The circuit here is a soft-touch switch. Soft-touch means that when the switch is once pressed the circuit is turned on. Similarly, when it is pressed again it is turned off. IC NE555 and a relay make up the switch ON/OFF circuit.
Hardware Components
The following components are required to make the ON/OFF Switch Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | IC | NE555 Timer | 1 |
| 2. | Battery | 12V | 1 |
| 3. | Relays | 12V | 1 |
| 4. | Diode | 1N4007 | 1 |
| 5. | Resistor | 5.1MΩ | 2 |
| 6. | Switches | – | 2 |
NE555 IC Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
ON/OFF Switch Circuit
Working Explanation
This switch circuit uses a 12V DC battery. Circuit operation is very simple involving two soft push buttons. The IC NE555 remains in one state either ON or OFF when the switch is pressed, accordingly. Moreover, the relay remains connected with the IC and receives a signal from NE555. Similarly, Relay deactivates only with the switch pressed OFF. The relay connects this circuit with the appliances and other electronic circuits to perform the desired function.
