Three-channel guitar preamp (stompbox)

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Main board.

Schematics (pdf)

pdf

Ready to transfer PCB (pdf)

pdf

Upper side assembly (pdf)

pdf

Since the pedal powered one voltage ~ 14V, rectifier bridge B1 is not installed and instead it soldered two jumpers. Rectified voltage fed from the power supply

Bottom side assembly (pdf)

pdf

PSU.

Schematics (pdf)

pdf

Ready to transfer PCB (pdf)

pdf

Covponents positions (pdf)

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Control board

Schematics (pdf)

pdf

Ready to transfer PCB (pdf)

pdf

Upper side assembly (pdf)

pdf

Bottom side assembly (pdf)

pdf

Program

Clean channel controls (pdf)

pdf

Red/Blue channels controls (pdf)

pdf

For power amplifier overdrive simulatiom used

Micro power amplifier for line recordimg

Inside view.

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Samples kindly recorded Denis Soloviev (Denn).

Clean

Clean trough micro PA

Clean trough micro PA with speaker saturation simulatiom

Crunch

Crunch trough micro PA with speaker saturation simulatiom

Lead

Mix, all three channels