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BOM (source mfos)

Qty.	Description	Value	Designators
1	CD40106	CD40106	U1
1	CD4520 Dual Binary Counter	CD4520	U2
2	TL071 Op Amp	TL071	U3, U4
2	Diode 1N914	VALUE	D1, D2
1	Diode Zener	1N5239B	Z1
2	Cermet Multiple Turn Trim Pot	100K	R14, R16
1	Cermet Multiple Turn Trim Pot	10K	R10
1	Linear Potentiometer	1M	R11
2	Resistor 1/4 Watt 1%	1.5K	R15, R17
2	Resistor 1/4 Watt 1%	100K	R7, R9
5	Resistor 1/4 Watt 1%	200K	R3, R4, R6, R8, R13
1	Resistor 1/4 Watt 1%	20K	R5
2	Resistor 1/4 Watt 5%	10K	R1, R20
1	Resistor 1/4 Watt 5%	1K	R2
2	Resistor 1/4 Watt 5%	20K	R12, R19
1	Resistor 1/4 Watt 5%	220K	R18
4	Capacitor Ceramic	.1uF	C3, C4, C6, C7
2	Capacitor Ceramic	.22uF	C5, C9
2	Capacitor Electrolytic	10uF	C2, C8
1	Capacitor Electrolytic	220uF	C1
2	Switch SPST	SPST	S1, S2
1	Switch SPST N.O. Push Button	SPST	S3
1	Jack 1/4" 2 Terminal	Jack 1/4" 2 Terminal	J1