Part list Circuitry Chips LM324A -- Quad op-amp LM741 -- Single op-amp 4024 -- 7-bit ripple counter 74LS04 -- Hex inverter 74LS40 -- Dual 4-input NAND ICM7240IPE -- Programmable Timer/Counter 74HC373 -- Latch 74LS08 -- Quad 2-input AND Resistors (ohms) 1k 10k 100k 1M Capacitors 8.2 nF 0.1 uF 10 uF 0.47 uF Other Junction diode Fixture ABS plastic Wood Spring Clamp Pittman GM9000 with 63:1 gearing Flex coupling Other Handy Board Bass guitar Spin Doctor Bass Peg Adapter

Part sources McMaster-Carr Maxim Digi-Key Radio-Shack Guitar Center