Noise-Driven Sound Generator Schematic Diagram

Noise-Driven Sound Generator Schematic Circuit Diagram

The sound generator shown here uses its built-in loudspeaker as a microphone when it is in the standby state. As soon as it detects a noise that exceeds an adjustable threshold level, it becomes active. This small, clever circuit can be used as an alarm generator that reacts to noises. You can also use it[…]

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Electronic bell-push

A solid-state bell-push is far more robust than the usual mechanical type. The touch contact may be made from an audio socket, which has a high insulation resistance and is practically indestructible. The inverting (-) input of IC1 is at half the supply voltage via R4-R5, while the non-inverting input is at earth potential via[…]

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