Minimalist Induction-Balance Metal Detector
A low-cost treasure hunter
Materials
Gerber file
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Extra info / Update
Component list
R1 = 2k?7
R2 = 470?
R3,R5,R6 = 100k?
R4 = 4k?7
R7 = 1k?
R8,R9 = 100?
P1 = 50k? potentiometer, linear
P2 = 2k?5 potentiometer, linear
Capacitors:
C1 = 100µF 25V radial
C2 = 47µF 10V radial
C3 = 10nF
C4, C6 = 10µF 10V radial
C7-C11 = 100nF
Semiconductors:
D1 = 1N4001
IC1,IC2 = 555C, TLC555, 7555 (CMOS)
IC3 = TL071 CP, TL081 CP
IC4 = (LM)317T (in TO220 case )
Miscellaneous:
K1, K2 = 3-way PCB terminal block, lead pitch 5mm
BZ1 = passive (ac) piezo buzzer
PC1,PC2 = solder pins
12V battery or battery block (8 AA penlight cells)
36-30 SWG (0.2-0.3mm dia.) enamelled copper wire, 2 x 50m
Enclosure: Bimbox 5004-14 or Hammond 1590B (109x58x25mm)
5m symmetrical screened microphone cable (two wires with common screening)
PCB, order code 020290-1
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