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Opamp as a Timer Tutorial

Opamp as a Timer Diagram

At switch on, the voltage across the capacitor is zero and the output is at +12 volts. The buzzer is not energized. After a time, determined by the values of C and R3, the voltage of the inverting input rises above that of the non inverting input.

The output goes to minus 12 volts and the buzzer is energized.

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