The timer is controlled by sound. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The timer is controlled by sound. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches

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The device, whose diagram is printed in Popular Electronics magazine (USA), generates a positive pulse when a sound (for example, the firing of a starting pistol) reaches microphone B1 (see diagram).

Sound controls the timer

The variable resistor R3 regulates the sensitivity of the device, and the LED V4 signals its inclusion. Opening contact S1, connected to the finish line, breaks the power circuit of the trinistor V5 as soon as the athlete crosses the finish line.

The device can use any silicon transistors n-p-n and p-n-p conductivity, for example, the KT315 and KT301 series, the KU101 or KU502 trinistor with any letter index, the AL307A, B LED.

As a microphone, we recommend using the "speaker" DEM-4m.

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