Opa134 vs tl071

Audio electronics and High End Hifi are also absolutely "on-topic" here. All pictures on this site except the schematics are Copyright Dada Electronics.

You can use them after a written agreement via e-mail with the author. For Contact-information see www. View my complete profile. Dada electronics is proud to anounce the 44 upgrade-kit and revision-service. The problem with the 44 is the fact there are different versions. Some versions used dual TL opamps, other version used single-opamps. See the data-sheet for more info. The opamps are very stable, they reject HF feedback and they are designed for audio.

At the voltage-level and the amplification-factor in the 34 or 44 they perform better than teh more expensive OPA and They are also less critical for the power-rails. The following products will be available in the Dada Webshop next week: Quad 44 upgrade Quad 44 upgrade-kit Stefaan The following components are replaced in the 44 depending on the version and the configuration : On the PSU-board:.

Contents of 44 kit e. Can't find anything on www. Ik heb Douglas Self eens gevraagd of het zin had die opamps in mijn 44 te vervangen, zijn antwoord, nadat hij het schema van de 44 bestudeerd had; 'I can only conclude these TL opamps are not being well used. The huge-value resistive attenuators on the inputs will degrade the noise whatever opamp you use.

Hallo, Herman, Dan zou je het verschil eens moeten horen! In 30 jaar is er heel wat vooruitgang gemaakt in het ontwerpen van audio-opamps, geloof me vrij.

Bij de "Radio" input heeft men geen serie-weerstand en een 1M weerstand naar de massa.

Ne5532 current draw

Het gevolg van de design is dat men een zeer hoge ingangsweerstand heeft hetgeen uitstekend is bij het gebruik van eender welke input-bron.

Moderne chips kunnen de zeer lage signaalspanning best aan. Men mag PW niet onderschatten hoor! Ik ken die Douglas niet maar blijkbaar heeft hij nog niet naar een 44 met OPA's geluisterd. Hello Stefaan!

All the modifications you suggest in this upgrade are higly valuable and do improve a lot the sound. I would suggest another useful mod : replacing the WEAK 7. Hi Stefaan, I am delighted with the fantastic improvement to my with the Dada upgrade package… In the mean time, I am very interested in doing something to bring my 44 pre-amp back to life.

I have emailled a few photos of my 44 which is Serial Number as you mention on your web-site that 44s came in various states of modification over the years of manufacture. I guess these would benefit from being changed along with some of the capacitors.

As you will see in photos some of the capacitors the red ones… have leaked a bit like the ones in my !It's usually not a matter of choice. In most cases, the load capacitance is not from a capacitor you've added intentionally; most often it's an unwanted parasitic, such as the capacitance of a length of coaxial cable.

However, situations do arise where it's desirable to decouple a dc voltage at the output of an op amp-for example,when an op amp is used to invert a reference voltage and drive a dynamic load.

In this case, you might want to place bypass capacitors directly on the output of an op amp. Either way, a capacitive load affects the op amp's performance. Op amps have an inherent output resistance, R owhich, in conjunction with a capacitive load, forms an additional pole in the amplifier's transfer function. We can view instability from either of two perspectives. Looking at amplitude response on the log plot,circuit instability occurs when the sum of open-loop gain and feedback attenuation is greater than unity.

The closed-loop bandwidth of a voltage-feedback op amp circuit is equal to the op amp's bandwidth product GBP, or unity-gain frequencydivided by the circuit's closed loop gain A CL. Phase margin of an op amp circuit can be thought of as the amount of additional phase shift at the closed loop bandwidth required to make the circuit unstable i.

In order to maintain conservative phase margin, the pole generated by capacitive loading should be at least a decade above the circuit's closed loop bandwidth. When it is not, consider the possibility of instability. First of all you should determine whether the op amp can safely drive the load on its own. Many op amp data sheets specify a "capacitive load drive capability".

Others provide typical data on "small-signal overshoot vs. In looking at these figures, you'll see that the overshoot increases exponentially with added load capacitance.

If possible, keep it well away from this limit. Also notice that this graph is for a specified gain. For a voltage feedback op amp, capacitive load drive capability increases proportionally with gain. So aVF op amp that can safely drive a pF capacitance at unity gain should be able to drive a pF capacitance at a gain of A few op amp data sheets specify the open loop output resistance R ofrom which you can calculate the frequency of gain-the added pole as described above. The circuit will be stable if the frequency of the added pole f P is more than a decade above the circuit's bandwidth.

Tone Report Weekly Issue 153 - Page 30

If the op amp's data sheet doesn't specify capacitive load drive or open loop output resistance, and has no graph of overshoot versus capacitive load, then to assure stability you must assume that any load capacitance will require some sort of compensa-tion technique.

There are many approaches to stabilizing standard op amp circuits to drive capacitive loads. Here are a few:.Posted by RBrezins i on January 09, at Hi, I'm using a Quad 44 for some time now and I'm quite happy about its performance.

However, I would like to upgrade some components in the pre-amp just for fun and thought it would be best to start with the op-amps. Further it uses at least four TLCP's at the amplifier circuit board. I did some research and narrowed my choices down to three different Burr-Brown opamps. It would be possible to use the OPA on the input cards because pens 5 and 8 aren't connected. This is not true for the amplifier board. Well, my question is, which of the three opamps would be best?

According to the specs I would choose the OPA, but this one is much more expensive than the or So maybe I should choose the for the phono input card and use 's for the other input cards and amplifier board. I ask this because I'm not an electronics engineer and don't have much knowledge about opamps.

One more question about the TLCP. There are two lines on top of this opamp. Does anyone know what this stands for, is this just a date code?? The lettering font of the opamps on the phono card is also a bit different than on the tape card. I don't want to bother you all too much but does someone also know for a better replacement of the CDB solid state switches? If anyone knows more modifications for a Quad 44 orplease let me know.

Feel free to email me. Can anyone also provide me with a link where I could buy the above opamps online? Thanks in advance!! The is a superior op-amp, but the sheer bandwidth and current draw will likely pose problems.

Need Help Audio Preamp Circuit

The second line is indeed a date code. First however I did the two regulated supplies for these op-amp's. That open up the sound a lot!! Then I replaced the op-amps with AD's and 's.

These are pin for pin and very low offset. DC spec's are way better than the old op-amps too.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 dwigraha yoga 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:.Hificollective uses cookies to give you the best online experiences. By continuing to use our website you are agreeing to our use of cookies. Welcome to Hificollective, to create an account please register here.

Most signal sources and many power amplifiers use operational amplifiers, as their main active component, being used for amplifying, filtering and impedance conditioning of siprec server audio signal.

This means the audio properties of these OPAMPs have a powerful effect on the sound of your audio appliance. This tells us that the technical specification alone is not the defining factor for sound quality. But today it is in debate if even these very expensive chips are really capable of getting the best sound out of your CD player, DVD player, preamplifier or power amplifier. Therefore low open loop amplification is possible, leading to natural, relaxed sound with a very high detail and perfect tonal balance.

The circuit implies current mirrors, which are implemented with ulra low noise green LED's. This gives the amplifier very good low noise performance. This gives our module the best possible stability under all real-life uses, and also gives improved protection against static electricity.

Bipolar transistors also tend to sound cleaner and more dynamic than FET's in the input stage. It's based on brand new technology, which will provide world class sound performance in your existing product. Compared to other existing products this module is made with low inductance non magnetic components, and a special high-speed circuit with extremely low THD 0. Current mirrors are made with the lowest forklift brakes locking up LED references.

Resulting in a clean and coherent sound experience, with complete 'black background'. Therefore we placed pads for mounting optional decoupling caps on the module itself, in case some CD players had poor decoupling on the motherboard.

However our real life tests now show, that because of the relative low open loop gain, the OPAMP is stable even with very poor decoupling. With up to 60 cm of wire between the module and the nearest decoupling cap, it's still stable. That lead us to a decision to remove the local decoupling caps in the next production batch, in order to free up 8mm of space on height above the motherboard.

Should you wish to add local decoupling caps, this is still possible by placing them under the motherboard.Forums New posts Search forums. Best Answers.

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For most series ICs if you cannot get data with full code, try the generic type like What are the really good opamps for audio, that don't cost stupid money and are available in DIPs not just SMD?

cvnn.eu › questions › is-there-any-real-world-differe. And what other op amps would you recommend that would be a 'direct' xnxx pro2 for TL instead of OPA (I don't plan to spend big so it should be on. The jump from TL to OPA will be more significant than any the pressure off will not benefit as much compared to those where it is. Hi all, I hope this is the right place to post this. the stock circuit has TL which I since replaced with OPA and TL which I.

LM/TL/TL The OPA is a specialized high performance Audio OPAMP. LM and the other ones are old and of low performance. I have a DIY made guitar amp in which there is a TL preamp section.

I'm quite confused – would upgrading TL to OPA make a distinctive. Then I repeat the test for V into Ω. The amp is powered from a Spec-wise, this chip is somewhere in between the OPA/ and the OPA to no avail.

Analog Devices AD823

when i drop-in an OPA or LM, i put.1uf ceramic caps from pins 4(V-) and 7(V+) to the earth(pin 5 of main pcb). opa Any other possibilites and any reason why some may be I have also tried OPA, and didn't like the sound (compared to the ). Take a look at the LME data sheet and compare each line item vs. the same on the TL sheet. Much better in terms of audio parameters. Buy Juried Engineering OPAPA OPA - Mono HiFi SoundPlus High Performance Ultra Low Distortion: % and Wide Supply Range: ± V to ±18 V.

Modern jelly bean replacements are the TL/TL/TL and OPA/OPA Not much of an improvement. Compared to an OPA I would recommend OPA or OPA and if you have money the OPA •Avoid input values below 4 V to prevent degraded VIO that results.

to replace the TL with a better audio opamp such as OPA To me, op-amp versus BJT for an output buffer is more a matter of. I did some research and narrowed my choices down to three different Burr-Brown opamps. I chose the OPA, OPA or OPA Pen 5 and 8 from. L V. Voltage Selection: 1. Remove Fuse Holder. 2. Exchange Fuses of more than 8 dB compared to the TL at 30 V — in terms of sound pres.

Slew Rate: V/μs (Most widely loved RAT op-amp; Slew Rate: V/μs TL spec TL); Slew Rate: V/μs Burr Brown OPA NE (Common hi-fi. All TL/2 replaced with OPA/ - no change to performance on line inputs. Modest noise reduction via Alter output level to v. I been trying to find a TL preamp circuit.

I will be using V for my supply voltage. ronv suggested a OPA looks good.