Tone generator

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Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry...

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This circuit produces a wailing or siren sound that gradually increases and decreases in frequency as the 100u charges and discharges when the push-bu...

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This circuit produces a sound similar to a loud clicking clock. The frequency of the tick is adjusted by the 220k pot. The circuit starts by charging ...

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When the push-button is pressed, the 100u will take time to charge and this will provide the rising pitch and volume. When the push-button is released...

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The circuit consists of two multivibrators. The first multi-vibrator operates at a low frequency and this provides the speed of the change from Hee to...

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The circuit consists of two "twin-T" oscillators set to a point below oscillation. Touching a Touch Pad will set the circuit into oscillation. Differe...

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