Posted on Jun 24, 2012

The unit provides a square-wave output that is rich in harmonic content. The circuit`s output frequency can be varied from 50 Hz to 15 kHz. The heart of the circuit is a 555 astable connected in its equal mark/space mode. The frequency is controlled by potentiometer R2 and capacitor Cl.

Click here to download the full size of the above Circuit.

Resistor R3 controls the output level with the output ac-coupled through C3.

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