Various Switching circuits including clap switch, touch witch heat switch is already posted. Now, here is two in one switching circuit i.e. clap switch cum touch switch with a facility of timer.
Circuit Description Clap Switch Cum Touch Switch
This circuit uses a timer IC NE555 (IC2) and audio amplifier IC TBA810 (IC1). TBA810 is a 7-watt audio amplifier IC which is used to amplify the audio signal coupled from audio transformer X1. Here we used a loudspeaker as a sound sensor. The audio transformer of 3 volts is connected to the loudspeaker as a coupling transformer. The central terminal of the transformer is kept open as shown in the circuit diagram of the clap switch cum touch switch.
The loudspeaker LS1 is used to change audio signal to voltage signal which is further coupled with audio transformer and is given to the input of audio amplifier IC (IC1). The amplified output from pin 12 of IC1 is connected to pin 2 of IC2.
When the power supply of 9-volt is applied with switch SW1 closed, the relay RL1 operates. It remains in an ON state for a certain interval of time due to the timer circuit.
The purpose of switch SW1 is to select between the touch switch and the clap switch. With the Close position of switch SW1, this circuit works as a Clap switch. With the Open position of switch SW1, this circuit works as a touch switch.
Check out other touch-operated switches posted in bestengineeringprojects.com
- Touch Switch Circuit using Transistor
- Touch Switch-Cum-Heat Operated Switch
- Simple Touch Switch Using Two Transistor
- Thermal Touch Switch using op-amp 741
- Touch Dimmer Circuit
Electronics Component Required
| Resistor (all ¼-watt, ± 5% Carbon) |
| R1 = 150 Ω
R2 = 100 Ω R3 = 1 Ω VR1 = 1M Ω |
| Capacitors |
| C1, C5 = 100 µF, 10V (Electrolytic capacitor)
C2 = 6.8 KpF (Ceramic Disc) C3 = 1.5 KpF (Ceramic Disc) C4 = 1000 µF, 10V (Electrolytic capacitor) C6 = 0.1 µF (Ceramic Disc) |
| Semiconductors |
| IC1 = TBA810 (Audio Amplifier IC)
IC2 = NE555 (Timer IC) D1 – D3 = 1N4001 (Rectifier Diode) |
| Miscellaneous |
| RL1 = 6V, 100Ω Relay
SW1 = Selector Switch L1 = Light bulb or Load LS1 = 8Ω Speaker (Used as microphone) X1 = Audio Output Transformer (3 or 4.5 V) Touch Plate |