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Components:
12V step down transformer
Bridge rectifier diode (DF02M)
Diodes D1, D2, D3, D4= 1N4001
Red LED
6.2V zener diode
Capacitor: C1 = 1000µF, 35V
C2 = 0.01µF ceramic
12V DC relay
Transistor MPS2907A
3 Op-Amp LM741 |
Momentary switch
Resistors: R1, R5 = 180ohms
R2 = 200K
R3 = 50K
R4 = 47K
R6 = 1K
R7 = 220K
Variable resistor VR1 & VR2 = 200K
Plug
Socket |
The circuit is a modification to 'Over-Under Voltage Block' with an additional feature. Circuit description and operation is the same except for that added feature which makes it possible for you to turn on this protection device at will after interruption caused by abnormal (high or low) voltage supply. Just press the reset switch SW and the device will supply your load.
Related pages
Over-Under Voltage Block Circuit
Over-Under Voltage Block Circuit With Delay
Over-Under Voltage Block Circuit With Reset |
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