4 Simple Clap Switch Circuits [Tested]
The clap switch circuits explained here will toggle a connected load ON and OFF in response to alternate clap sounds? Here we discuss 4 unique and simple designs which can be selected as per user preference.
The article talks about what the title suggests – a clap switch. A small electronic circuit when built and integrated to any electrical appliance can be made to switch ON/OFF through mere hand clapping.
The proposed design when integrated to any of your electrical appliance can be used to switch it ON and OFF simply through alternate clapping of your hand. The device becomes more interesting and useful because it does not require any external mechanism or device to carry out the specified operations.
NOTE: An IC 555 circuit can never produce an alternate ON/OFF switching for the load. Instead they will work like monostables and switch ON the load only for sometime and then switch it OFF. So please stay away from cheap misleading circuits online.
Main Application Areas
The main application of the clap switch circuits described below is for controlling home appliances like light bulbs and fans.
Suppose you want to connect a ceiling fan with this circuit so that you can switch it ON or OFF with alternate clap sound, you can easily do it, by wiring the fan 220 V AC input through the relay of the circuit.
Similarly, if you wish to switch a tube light or any 220 V or 120 V AC lamp, just wire it in series with the relay of the clap switch.
The following image shows how to connect fan with the relay
How Sound Vibrations Trigger the Circuit
As you must have noticed the clapping of hands creates a loud sound and is sharp enough to move quite a distance. The generated sound is in fact strong ripples or vibrations created due to the sudden compression of air in between our striking palms.
The flip flop is a bistable relay circuit which switches ON/OFF the attached relay alternately in response to each clap sound.
The circuit presented here is basically made up of two stages, the first stage is a two transistor hi-gain amplifier and the second stage consists of an efficient flip/flop.
The flip/flop stage alternately switches the output relay driver in response to every subsequent clapping. The load connected to the relay thus also gets activated and deactivated correspondingly.
The circuit may be further understood with the following explanation.
1) Clap Switch Circuit Using IC 741.
The above clap operated relay circuit was provided to me by one of the keen readers of this blog Mr. Dathan.
The circuit is very easy to understand:
The opamp here is configured as a comparator, meaning it is positioned to differentiate the slightest of voltage differences across its two inputs.
When the clap sound hits the mic, a momentary drop of voltage is experienced at pin#2 of the IC, this situation raises the voltage at pin#3 of the IC for that instant.
As we know, with pin#3 at higher potential than pin#2 makes the output of the IC high, the condition puts the output of the IC go high momentarily.
4 Simple Clap Switch Circuits [Tested]
The clap switch circuits explained here will toggle a connected load ON and OFF in response to alternate clap sounds? Here we discuss 4 unique and simple designs which can be selected as per user preference.
The article talks about what the title suggests – a clap switch. A small electronic circuit when built and integrated to any electrical appliance can be made to switch ON/OFF through mere hand clapping.
The proposed design when integrated to any of your electrical appliance can be used to switch it ON and OFF simply through alternate clapping of your hand. The device becomes more interesting and useful because it does not require any external mechanism or device to carry out the specified operations.
NOTE: An IC 555 circuit can never produce an alternate ON/OFF switching for the load. Instead they will work like monostables and switch ON the load only for sometime and then switch it OFF. So please stay away from cheap misleading circuits online.
Main Application Areas
The main application of the clap switch circuits described below is for controlling home appliances like light bulbs and fans.
Suppose you want to connect a ceiling fan with this circuit so that you can switch it ON or OFF with alternate clap sound, you can easily do it, by wiring the fan 220 V AC input through the relay of the circuit.
Similarly, if you wish to switch a tube light or any 220 V or 120 V AC lamp, just wire it in series with the relay of the clap switch.
The following image shows how to connect fan with the relay
How Sound Vibrations Trigger the Circuit
As you must have noticed the clapping of hands creates a loud sound and is sharp enough to move quite a distance. The generated sound is in fact strong ripples or vibrations created due to the sudden compression of air in between our striking palms.
The flip flop is a bistable relay circuit which switches ON/OFF the attached relay alternately in response to each clap sound.
The circuit presented here is basically made up of two stages, the first stage is a two transistor hi-gain amplifier and the second stage consists of an efficient flip/flop.
The flip/flop stage alternately switches the output relay driver in response to every subsequent clapping. The load connected to the relay thus also gets activated and deactivated correspondingly.
The circuit may be further understood with the following explanation.
1) Clap Switch Circuit Using IC 741.
The above clap operated relay circuit was provided to me by one of the keen readers of this blog Mr. Dathan.
The circuit is very easy to understand:
The opamp here is configured as a comparator, meaning it is positioned to differentiate the slightest of voltage differences across its two inputs.
When the clap sound hits the mic, a momentary drop of voltage is experienced at pin#2 of the IC, this situation raises the voltage at pin#3 of the IC for that instant.
As we know, with pin#3 at higher potential than pin#2 makes the output of the IC high, the condition puts the output of the IC go high momentarily.
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