1590B · 4 knobs

Transponder

Based on the EQD Disaster Transport Jr· 1 other board clones it

Schematic

The schematic is in the vendor's build document, page 13. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Ref	Value	Normalized	Type
Resistors 23
R1	1M	1M
R2	470k	470k
R3	470k	470k
R4	220k	220k
R5	47k	47k
R6	47k	47k
R7	100k	100k
R8	22k	22k
R9	10k	10k
R10	10k	10k
R11	47k	47k
R12	10k	10k
R13	10k	10k
R14	10k	10k
R15	22k	22k
R16	22k	22k
R17	20k	20k
R18	220k	220k
R19	10k	10k
R20	1k5	1.5k
R21	1M5	1.5M
R22	10k	10k
R23	10k	10k
Capacitors 27
C1	220n	220n
C2	100pF	100p
C3	1uF	1u
C4	1uF	1u
C5	22n	22n
C6	22n	22n
C7	1n	1n
C8	2n2	2.2n
C9	100n	100n
C10	100n	100n
C11	22n	22n
C12	22n	22n
C13	1uF	1u
C14	100n	100n
C15	22n	22n
C16	22n	22n
C17	1uF	1u
C18	1uF	1u
C19	100uF	100u
C20	100n	100n
C21	10uF	10u
C22	100n	100n
C23	100n	100n
C24	470n	470n
C25	100uF	100u
C26	100n	100n
C27	10uF	10u
Diodes 3
D1	1n914	1N914
D2	1n914	1N914
D3	1n5817	1N5817
ICs 2
IC1	TL072	TL072
IC2	PT2399	PT2399
Potentiometers 4
MIX	5KB	B5k	Potentiometer
RPT	5KB	B5k	Potentiometer
TONE	25KB	B25k	Potentiometer
TIME	50KB	B50k	Potentiometer