Posted on Jun 18, 2012

This circuit uses one of the LM389 gate the power amplifier on and off by applying the muting technique. The other transistors form a cross-coupled multivibrator circuit that controls the rate of the square-wave oscillator.

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

The power amplifier is used as the square-wave oscillator with individual frequency adjust provided by potentiometer R2B.

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