Monday, December 5, 2022

A Special Switch For The Specially Abled

By S.C. Dwivedi

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Specially Abled persons, without hands or feet, often find it difficult to switch on an appliance. This switch can come to their rescue. It can be operated with a torch light or a laser light by those who are unable to use their feet, and with a footswitch by those who are unable to use their hands, to operate home appliances, fixtures, toys, learning devices, and other gadgets. The author’s circuit wired on a breadboard is shown in Fig. 1.

 Author’s circuit wired on a breadboard
Fig. 1 Author’s circuit wired on a breadboard

Circuit diagram of the switch for the specially abled is shown in Fig. 2. The circuit comprises a bridge rectifier (BR1), 12V voltage regulator 7812 (IC1), dual flip-flop 4027 IC (IC2), 12V one-changeover relay (RL1), a foot switch (S1), and a few other components. Capacitors connected across the supply terminals are used to minimse any noise signals.

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This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s October 2022 Issue–print or ezine edition.


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