PROTECTION SYSTEAM FOR ELECTRICAL AND ELECTRONICS APPLIANCES.

PROTECTION SYSTEAM 

ELECTRICAL AND ELECTRONICS APPLIANCES PROTECTION SYSTEAM IF THE POWER GOES OUT AND YOU FORGET TO TURN OFF THE SWITCH.

This system works like this, normally when you turn it on it is off, It is turned on with two types of switches, 
  • Soft switch and 
  • Normal switch, 
PROTECTION SYSTEAM FOR ELECTRICAL AND ELECTRONICS APPLIANCES.


NORMAL SWITCH

by using the normal switch you turn it on and remember to turn it off, if the power goes out and power come back to the period you did not turn it off on that normal switch, power will directly go to your equipment. 

SOFT SWITCH

A soft switch is a switch that when you turn on the electricity, it will go to your equipment and if you turn it off directly, your equipment will have no electricity. 
The advantage of this switch is that if the power goes out and  the power goes out and power come back to the period you did not turn it off, this system will not allow power to go directly to your devices until you use the ON/OFF/RESET switch to allow power.

COMPONETS USED

Transformer - 12vac
Bridge rectifier
Voltage regulator - LM7812
Capacitor -C10 = 1000uF/25V, C11 = 0u33F/63V, C1 = 1.6uF/16V
Transistor Q1,Q7 - BC547
IC 1 - NE555
IC 2 - 74LS76
Relay 12V
LED
Push button 
Switch

RESISTOR

R1  - 670K
R2 - 330R
R3 - 220R
R4 - 470K
R5 - 330R
R6 - 100R

DIODE

D1 - 1N4007





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