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How to Make a Dual Tone Siren Circuit

This two tone siren circuit explained here gives out a continuously varying high amplitude sound. Since the supply voltage is not critical, it can be used in cars, motor cycles or at home. It can replace the ordinary call bell. Circuit Operation The circuit consists of two separate free running multivibrator and an oscillator.A free running or … Read moreHow to Make a Dual Tone Siren Circuit

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