How to Make a Clap-Clap on/Off Switch
Today we introduce two simple clap switch circuits. The first one is a simple transistor-based circuit and the second one is an advanced mode, it can be also used to control any AC equipment at your home.
The basic working of clap switch
A clap switch is a remote control system, it can control any electrical appliance at your home. Activation of a clap switch is not only with a clap, but also when we produce a good punchy sound.
The simple working principle of a clap switch is when the microphone converts sound energy into electrical voltage, then this converted voltage is amplified and it results in the activation of the relay.
single Transistor used clap switch
This is a simple and basic circuit. You wish to make a clap switch without full knowledge, you can choose this circuit. There are only two components in this circuit. Whenever we clap, the sound will produce and this produced sound is taken into the mic and it will convert into volt, then this voltage will be passed into the base of the transistor. The base voltage of the transistor is above 0.7 volts, so it will become active and follow-through current.
| Components | Value | |
| Transistor | BC547 | 2 |
| Resistor | 10k | 2 |
| Resistor | 1 M | 1 |
| Resistor | 220 ohm | 1 |
| Capacitor | 47uf | 1 |
| led | 1 | |
| Battery | 12v | 1 |
| mic | 1 |
Clap Switch using 555 and 4017
Working of Clap Switch using 555 and 4017
Mainly this project is based on the transistor, op-amp 741, and CD4017 IC. The microphone converts the sound wave into an electrical volt and it is passed into the inverted input of the op-amp and then the signal becomes amplified by an op-amp.
R3 is used to control the sensitivity of the microphone and R1, R2, and VR1 Resistors are used for adjusting the sensitivity of the op-amp.
After the amplification process is completed, it will be passed through pin number 14 of the IC CD4017. When pin 14 becomes high, the output of the CD4017 becomes high, but they are only needed for the required outputs.
This clap switch circuit has 2 outputs, one for the led indication and another one to activate the relay.
We are taking Q1 and Q2 outputs and the 3rd pin is connected to the MR pin of CD4017 to disable other outputs.
| Value | |
| 22k | 1 |
| 10k | 2 |
| 1k | 4 |
| 10k | 1 |
| Cd4017 | 1 |
| 741(opamp) | 1 |
| 1n4007 | 1 |
| Bc547 | 1 |
| 1 | |
| 1 |
