

Parts List
| R1 | 22K ¼ Watt Resistor | |
| R2 | 1Meg ¼ Watt Resistor | |
| R3,R6,R11 | 1K ¼ Watt Resistor | |
| R4 | 100K ¼ Watt Resistor | |
| R5 | 10K Potentiometer (RS271-1721) | |
| R7 | 10K ¼ Watt Resistor | |
| R8 | 10 Ohm ¼ Watt Resistor | |
| R9,R10,R12 | 47K ¼ Watt Resistor | |
| C1,C2,C5 | .1 Microfarad Ceramic Disk Capacitor | |
| C3,C4,C6 | 10 Microfarad Electrolytic Capacitor (observe polarity) | |
| C7 | 100 Microfarad Electrolytic Capacitor (observe polarity) | |
| D1,D2 | 1N4148/1N914 (RS276-1122) Switching Diode | |
| IC1 | 1458 (RS276-038) Dual Op Amp IC. Socket is recommended. | |
| Q1 | 2N3904 (RS276-2016) NPN Transistor | |
| Q2 | MPF102 (RS276-2062) or 2N3819 (RS276-2035) JFET Transistor. (observe different pin out for 2N3819) | |
| S1 | Any SPST Toggle Switch |