Whistle Responder

Posted on Mar 27, 2013

Beeps when hears your whistle A gadget suitable for key-holders, games etc. These devices contained a special purpose IC and therefore were not suited to home construction. The present circuit is designed around a general purpose hex-inverter CMos IC and, using miniature components and button clock-type batteries can be enclosed in a matchbox. It is primarily a gadget, but everyone will be able to find suitable applications.

Whistle Responder
Click here to download the full size of the above Circuit.

This device beeps intermittently for about two seconds when a person in a range of around 10 meters emits a whistle. The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies consistently the signal picked-up by the small elec

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Ibi   Feb 21, 2008

Can't make it work......mmm I've changed the Cmos, changed the bc337, buzzer(i have a 3.3KHz) Does anyone knows if it works?

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