Water Leak Protection
Safeguard and Alarm for Water Leaks

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Materials
Component list
Component List
Resistors
(SMD 1206 if not otherwise noted)
R1 = 3M9
R2 = 330 k
R3 = 22 k
R4 = 1 k
R5 = varistor 10D391K
R6 = 47 Ω
Capacitors
C1, C2 = 100 n, SMD 1206
C3 = 100 µ / 16 V, electrolytic, SMD, Ø 5 mm
Semiconductors
D1 = 1N4007, DO213AB
LED1 = LED, red, 3 mm
T1 = BC337, SOT23
IC1 = CD4093, SOP14
Miscellaneous
Re1 = Relay 12 V, 2 × 8 A, e.g. RT42412
PSU = PCB power supply HLK-PM12
J1, J2 = 2-pole pin header
X1 = 4-pole screw terminal, 2/10″
X2 = 2-pole screw terminal, 2/10″
F1 = Fuse 500 mA
Probe = MH-RD Sensor (see Figure 1)
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