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How to build Whistle Responder

2018-11-12 02:14  
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Beeps when hears your whistle

A gadget suitable for key-holders, games etc.

Circuit diagram:

Whistle Responder-Circuit diagram


R1 22K 1/4W ResistorR2 10K 1/4W ResistorR3 4M7 1/4W ResistorR4,R8 100K 1/4W ResistorsR5 220R 1/4W ResistorR6 330K 1/4W ResistorR7 47K 1/4W ResistorR9 2M2 1/4W ResistorR10 1M5 1/4W ResistorC1,C5 47nF 63V Polyester or Ceramic CapacitorsC2,C3 10nF 63V Polyester CapacitorsC4,C6 1μF 63V Electrolytic CapacitorsD1,D2 1N4148 75V 150mA DiodesIC1 4049 Hex Inverter ICQ1 BC337 45V 800mA NPN TransistorMIC1 Miniature electret microphoneBZ1 Piezo sounder (incorporating 3KHz oscillator)B1 2.8 or 3V Battery (see notes)

Device purpose:

Some 15 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. 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.

Circuit operation:

This device beeps intermittently for approx. two seconds when a person in a range of about 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 electret-microphone and IC1B acts as a band-pass filter, its frequency being centered at about 1.8KHz. The filter is required in order to select a specific frequency, the whistle's one, stopping other frequencies that would cause undesired beeper's operation. IC1C is wired as a Schmitt trigger, squaring the incoming audio signal. IC1D is a 2 second (approx.) monostable driving the astable formed by IC1E & IC1F. This oscillator generates a 3 to 5Hz square wave feeding Q1 and BZ1, thus providing intermittent beeper's operation.


Power supply range: 2.6 to 3.6 Volts.Standing current: 150μA.Depending on dimensions of your box, you can choose from a wide variety of battery types:2 x 1.5 V batteries type: AA, AAA, AAAA, button clock-type, photo-camera type & others.2 x 1.4 V mercury batteries, button clock-type.1 x 3 V or 1 x 3.6 V Lithium cells.

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