The project shown here is of simple touch switch circuit using two transistor which is used to control various types of electrical appliances like electrical bulb, fan, door bell etc. The complete circuit is build around two general purpose transistors, a relay and a touch plate. The length of wire connected between touch plate and base of transistor T1 must be short as possible, where size of touch plate must not exceed the size of 1 rupee coin. Transistor T1 is used as signal amplifier where T2 is a relay driver transistor.
Check out other touch operated switch posted in bestengineeringprojects.com
- Touch Switch Circuit using Transistor
- Touch Switch-Cum-Heat Operated Switch
- Clap Switch Cum Touch Switch
- Thermal Touch Switch using op-amp 741
- Touch Dimmer Circuit
PARTS LIST OF SIMPLE TOUCH SWITCH CIRCUIT USING TWO TRANSISTOR
| Semiconductors |
| T1 = BC148 (General Purpose Silicon NPN transistor)
T2 = AC128 (General Purpose Silicon PNP transistor) D1 = 1N4001 (Rectifier Diode) |
| Miscellaneous |
| RL1 = 6V relay
Touch plate |