Door Knocker Bell

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< PIC Assembler, PIC Basic, PIC-C ~ Door Knocker Bell

eric

Posted: Mon Aug 28, 2006 12:15 pm Post subject: Door Knocker Bell

Site Admin Joined: 01 Jan 1970 Posts: 311

If you have an old house, it’s nice to have only a door knocker
and no doorbell, since ‘back then’ no-one had a doorbell and
it destroys the illusion of authenticity. Although a door knocker
makes quite a racket, if you happen to be in the garden, the
attic or the cellar it might not be enough. The circuit shown
here solves this problem by acting as a sort of ‘electronic
extension’ for the door knocker.
A standard piezoelectric buzzer (not an active type) is used
here as a vibration pickup (or ‘knocking pickup’, if you will). If
you tap on such a buzzer it can easily produce

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