![]() ![]() The opamp here is configured as a comparator, meaning it is positioned to differentiate the slightest of voltage differences across its two inputs. The above clap operated relay circuit was provided to me by one of the keen readers of this blog Mr. The circuit may be further understood with the following explanation. The load connected to the relay thus also gets activated and deactivated correspondingly. The flip/flop stage alternately switches the output relay driver in response to every subsequent clapping. 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 is a bistable relay circuit which switches ON/OFF the attached relay alternately in response to each clap sound. These electrical pulses are amplified to suitable levels by the transistors or IC and are fed to the flip/flop. The generated sound is in fact strong ripples or vibrations created due to the sudden compression of air in between our striking palms.Ī mic is connected to the amplifier stage the sound vibrations made by clapping hits the mic and get converted into tiny electrical pulses. The fan regulator can be connected anywhere in series with the wiring.Īny light bulb can be connected with the clap switch relay as given in the folowing figure How Sound Vibrations Trigger the CircuitĪs you must have noticed the clapping of hands creates a loud sound and is sharp enough to move quite a distance. The following image shows how to connect fan with the relay 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. 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. The main application of the clap switch circuits described below is for controlling home appliances like light bulbs and fans. So please stay away from cheap misleading circuits online. Instead they will work like monostables and switch ON the load only for sometime and then switch it OFF. NOTE: An IC 555 circuit can never produce an alternate ON/OFF switching for the load. The device becomes more interesting and useful because it does not require any external mechanism or device to carry out the specified operations. 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. A small electronic circuit when built and integrated to any electrical appliance can be made to switch ON/OFF through mere hand clapping. The article talks about what the title suggests – a clap switch. ![]()
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