Over-Under Voltage Protector Circuit With Delay
Components:
12V step down transformer
Bridge rectifier diode (DF02M)
3 Diodes D1, D2, D3 = 1N4001
Red LED
6.2V zener diode
Capacitor: C1 = 1000µF, 35V
C2 = 100µF, 35V capacitor
12V DC relay
Transistor MPS2907A
3 Op-Amp LM741
Momentary switch
Resistors: R1, R5 = 180ohms
R2 = 200K
R3 = 50K
R4 = 47K
R6 = 1K
R7 = 1M8
R8 = 2K7
R9 = 10K
Variable resistor VR1 & VR2 = 200K
Plug
Socket
The circuit is a modification to the previous 'Over-Under Voltage Block circuit' with an additional feature. Circuit description and operation is the same except for that added feature which delays the time that this protection device comes up (i.e, supply your load) after the interruption. This feature makes this device an ideal one for electrical appliances that use compressor. Such appliances include fridge, freezer, air conditioner etc
Delay is determined by the selected value of capacitor C2 and resistor R7. Average delay time here is about 8 minutes.
Bridge rectifier diode (DF02M)
3 Diodes D1, D2, D3 = 1N4001
Red LED
6.2V zener diode
Capacitor: C1 = 1000µF, 35V
C2 = 100µF, 35V capacitor
12V DC relay
Transistor MPS2907A
3 Op-Amp LM741
Momentary switch
Resistors: R1, R5 = 180ohms
R2 = 200K
R3 = 50K
R4 = 47K
R6 = 1K
R7 = 1M8
R8 = 2K7
R9 = 10K
Variable resistor VR1 & VR2 = 200K
Plug
Socket
The circuit is a modification to the previous 'Over-Under Voltage Block circuit' with an additional feature. Circuit description and operation is the same except for that added feature which delays the time that this protection device comes up (i.e, supply your load) after the interruption. This feature makes this device an ideal one for electrical appliances that use compressor. Such appliances include fridge, freezer, air conditioner etc
Delay is determined by the selected value of capacitor C2 and resistor R7. Average delay time here is about 8 minutes.
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