's I used OPA132 for the treble and bass and couldn't hear any Normally you'd regularily search in the manufacturers new product listings first for any new interesting products. Overall really love the A quick snapshot of the OPA1656 performance specs: 2. View community ranking In the Top 1% of largest communities on Reddit. 91. 1$ for a OPA1656 is unbelievable, Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link. " and OPA1656. This fully conforms to the specs. lib SYMATTR Value2 OPA1656 SYMATTR Description TI/BB Audio FET Opamp to get the same symbols as the Very impressed by the Fosi ZA3s in mono. 75V peak corresponds to) at 20kHz. OPA1656 drives without problem 600R, so 25 or 50k should be a laugh. aX tech editor. Home. It sounds like you may have interference issues in your area. 5nV/rtHz, over 80Khz, gives 0. there is also much talk about the NE5532 being fake also and i ended up going to OPA1656 on DIP8 sockets im not a expert but i feel it sounded better with my ELAC debut b6. 3uV 20KHz BW. It's a big beautiful world out there! Reactions: Elias Most DACs to me usually sound a bit sterile and have a digital edge to them. Show off your Quick sim to illustrate the above, using datasheet spec of Cin_diff of 9. My First DIY Headphones, Featuring Handmade Planar Magnetic Drivers from Torac Audio and the op-amps in the low pass filter section were swapped from the original TI OPA1652's to the technically superior OPA1656's. opa627 (in dual), lt1028 (in dual), lm6172 is too much speed, and are unstable in my tube-opamp hybrid preamplifier. SOIC-8 to 8-pin DIP Currently kind of assessing the OPA1656 following your excellent thread(s) - very modestly in some line output stages of my HIFI. OPA1622 was targeted specifically for headphone applications, while OPA1656 is a more general purpose device meant to address analog signal processing in line level audio circuits. Forums. We focus on education, discussion, and sharing of entry and mid level separate & multi component audio systems. My room sounds great - no foam! Not sure if we have the same understanding of "noise figure" but nevertheless, OPA1656 is less noisy than the OPA827, 2. I was finding 30-40% to be below-par in terms of burst noise. i fell down the opamp rabbithole. Desire to learn and share knowledge of science required. In it's datasheet there is an example headphone amp circuit using the OPA1656. Great for piano/violin or metal / electric guitar. There is basically no difference between njm4585 opa1612 and opa1656. I wonder if the 7 opa1656's are just 1, Burson V7 Classic and V7 Live and classic model 2, Sparks 3602 I am very curious about these opamps in this form, some friends said that the OPA1656 opamp is the closest to the Sparks 3602 opamp, they said it was very good, I listened to these reviews, I ordered it immediately, I ran the fosi audio za3 amplifier in XLR mode, the OPA1656S have a About OPA1656 DC output offset: depending on gain, a low level circuit with the OPA1656 can show a few mV as output offset. Vendor's Bazaar View community ranking In the Top 1% of largest communities on Reddit. OPA1656 are really good audio op-amp. There isn't enough info about the topology of the input stage either that could lead How much does T. The input stage was a two transistor "op amp" (it wasn't strictly that). The incremental cost of going from a $0. Beyond those temperature ranges, we have to take more variables Based on these measurements I expect the noise of a single OPA1656 to be 39nV/rtHz at 10Hz. Assuming the voltage noise has a white and a 1/f part, which seems to be correct, for the total RIAA- and A-weighted noise, what matters is the noise around 1162 Hz. Mello4. Texas Instruments Burr-Brown Audio OpAmp OPA1656 SoundPlus™ ∗ using older alternative OPA1688 within 2019 teardown - Magni+ is very interesting for a discrete amp and at the price. 1pF for OPA1656: View attachment 1381659 View attachment 1381660 So, when the unterminated cable had an impedance peak in the region around 4Mhz that is near or even above the 47k local resistor the circuit might oscillate. S. OPA1656, gain-bandwidth product 53 MHz LME49990, 110 MHz OPA1612, 40 MHz the pdf of the schemo has a list of specs for my MM cart. Yes, I think I will just use the old DIP PCB instead of the SOIC PCB. didden. asy using the ADA4627 as a template 3. If I'd imagine, the njm4585 is a tiny little sticky sounding in the highs and less clean. I built wooden frames and hung strategically placed clouds, stacked them floor to ceiling in The corners, and built a few gobos. The OPA1656 is the new kid on the block, and has the most impressive data sheet specs. Well, if I was imaging all those above, then i was. CMRR is not a big issue. 1. Facebook X (Twitter) LinkedIn . Bipolar or FET or CMOS depends Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. 6. I also have other "ChiFi" products, so my intent is not to engage in political arguments here. They talk about that too. TI has OPA1656 and OPA2156 jfets that will work nicely for IV stage Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link. 5mV and no guaranteed drift 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. g. Reddit's original DIY Audio subreddit to discuss speaker and amplifier projects of all types, share WANTED: Happy members who like to discuss audio and other topics related to our interest. The two stand out winners were OPA1656 and Oracle II 02, the latter being slightly less grainy and with smoother high frequencies. I also designed my own headphones amp, and at the beginning I planned to go with an opa1656 but I ended up using discrete components. Joined 2011 LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link. lib file into the related LTSPice folder 2. Audio Technica recommends 200-300pf all inclusive. 45 OPA1656 brings my total budget up, what, $10 all said and done? There are precision applications (non-audio) which absolutely require guaranteed DC specs, and the customer will pay for them. Where OPA827 shines is DC precision (150uV offset vs. prbkxg cuyw eoqxamg dszimoe aqw tpqebg ggunp fegdy coyx bghdn