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Thread: DIY amp build: Done with the headshell ..now comes the tough part :p

  1. #61
    Braindeadologist GoldenVulture's Avatar
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    Default Re: DIY amp build: Done with the headshell ..now comes the tough part :p

    Quote Originally Posted by Phantasmagoria View Post
    Board with a rotary pot (C 50k), IC, input, ground, output & +12V DC connections
    What's the IC and what's it do ?
    I'm presuming that's where your gain is coming from. Most OP amps output level can be set by a couple of resistors. Depending on the values , sets the gain factor , from unity gain to what ever the chip is capable of.

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    watch where you point that sword Phantasmagoria's Avatar
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    Default Re: DIY amp build: Done with the headshell ..now comes the tough part :p

    The IC is pretty small and I can't tell if anything's written on it..it's square-ish with 4 pins coming out of either side that's all I can say about it

    EDIT: OK, apparently my son's eyesight is a hell of a lot better than mine

    Here's what he said he saw on the chip: 022BA04GJRC
    Last edited by Phantasmagoria; Today at 04:21 AM.
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    Braindeadologist GoldenVulture's Avatar
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    Default Re: DIY amp build: Done with the headshell ..now comes the tough part :p

    Quote Originally Posted by Phantasmagoria View Post
    The IC is pretty small and I can't tell if anything's written on it..it's square-ish with 4 pins coming out of either side that's all I can say about it

    EDIT: OK, apparently my son's eyesight is a hell of a lot better than mine

    Here's what he said he saw on the chip: 022BA04GJRC
    OK, that probably translates to JRC022 [equivalent NJM022] which is a dual op amp.- https://www.google.com/url?sa=t&rct=...Br2XPiY_DRm5_A -

    I don't know if you can get your head around this.
    - https://www.radio-electronics.com/in...ifier-gain.php -
    But if you can grasp the basic formula here , then use it to deduce what your boost circuit is doing you may be able to change the gain factor.
    - https://www.youtube.com/watch?v=4M4H-aLvIoA -

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