Various Switching circuit including clap switch, touch witch heat switch are already posted. Now, here is two in one switching circuit i.e. clap switch as well as touch switch with facility of timer.
Circuit Description Clap Switch Cum Touch Switch
The circuit of clap switch cum touch switch 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 loudspeaker as sound sensor. Audio transformer of 3 volts is connected to the loudspeaker as coupling transformer. The central terminal of transformer is kept open as shown in circuit diagram of 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 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 ON state for certain interval of time due to the timer circuit.
PARTS LIST OF CLAP SWITCH SUM TOUCH SWITCH
|Resistor (all ¼-watt, ± 5% Carbon)|
|R1 = 150 Ω|
R2 = 100 Ω
R3 = 1 Ω
VR1 = 1M Ω
|C1, C5 = 100 µF/10V|
C2 = 6.8 KpF
C3 = 1.5 KpF
C4 = 1000 µF/10V
C6 = 0.1 µF
|IC1 = TBA810|
IC2 = NE555
D1 – D3 = 1N4001
|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)