PCB FOR DIY GUITAR EFFECTS

Gemini - to house E and CrunchBox.

Size of Board: 46mm Width x 22 mm Height (1590B OK!)

Knob arrangement: 5K - Distortion  ; 50k - Volume

Original transistor BC208A (hfe 125~260 @ 2mA) is distincted!
BC108A is a good replacement.

Any low gain NPN transistor , with CBE (BC series, BC107 / 108 / 109…) or EBC (2n series, 2n3904, 2n4401….) layout can be used. If BC series is used, remember to turn the transistor 180 degree when install.

104 film cap is TROPICAL FISH CAP in original circuit.

1M resistor, 2k2 resistor, LED and 100uF eCap is not present in original schematic. It was added to elimiated pop with 3PDT True Bypass switching.

Size of Board: 55mm Width x 27 Height (1590B Box Ok!)

Pot Arrangement: GAIN–FREQ–VOL

INPUT is the pad below 2M2 Resistance.
The component near “Purple800″ label is LED and a pads to connect to 3PDT switch. 2k2 near Dp is the current limiting resistor for this LED.

The pitch of cap are for ceramic multi-dip.

This is a plexi/crancked JCM800 emulation.