whats clap switch

Clap switch circuits are projects which are common among hobbyists, but nowadays they had enormous applications in everyday life.


A typical clap switch circuit is a sensor circuit, which senses the sound wave at a particular frequency and reacts with the circuit application.


Clapping sound is the sound need to produce at the circuit to react to an application, setting up such a frequency range sound and another end of the circuit is connected to applications such as a lamp, fan, or appliance.


Clap switch using bc547


Clap switch using bc547
Clap switch using bc547













Two bc547 transistor-based clap switch is a miniature version of clap switch circuit, when we considering the clap switch circuit condenser mic is the most important component need to consider.


A condenser mic is a component used for converting sound waves into electrical pulses, these electrical pulses are weak in terms of their wave strength, and here we need amplification.


Clap Switch Circuit explanation 

There were very few components are used at this clap switch circuit, two bc547 transistors are the multi-vibrator circuit component used at the circuit.


When the clapping sound strikes at the condenser mic, it will convert sound energy into electrical energy, a condenser mic is a capacitance variation component and the R1 resistor value will decide the mic sensitivity.


The electrical signal produced at this point is weak, so we need further amplification is done at Q1 and Q2 transistors.


The clap switch is the reaction circuit, it will react with the sound produced from a clapping sound and covert the sound to electrical energy and amplify the signal, and then the last LED glows.


clap switch circuit diagram using transistor


Transistor-based clap switch circuit having 4 transistors in different sections, when we compare it with the first circuit, this is a little more complicated.


clap switch using transistor
clap switch using transistor

clap switch with transistor Circuit explanation 

This circuit having multiple sections and having more components than the first circuit, we start with the power supply block having transformer and rectifier block, then we have the Q1 transistor, when we produce a clap sound it will sense by the mic and produce equivalent electrical energy and pass towards the transistor Q1 and output produced then given to next section called flip- flop block, C3 and C4 capacitor passes the signal to the base of the two transistors Q2 and Q3.


The actual flip-flop circuit produces signal 1 at the time of mic signal detect the sound, same will be the operation at this section, such a signal is passed towards the Q4 transistor and these results relay into normally closed conditions and the bulb glows.



References Value
C2 1uF
C3-C4 .047uf
R1 15k
R2,R11-R12 2M2
R3 270k
R4 3k3
R5-R6 1k5
R7-R8 10k
R9-R10 27k
R13 2k2
Q1-Q3 BC548BP
Q4 BC368
D2-D4 1N4148
D5 1N4007
DD 220v
RL1 12V


clap switch Applications

The first clap switch circuit is an experiment-type circuit, only we can make it as a miniature model of the clap switch, in a real-time application such as home automation systems and tiny applications we use clapping systems.


But the second circuit is more complicated and it has multiple applications in hobbyist circuits, actually, these circuits had their own drawbacks due to accuracy issues, clapping sound frequency is not an accurate sound wave, so detection of the sound at the mic is not proper.

Higher applications like home automation and vehicular automation, clap switch circuit systems have proper applications, but the sensor system used at this higher-level will need more accurate, microcontroller boards used here is different and costly. 


1.Clap Switch Using Arduino And Sound Sensor

2.clap switch for lights

3.Clap switch using 555

Similar Posts


Leave a Reply

Your email address will not be published. Required fields are marked *