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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