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.

Friday, December 12, 2014

Earthquaker Devices Crimson Drive (2-knob version)

Here's a good sounding overdrive from Earthquaker Devices. This is for the first incarnation of the Crimson Drive with just level and gain controls. Uses a J201 in a buffer stage and a PNP AC128 in the gain stage.



Dirk_Hendrik from FSB traced one and drew this schematic.


The power filter section makes me scratch my head a bit, as it uses 2, 100µ caps. To keep things a little simpler on the board I just put one 220µ cap, since the equivalent capacitance of two parallel capacitors is the sum of the individual capacitances.

Also note that the schematic calls for a low current LED, hence the 10k resistor from the power supply. Change that resistor to around 2.2k if you're using a more common LED.


6 comments:

  1. Verified.I built it with ac117 transistor. But there is a little bit hissing and noise, when i turn it on with my usual 9v power supply, anyway, pedal working well with battery. Thanks.

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  2. https://www.youtube.com/watch?v=owzxDfCsZL8

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  3. I'll try with 2SB54 and add Rat's filter.
    Where do you suggest to add it? right after the diodes clipping? or after C6?

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