Straight Edge Distortion Unit Kit is perfect for that crunchy clippy guitar distortion effect. This battery operated unit features both volume and distortion control, and comes with a chunky latching power switch. The distortion unit can be used with various other inputs, like dynamic microphones and piezoelectic pickups – but it works really well with an electric bass guitar. To build it, download aPDF of the instructions or schematic. For a PDF of the PCB artwork click here – Note: It’s a mirror image used to make a laser toner transfer, you may have to reflect it depending on your method for printing PCBs.