Siren Circuits - Sensors and Detectors

One IC 2 Tones Siren Double Tone Police Sound Single Tone Old Ambulance Sound:

One-IC two-tones Siren: This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police or Fire-brigade cars, by the oscillation of IC1A and IC1B gates.

Powerful Siren: Simple circuitry - No ICs - 12V Battery operation

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