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Power Overload Monitor

Monitor Power Lines for Excessive Current

Power Overload Monitor
Power Overload Monitor
This circuit measures the power consumption of typical loads such as lamps, household appliances, and heaters. It features an LED bar and an acoustic alarm that warns if an adjustable threshold is exceeded. Loads from 200 W to 6 kW can be monitored.
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Materials

Component list

Component List

Resistors

(SMD 1206 if not otherwise noted)

R1 = 100 Ω

R2 = 4k7

R3 = 18 k

R4 = 1 M

R5 = 47 k

R6, R7 = 22 k

R8 = 1k2

R9 = 180 Ω

R10 = Varistor 10D391K

R11 = 22 k trimpot

R12, R13, R15, = 10 k

R14 = 2k2

R16 = 470 Ω

 

Capacitors

(SMD 1206 if not otherwise noted)

C1, C8 = 100 µ / 16 V, electrolytic, ø 5 mm

C2 = 330 n

C3 = 47 µ / 16 V, electrolytic, ø 5 mm

C4 = 1 n

C5 = 10 µ / 16 V, electrolytic, ø 3.5 mm

C6, C7 = 100 n

 

Semiconductors

D1 = 1N4007, DO213AB

D2…D6 = 1N4148, minimelf

T1 = BC337, SOT23

LED1…LED4 = LED, green, 3 mm 

LED5 = LED, yellow, 3 mm 

LED6 = LED, red, 3 mm

IC1 = LM358, SO8

IC2 = 7805DT, TO252 (DPAK)

IC3 = KA2284, SIP9

 

Miscellaneous

BUZ1 = Buzzer, Diameter 1/2″

L1 = Current transformer Talema AC1020 

X1, X2 = 2 poles screw terminals 

F1 = Fuse 500 mA

PSU = PCB Power Supply HLK-PM12

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