Hello Friends The name of this circuit is Password Switch System. You can use this system in many places you can put a 12v dc solenoid lock in your cupboard and you can install it in any of your devices to turn the system on and off with a password.
We have used these components to make it.
- 12V Relay
- 100k ohm Resistance x 2
- 10k ohm Resistance
- IN4007 Diode x 5
- CD 4017IC
- BC548 Transaction
- Push button x 9
- PCB
You can use a charger or battery to power this circuit.
This is the diagram of password switch system –
We have made it with very less money.
In this, we have put the button of the fault keypad mobile on top of all the switches.