This is the follow up with more technical information, a summary of many popular op amps, and some of the measurements I made. Worse, these usually faster parts can easily be unstable in a circuit designed for a much slower part. Some of the differences heard could be high frequency instability. This article is all about measuring the results and putting some facts around the differences between op amps in a typical audio application. A complete op amp survey is at least several full weeks worth of work.
This rules out single devices, surface mount packages, and lower voltage op amps. While I did adjust the compensation and feedback impedance with some op amps, ultimately, the measurements are all in the same circuit configuration unless otherwise noted. So most of my evaluation was limited to what Mouser stocks. But I did test a couple parts from National and Analog Devices. Win or lose the video goes on YouTube and the story is published on this blog. And if you think the O2 is the weak link, please see: O2 Open Challenge.
See the O2 Design Process article for more. Used in high gain critical applications the rules can be different. Beyond that it mostly comes down to the specs and here are the highlights:.
This is to make sure that the amp does not oscillate when feedback is applied. In a low gain application, the amp might still show ringing on square waves due to the phase margin becoming small. This is usually compensated for by adding the correct value of capacitance in parallel with the feedback resistors from output to the negative input.
These capacitors cause a zero and a higher frequency pole in the feedback loop response effectively cancelling one of the amp's own non-dominant high frequency poles by placing a zero near it and replacing it with a new one at a higher frequency. This results in an increased phase margin, improved stability, and improved transient response. Like many things in audio it can be a delicate compromise say in an output stage with unknown external loads, or in a gain stage with two different gain options.
The only reason not to take a perfectly competent, and more comfortable, BMW instead is so you can be seen in your Ferrari. It turns out the following op amps find their way into headphone products for exactly the same reason— to be seen. It has very little to do with better real world performance or a genuine difference in sound quality.
Here are some of the elite:. The short list:. They offer no advantage over the above parts and are often much worse:. Overall I tested nearly two dozen op amps. So I then narrowed the choices down further based on price, popularity, and power consumption. For the output stage it was no contest, the NJM killed everything else. For the gain stage smk 5 bandung final list worked out to:. All the Op Amps were measured with the same 1.
Pin 7 was connected to a 10K pot yielding about a 1.Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing.
Print Search. Author Topic: What are the good general purpose audio op-amps these days? Read times. As the title says: What are the good general purpose audio op-amps these days? THAT makes many special audio chips including several mic preamp chips, balanced line drivers and receivers, dynamics processors, VCAs, etc.
The LM is a great low distortion audio op amp. Zero Super Contributor Posts: Country: It depends on what you want to do. The NE is still good enough for most applications. Plenty of new audio equipment still uses old op-amps such as the NE and TL because anything better is overkill and not cost effective. The NE is sufficient for systems with SNR in excess of dB, so it's still 'good enough' for audio and the like.
It is also very cheap and besides the NJRthere are few parts in the same price range with overall similar performance. They are overall very similar chips and should, in most cases, be interchangeable without much difference. The doesn't really perform better in terms of THD or noise, they are nearly indistinguishable.
NE, e. They have, however, higher current noise and cost ten times as much. Note the high bandwidth of these devices which leads to high open loop gain at audio frequencies, which in turn increases feedback and thus reduces THD, which is how they achieve the extremely low THD of these devices - high feedback and a very linear op amp to start withwhich means that you need excellent bypassing and careful layout ; these are "high speed devices" and somewhat prone to oscillation by insufficient bypassing or too high feedback network resistances which create too much phase shift with parasitic capacitances.
There are some other contenders, but most have, in usual applications, one or more important disadvantages over the So for the great majority of applications the is just fine, but as a bipolar op amp it's not well suited for high source impedances JFET territory.
All in all your circuit and it's layout and environment will matter much more than the specific choice of op amp, be it or or Mind you, be aware that you often can't just swap op amps, especially against faster ones, without adjusting the circuit.
Thre are several types of buffers, a famous one is the BUF, LT enz, Yes more expensive than de opamp itself :- With a buffer, you can use lower values your feedback resistors, this gives less noise and you also have less trouble with parasitic capacitances.
What you will use depends on whether you can pay the price of the buffer and the need for your design? There are so many ways to make it better if you want to get the last bit out of it. For the you actually don't need the fancy super-fast integrated buffers, a couple of transistors get the job done, too, with hardly any difference.
Looking around there's more practical options than I remember e. IIRC - and I'll have to double-check this - the main contributor to the NE's low phase margin is the compromise of internal compensation, correct? Hopefully all will come back to me when I start playing with one again And yeah, blackdog, the A version. I'd forgotten about the buffer trick too, even though I've used it in the past. Aside: I knew that op-amp swapping was a bit of an audiophool thing - but by God there's a lot of wankery about it out there!
Quote from: Richard Crowley on May 24,am. Quote from: dom0 on May 24,am. Kleinstein Super Contributor Posts: Country:. While the NE is still competitive today, there are better FET based alternatives to the TL07x series: OPAx and several similar ones with about halve the noise and still not that expensive.Latest Projects Education.
Which chip is better for preamp, Ad, opa, or ne? Thread starter Bigbizkit Start date Oct 31, Search Forums New Posts. Thread Starter Bigbizkit Joined Oct 29, Which chip is better for preamp Ad, opa, or ne? Is there any superiority in terms of producing bass sounds? Ad, opa, or ne? They all have the same pin config. Thank you so much masters Scroll to continue with content. What do you mean by "superiority in term of producing bass sounds"? All of these op-amps will perform equally well at low audio frequencies.
No one can give you a definitive answer regarding the subjective nature of perceived audio performance. Furthermore, the implementation is at least as important as the device so this is rather a meaningless question. Some people love the old NE and others prefer the newer devices.
Buy one of each and choose the one you prefer. GopherT Joined Nov 23, 8, The opa or OPa is generally better than ne but the question is rarely so simple. It is actually best to test them in the circuit. Not that the opa have much higher input impedence than the bipolar ne You must log in or register to reply here.
Chip ID after wrong charger plugged in. You May Also Like. Continue to site. Analog EFI using chip: A schematic and questions. Jun 21, General Electronics Chat. Jun 13, Bandpass active filter no output depending on chip.So what are the myths and facts?
Many gear manufactures tout op amp brands and part numbers in their marketing literature. But do they? Bell Labs filed a patent in and many consider the first practical op amp to be the vacuum tube K2-W invented in by George Philbrick.
Texas Instruments invented the integrated circuit in which paved the way for Bob Widlar at Fairchild inventing the uA solid state monolithic op amp in Which is better? It turns out, for nearly all applications for which IC op amps are suitable, they easily outperform discrete designs in the following areas:. One is a needing output voltages greater than about 8 V RMS.
And the same is true if you need peak currents much over about mA. There are some high current op amps, but they can suffer from thermal issues and are also relatively expensive. Driving speakers, for example, requires both voltages and currents that exceed these ranges. They also have thermal limitations and are limited to relatively modest power outputs. They also tend to have rather invasive protection circuitry due to their thermal limitations. But, very often, those grains no longer apply, or audiophiles apply them in ways that are entirely invalid.
The early op amps, like thewere rather substandard for some audio applications. It could barely reproduce intelligible human speech let alone do a good job with music. And it took several more years for the to show up in much consumer gear. The Cmoy headphone amp is just such an example. Typical op amps are made to drive loads of several thousand ohms or higher. Even the more powerful ones are often only rated down to ohms. And, not surprisingly, some of them audibly complain at their mistreatment.
If you compare overloaded op amp A against overloaded op amp B you may hear some differences in their highly distorted performance. Suddenly the two very similar cars behave very differently.No matter the industry specialized tooling is required to optimize performance. This is often overlooked in audio design where general-purpose IC-based op-amps are widely used.
Measuring At only 29mm 1.
PCM1794A output stage opamp measurements: LM4562, NE5532, and OPA2134
Compared to the V4 SS op-amp, the V5 requires less voltage and current. That means peak performance can be reached using less power. Its sonic signature is the most refined we ever created.NE5532 vs ±22V
We use the best components and make them perform even better with painstaking selection and meticulous component matching. Every Supreme Sound Op-Amp in the world right now, be they V1 or V5 is covered by our lifetime warranty, something, no other op-amp manufacturer dares to offer. Below is a recommendation of where to apply our opamps. It is a general guide only so please feel free to contact us regarding your particular project. Supreme Sound Opamp V5.
Designed to optimize audio performance. The Best Upgrade is also the Easiest Upgrade. Unsurpassed Performance Driven by Passion and Refined over time.
Unsurpassed Quality. Featured Customer Projects.Personal experience I would like to share with those who into audio electronics DIY. It is actually an old thread I started last year in Sgheadphones. When I saw it has been viewed more then times by SeptemberI think it is good to share it here as well.
Which chip is better for preamp, Ad8512, opa2134, or ne5532?
And this is the Original Thread. So, I tested them with bright, lively sounding, and very revealing headphone.
And for my taste of music, vocal is very important. I like thick and warmth midrange. There is no exact measurement to describe how audio equipments sound.
All measurements are subject to personal tasteso this Op-Amp comparison is only a sharing of my experience with those Op-Amps, with hope there will be readers benefit from it. The treble sounds a bit too dominant. Very good detail and imaging.
I love the transient and impact of the AD My only complain with this Op-Amp is the treble, a little bit too sharp, and the color tends to the metallic sound. The good : Bright, very good detail, lively sounding, the most transparent sounding so far. The bad : Treble can be sharp and harsh with bright headphones.
Application: Not to be paired with bright headphones. You might get ears fatigue. Probably good for Senns, but not for Grado. I still can enjoy it with my RS-1 though, but only for certain recordings. Very good detail and resolution will reveal recordings flaw. So, this Op-Amp is only for good recordings. Not bright, veiled, with poor detail.
There is no way you will get ears fatigue with this Op-Amp, but you might get bored. It is not a lively sounding Op-Amp.
Some people might like it. The good : Sweet, warm, never sound offensive, good for long hour easy listening. The bad : Poor detail, veiled, mellow, far from lively. Application: To be paired with very bright and lively sound headphones. For those who like long hour easy listening, this Op-Amp might be the choice. As it will hide many details, it might be good to listen poor recording with this Op-Amp. I like its treble. Not too bright, just nice.
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The many versions of the NE5532 and I'm confused!
Joined Jun 22, Messages 2, Reaction score Joined Jun 22, Posts 2, Likes Suggestion- Measure the power supply voltage. I made that mistake and almost burned up a pair of AD chips.
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