This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Tuesday, August 21, 2018

Maxon CP101 Compressor

Stumbled across the schematic for this compressor and couldn't find a layout for it. So I drew it up. This follows the original red box version, not the black box reissue. It's an optical compressor and apparently fairly subtle. I couldn't find any info on the vactrol used in the original–sockets are your friend. Should be an easy fit in a 1590B.


17 comments:

  1. Theres any difference with LM741 chip?

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  2. Is that 500 ohm trim to regulate voltage?

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    Replies
    1. No, it allows you to adjust the high pass filter I think.

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  3. Does anyone used germanium transistors ? Thank you!

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  4. How should the photoresistor resistance be ?

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  5. what is LDR and what is the value ??

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    Replies
    1. A LDR is a "Light Dependent Resistor", there is not a specific value, you can use the GL5528 LDR

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  6. How to reduce sound hiss?
    Please reply?

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  7. DON'T use a 741! They hiss really badly

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  8. This comment has been removed by the author.

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  9. Verified..
    But, I want to know that 500ohm trim pot..., what is that for? Is it a attack/release knob?

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  10. Im not a compressor fan,but i made this for a friend,you can verify this,it works,with some tiny noise but bearable,and..i still dont know what a compressor really do πŸ˜…πŸ˜…πŸ˜…

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  11. Is it normal to have a little bit of clipping in this pedal? I tried replacing the LDR with various resistors and found that, the higher the resistor, the more clipping I got. Maybe I need a brighter LED, or a different LDR?

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