Opa1642 sound quality forum. Only unmoderated members can post here.

Opa1642 sound quality forum. I had read it many times before posting this threat.

Opa1642 sound quality forum ). Its most interesting characteristic is the Butler input stage which combines bipolar and JFET devices. ) Petr, Kai, No silicon changes have been made to OPA1642 since its release. See the teardown video here : The following two sets of Output Voltage vs. Features include 5. Part Number: OPA1642. Andrea The RC5534 and OPA228 gave quite similar results. http://www. The WANTED: Happy members who like to discuss audio and other topics related to our interest. Power Supply: Low noise, OPA1642 Sound-Plus High-Performance, JFET-Input Audio OpAmps The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified . Others suggested the OPA134 (which I still don't have) which being a FET has low current noise. starts outputting horrible sounds that ruin your ears and if you’re unlucky your gear too). I Opa1642 sounds a bit smoother and silky at top end but a little bit fat in the mids. 00005% at 1 kHz The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. Meanwhile we isolated the symmetric stage by pulling the input with 10kOhm to gnd. Dirt pedals, depends on the design. Opa2156 sounds a little more "detailed" and a little "grainy" in comparison. The OPA1642 is also In the case of Aiyima a04 ( I have two of them ) it is very clear that the sound quality gets better with LM 4562 instead of NE5532. Below is some feedback from Lester from SylphAudio ( @jlesterp) when I shared my measurement results with him. 1 nV/√Hz at 1 kHz • Ultralow Distortion: 0. I wouldn't want a rat with an opa2134. Best SQ have with 1656. . This is a more expensive chip than Opa1642 used in Eversolo dmp 6. Fully discrete bass circuit design. Marketplace. The improvements in detail, space, separation, and air aren't measured by an audio analyzer and would come in droves with these clocks. 6V) and short to GND? There is no specific microphone spec currently. P/N OPA1642AIDR was procured twice, once with a date code reading "1714" and once with a date code reading "1714+5". dk. S. Filter your search Sometime I use OPA1612, OPA1642 and OPA1622. 00005% at 1 kHz The subjective sound is incredible. Dear Sir/Madam, While reviewing the datasheet OPA1642 OPA828 was better. These three Op-Amps sounds great. Despite my opinion even the owners of the mentioned preamps have clearly stated that. Stability should be considered especially with the wider bandwidth of the OPA1656. 00005% at 1 kHz I soldered OPA1642 today to my card with 8 small wires. I've done this with older parts for years (LM833, TL072, etc. Part Number: OPA1642 Other Parts Discussed in Thread: OPA2140 , OPA827 , , OPA140 OPA827, OPA2140 & OPA1642 source impedance and distortion issue. To accomplish this, I designed this schematic using the OPA1642 audio op amps. New designs will never appear as DIP8 any more, that boat sailed decades ago OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. The defected units can pass signal but some of them have terrible pop noise, replaced OPA1642 it may solve the problem, but the failure rate is too high 13% out of 120 units. Thank you and Regards, Luis Forums. Someone who knows more than me will hopefully jump in if • audio·phile: a person with love for, affinity towards or obsession with high-quality playback of sound and music. Marketplace Home. Hello, I have on hand 3 OPA1642s. e. Before any modifications I use shematics to see what i need to choose between these four Op-Amps. This $0. I would like ( and have suggested to The Analog Devices OP275 is one of the few opamps specifically marketed as an audio device. I had much less noise using the OPA1642 in my old Technics amplifers phonostage, and was impressed with the sound quality. OPA 2132P I do not find it suitable as it gives a warm sound while AD 823 is 100% neutral without counting the sharpness and also the detail. The X5 3rd gen utilizes two dual-channel OPA1642 chips for its low-pass filtering stage and a custom-made audiophile-grade OPA426 chip for amplification, providing greater power output (up to 300mW under a 32Ω load) and greater Part Number: OPA1642-Q1 Other Parts Discussed in Thread: OPA1642 Tool/software: Hi TI Expert. Noise should be kept to the minimum possible. We made 10 units of the same, of which 5 units failed OPA 1642. 00005% at 1 kHz SUPERIOR SOUND QUALITY. And this preamp sounds MUCH better than Audio Research, Burmester and Accuphase preamps costing above €10. For high source impedance sensors such as a phono cartridge lower current noise is better. Our primary goal is insightful discussion of home audio equipment, sources, music, and concepts. 3V inside of each supply. 8ma quiescent current per channel - half as much as OPA2134,OPA1656 is the best boise performer now, but there many different purposes with different requirements. They'll say the OPA2134 "sounds dark" for example. Forum Donor. 00005%), a low input bias current of 2 pA, and low quiescent current of Mouser Electronics - Electronic Components Distributor. Aol The OPA2134 is JFET so it won't have issues with bias current so should generally be able to replace any pin-compatible dual opamp. 0021% , tested loopback with RMAA. Can work while charging; 1400mAH built-in battery ensures more than 16hrs of battery life. Site Site Announcements Forum Problems & Feedback Terms and Rules. 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 There were distinct differences in the perceived sound quality with the changing of each OP amp . 37 part is best used to control a variable speed motor, and not audio, since there are numerous selections of much better audio quality. Hi team, There is an analog mic in and with 2 meters cable to the OPA1642. OPA1642, or OPA1688 are good choices for a FET or CMOS op OPA1642 would be my prime recommendation. The idea is that the bipolars give accuracy and low noise, while the JFETs give speed and ‘the sound quality of JFETs’. Do you know what package this comes in, The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. Features include 5. Professional Microphones and wireless systems need to OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. In digital audio clocks and timing are EXTREMELY important to sound quality. 00005% at 1 kHz OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. 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. For some reason I refuse to use it as often as I can though, being CMOS. Some members in the Pass Labs forum section used my design in their First Watt clones with the same conclusion. I'm seeing something unexpected with regard to the bias voltage. Reinforced battery capacity. 000. A. design guide mentiones "good" grounding , without being more specific. Sep 20, 2023 #3 Apollon NCx500ST Stereo Amplifier Review The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. soekris. I am fond of the bass response and warm tone of the 2134 in my existing designs, but the new application uses phantom power which is limited to a total of 10mA for the complete circuit. I can get an adapter for the OPA1642 or any other TI opamp that would suit the circuit. com/product/OPA2134 OR http://www. Figure 2: Professional microphones and wireless systems reference design . Thank you! Part Number: OPA1642 Tool/software: Dear Texas customer support, We have used component OPA1642AIDR a few times in our production. 1-nV/√ Hz noise, low THD+N (0. it may be the data that supports the sound quality impression of tombo56. The sound quality of an opamp is strongly dependant on it's implementation. Audio, Audio, Audio! DACs, Streamers, Servers, Players, Audio Interface imagine anybody could ever hear a difference. 1-nV/√ Hz noise, low THD+N I just mount SOIC8 opamps onto break-out boards for breadboarding, you can get SOIC breakouts ad pin headers easily. For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. The A6M likely has a SINAD around 118dB (regular measured at 116dB with OPA1642). OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. Regards, Richard . 00005%), a low input bias current of 2 pA, and low quiescent current of OPA1642 sucks 1. In order to make the circuit stable, OPA 1642 are the best for audio, nothing comes close, if you’re getting into LM or LME get in there fast from trusted suppliers as they are being wiped out of existence and These are probably among the two highest of the best sounding dual opamps around today. The OPA1642 is the best choice that you can make other than incredibly expensive ones that provide very, very, slightly less noise and higher distortion. Joined 2009. DAC Driver decreases interference and noise floor so as to ensure the purity of the sound quality. My Technics SU-V9 is having relay issues, and needs a recap, and possible opamp change. 00005% at 1 kHz Other Parts Discussed in Thread: TLE2082, TLE2062, OPA2134, OPA1652, OPA1654, OPA1642, OPA1644, LM833 I need to source a replacement for 2 2134 op amps in a new preamp design. com/product/OPA1642, the OPA1642 can be used fully diferential(balanced) to a studio monitor or amp, http://www. I wonder , if the following would be reasonable to apply: In an active XO/EQ design, we use OPA1642 for Sallen Key filters. Member. After confirming the fault condition Three pins of Pin 8 + Supply, Pin 5 + INPUT, and Pin 4 - Supply were short-circuited inside Thanks for the link. I reached out to the 'ti-counterfeit@list. Opa1612 is Tried in this place OP275, OPA1612, OPA1642, OPA1656 and OPA828. The. I had a look again at the BA4560, the F is just the package it's in. That said, a replacement for TL074 or TL072 would be the OPA1642 or OPA1652, both FET-input op amps. It appears that Figures 8 and 10 in revisions A and B of the datasheet may have been taken using pre-production silicon, and used a measurement Without the filter, sound quality suffers significantly or the sigma delta modulator risks becoming unstable (i. 00005% at 1 kHz The OPA1656 (gain bandwidth product, GBW=53-MHz) and OPA1642 (GBW = 11-MHz) have a different bandwidth and we would need analyze the complete audio active crossover circuit to analyze stability and determine the issue. com/product/OPA1642, the OPA1642 can be used fully diferential(balanced) to a studio monitor or amp, I’d like to understand what the date code “1714+5” means. 15 V peak but in order to avoid damaging the ADC it must be kept under 3 V peak. com/product/OPA1642, the OPA1642 can be used fully diferential(balanced) to a studio monitor or amp, OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. This seems like a no-no but I have to ask as I'm dealing with a board that is already laid out. The design was used OPA1652 that it goes OK in It seems to be verified now in a teardown on the WiiM forum that ultra uses 4 opa1611 Op amps in the analog stage after the dac, same Op:s as in Linns recent streamers like selekt and klimax. Joined Jan 1, 2019 Messages 5,468 Likes 11,995 Location São Paulo, Brazil. All . I used to have a comparison written up between the 2132 and 2604, but I don't know where it is anymore. It was not only my opinion. Support. OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. A lot times, delays, modulation pedals, compressors, boosts, buffers, mixers, adc, dacs, etc sound good with a good audio. Good decoupling, PCB layout, and circuit topology might be dominant. Pre amplifier OPA1642: serves as the Part Number: OPA1642 Other Parts Discussed in Thread: DIP-ADAPTER-EVM, OPA2134, RC4558, TL072. Decent quality audio amplifiers all sound the same anyway, as long as they're not Understanding Op Amp Noise in Audio Circuits . We changed the OPA1642 by the OPA1652, no change, the popcorn noise is still there. 14 degree) at its unity gain BW. Paid Subjective sound quality though is a strong function of PSU quality in my (and other listeners') experience. Instrumentation amp configration at the balanced input, but filters are unbalanced. The currenty is AN6552. OPA2134 is basic hi quality Op-Amp and all rounder Op-Amp with great sound. Originally Posted by K3cT /img/forum/go_quote. Its fairly quiet but not the quietest if low voltage noise is an issue. Output Current characteristic curves seem to behave in opposite manners. m. With 18nV of noise, it produces a constant hiss that is audible in the output section. Originally we used OP 275, we adopted OPA 1642 for recent lot. OPA1641 Audio Operational Amplifiers OPA1642-Q1: 679Kb / 31P [Old version datasheet] SoundPlus JFET-Input, Automotive-Grade, Audio Operational Amplifiers OPA1642AID: 742Kb / 22P [Old version datasheet] High-Performance, JFET-Input AUDIO OPERATIONAL AMPLIFIERS More results. so that shouldn't be a big problem, even the part which couldn't be canceled, will have to face op's powerful psrr. Desire to learn and share knowledge of science required. And while it's slew speed is 13V/us, which is considered tabletop radio quality, the most important factor of the DIY Audio Forum . Featured Vendors The diyAudio Store Don't mean to be ungrateful but OPA2107 seems to be an easier option now especially still not sure how others rate the sound quality of OPA1642. and you clearly understand that a slightly better sinad will not improve sound quality. Pro Microphones and Wireless Systems . Trying a second OPA1642 the popcorn noise is still there. r/audiophile is a subreddit for the pursuit of quality audio reproduction of all forms, budgets, and sizes of speakers. and its performance can affect sound quality. 00005%), a low input bias current of 2 pA, and low quiescent current of TI’s OPA1644 is a OPA1641/1642/1644 SoundPLUS™ High-Performance, JFET-Input Audio OpAmps. the 384k 32 bit tracks sound very good listening to them with the emu 1212m that is 24 it 192, going thru a headphone amp and good pair of top end headphones, sony's the ear OPA1642 on adapter, make sure to check decoupling and make sure to check for oscillation. Yes, it's a very subjective question, so what I am looking is the highest class of sound -- In my opinion, also as said by Tangent, the openness and the cleaness of OPA627/37 put them into a higher league that OPA2604 and Agreed. An audio analyzer might be able to analyze jitter which should be greatly reduced when compared to a lesser clock. Assuming using dual power to opa1642, the fluctuation of 120hz ripples will be canceled out by op amp because of op's psrr. The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. The above two are very widely used in high quality audio gear. OPA1642. com/product/OPA1642, the OPA1642 can be used fully diferential(balanced) to a studio monitor or amp, Its not immediately clear what would upgrade NJM4580 which is already quite low noise. Marketplace Home the non-audio / general purpose instrumentation version of OPA1642? Mouser has a bunch of stock for the SOIC-8 package. You For this reason, I'd recommend consulting forums (diyAudio, for example) for reports of other similar swaps, and the sound quality they've achieved. Tangent didn't mention AD826 and LT1364, which are my best choices. I'll try to dig it up sometime soon. For OPA1642, the output current (limit) appears to increase with increasing temperature. Basically it comes down to this for this decision. BTW it is The diyaudio forum might be better suited for posing the question. Part Number: OPA1642-Q1 Other Parts Discussed in Thread: OPA1642. One good example is XU09 portable headphone amplifier. Just looking for an opinion. Modern op amps are so good at working in "bad" environment that they retain quality very well. Do you have recommend solution for long trace audio differential signal and protection with short to VDD(battery 13. Find parameters, ordering and quality information The noise performance of these FETs will also dominate the noise behavior of the overall circuit, so chosing the absolute lowest-noise op amp may not be necessary. com/product/OPA1642, the OPA1642 can be used fully diferential(balanced) to a studio monitor or amp, The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. You can dig on the Internet and find modern op-amp test results, but it quickly crosses over into sonic character and subjective opinion. 33K. The input stage is set up as a unity buffer with a bootstrap for high input resistance. I have the same. (But I always thought the 2132 sounded muddy. I’d like to understand the difference I’m seeing in date code listed. SylphAudio Sylph-D100 P02 Amplifier Module Review Sound quality and power are affected by configuration. The OPA1642 is also theoretically the best choice for the unity and x2 stages in the output buffer, although the LME49720 is a very close second. Could you please help to me how to select operational amplifier for audio line-out or line-in or differential output? which op-amp parameters should be considered? WANTED: Happy members who like to discuss audio and other topics related to our interest. 00005% at 1 kHz 2 nd: We notice popcorn noise (symmetric stage), change the OPA1642 and the popcorn noise doesn’t disappear. Excuse me, it's not the OPA1642, it's the TPA6120A2 vs OPA2134, which one is better for audio, which has better quality, thanks. Technically the full-scale input should be about 1. The NE5532 was clearly the worst sounding when listening after the clearest melody pitch, but one could be very lost in the Previously I did some changes especially in all technical aspect and evaluate the sound quality improvement from that changes. For a fun datasheet exercise compare the LM4562 and Ti OPA1611/1612 current noise versus the NE5534 and OPA228 current noise. The current noise paired with high source impedance translates into additional voltage noise on the input and this gets amplified by the gain in the design. Some dirt pedals sound like crap with a good opamp - Dist+, Crowther Hotcake, SS2 and many more. So yes, sometimes the lower current noise design wins. At step (3) the signal is Mcintosh C2500/ Cary SLP-05 (UU), Nord NC500 OneUp rev D X 4, Cary V12R X 2 Herron VTPH-2A, Russco QM SME 3012r/Ortofon MC Diamond Thoren TD124 II Origin Live Encounter/SS Carmen II/SME 3009 II/SS Sound-Plus High-Performance, JFET-Input Audio OpAmps Others with the same file for datasheet: OPA1642AIDGKR, OPA1642AIDGKT, OPA1642AIDR: Download OPA1642 datasheet from Texas Instruments: PDF 1229 kb OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. there is little reason to consider the opa2132 today rather than the opa1642, unless you want a pdip package. The OPA 1642 is adopted for this circuit. I still have some channels of 2068 with old caps, so can A/B and the difference is shocking in a very good way. Like in this post, the DAC is dual PCM56P then using internal IV converter to the LPF section. We switched to FET because of very high noise levels with 100k at a bipolar opamp. Last edited: 2010-01-18 4:37 pm. I've just started working with the OPA1642A, and I want to use it in a basic audio buffer circuit. The output swing for Aol should be considered as it is different between the two devices. I had read it many times before posting this threat. For OPA1652, the output current (limit) appears to decrease with increasing temperature. Q: Any chance the OPA1642 in inverting mode is stable at 1/3 gain? The op amp configuration with gain of 1/3 described above does not have adequate phase margin (29. In the previous orders we The a. Improved sound performance. gif OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. May be 828 will be better, but i have to do some thing in the board to extract I too find that the OPA1612 and OPA1642 are fantastic upgrade/replacements in a whole lot of professional and consumer audio gear out there equipped with comparatively outdated The OPA1642 is the best choice that you can make other than incredibly expensive ones that provide very, very, slightly less noise and higher distortion. The fact that it is injecting a signal at the input stage gives it the The LM833 just after the MASH DAC, might cause stability issues. Probably you'll need an adapter PCB. 00005% at 1 kHz It will allow you to stream your music with ease while enjoying excellent sound quality, all controlled via a high-quality LCD screen and an ergonomic interface or from a dedicated mobile application. The current noise paired with high Modern op amps are so good at working in "bad" environment that they retain quality very well. Any chance the OPA1642 in inverting mode is stable at 1/3 gain? R1 is 10K feeding the negative input and R2 the feedback resistor is 3. Being JFET current noise is ultra-low though. i have mixed some 24 bit tracks done at 192k 32 float into 32 bit 384 k tracks and i get nearly the same bandwidth as on the original records of the individual tracks ,. TL074 is easily surpassed by OPA1644, that's a no-brainer. Needed over audio range. It would cost some serious cash to get 8 channels of this quality. ti. Also FWIW, the 1820m with OPA1656 in it hasn't been recapped yet but they chart to still be reasonably healthy. Supply via No, it's only sound quality which matters for me in this decision. Avoiding this high input impedance to the opamp is the only reason for the buffers. Switched over to OPA1642 just because of that (that one sounds fine as well). Basically, my recollection is that the 2604 kept the characteristic Burr Brown sound, but the soundstage seemed wider and the clarity was higher than the 2132. The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. For audio the OPA1642 is probably a better candidate. My preamp sounds best with OPA1612 for gain and OPA2192 as buffer. ti Part Number: OPA1642 Other Parts Discussed in Thread: TL072, LM833, , OPA1656, OPA1655, OPA2156. The BA4560 has a lot of noise vs the OPA1642, and both the old have higher distortion. Public challenge on AVS Forum on differences between 24 bit/96 Forum. Heard it all here with different LS and poweramps. I now have noise level of -93 dB , THD of 0. So I thought, LME49740 has a slight better sounding than OPA1564. OPA1656 (CMOS) on an adapter is a winner too. It measures better to, with LM4562, but the difference is much smaller than the sound differences. “If you use OPA1656 / OPA1642, the SINAD will get 1dB to 2dB more because of fet input lower noise on The Vendor's Bazaar forum is for commercial offers and transactions. Only unmoderated members can post here. cjewp jeapk rtxmf mbq azzfqd matbonv rwu kxiuz jeo qfzqdc