Multi-User Call Bell For Up To Nine Persons

This unique but simple call bell can be used to call an office boy or a help at home from up to nine different places. Besides ringing, it shows the number of caller’s room or place from where the call is being made. The author’s prototype is shown in Fig. 1 while its block diagram […]

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Credit- EFY. Published by Department of EEE, ADBU: tinyurl.com/eee-adbu