OPAMP rolling

Discussion in 'DIY' started by JoshMorr, Mar 14, 2016.

  1. Cspirou

    Cspirou They call me Sparky

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    Does it really need such a big LED with all those SMD parts already in there?
     
  2. AllanMarcus

    AllanMarcus Friend

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    I think the LEDs are to limit the current. LEDs are good for that.
     
    Last edited: Feb 24, 2019
  3. Cspirou

    Cspirou They call me Sparky

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    Not questioning the use of a LED. Just that I'm sure they could have used an SMD LED that fit the specs.
     
  4. AllanMarcus

    AllanMarcus Friend

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    Here's a discussion of that exact question (what two the LEDs do?( I think this is the summary:
    https://www.audioasylum.com/cgi/t.mpl?f=tweaks&m=207049

     
  5. purr1n

    purr1n Desire for betterer is endless.

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    And this is why I dislike Burson as a company. Repacked opamp with a few more parts in a tin box. $5 BOM. Sold for what? $40. $50, $70? It's not right to take advantage of audiophiles, even dumb ones. At least Audio-GD, who charges $25, needs to hire people to solder all the discrete parts of their discrete opamps.
     
    Last edited: Feb 24, 2019
  6. Zampotech

    Zampotech Friend

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    I absolutely agree with you.

    I will share my experience in manufacturing discrete operational amplifiers.
    In 1987-89 at the University I did a study on the topic "Noise-like signals". Now it's called CDMA. My task was to develop and manufacture a receiver with quadrature signal processing. It is essentially a high-speed analog computer with parallel processing of information. Operational amplifiers then represented "sad shit". I had to make a lot of discrete operational amplifiers. I took the developments from the journal of practical physicists " Devices and techniques of experiment".
    My discrete op-amps worked better than the integral ones. But that was in 1989. But now, modern op-amps are two orders of magnitude superior to my discrete op-amps.

    You can make a discrete operational amplifier that exceeds the integrated operational amplifier by one or two parameters. It is almost impossible to produce a discrete operational amplifier with parameters exceeding all the parameters of the integrated operational amplifier. Or this amplifier will be the size of a good concrete cinder block.

    But of course, discrete elements can improve the parameters of the integrated operational amplifier. They can even turn an operational amplifier into a sound monster.

    We once used are not primary, and intermediate output from the standard operational amplifier. The output stage was made discrete. As a result, we received an increase in speed by 8-10 times (now I do not remember exactly), a reduction in distortion and an increase in the output voltage.


    Photo from my workbook, the workbook was written in 1985-1989. How to reduce the distortion of a conventional operational amplifier almost 100 times.

    [​IMG]
     
    Last edited: Feb 25, 2019

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