This low-cost, simple, reliable, and effective circuit for a doorbell works without touching. It can be quite useful in our post-Covid-19 world as it minimises the spread of virus through doorbells. Circuit and working The author’s prototype is shown in Fig. 1. Fig. 2 shows the block diagram of the touchless doorbell circuit while Fig. […]
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Credit- EFY. Published by Department of EEE, ADBU: tinyurl.com/eee-adbu
