Posted on Aug 16, 2012

A phase shift oscillator using the LM324 operates at an adjustable rate, 5-10 Hz, set by the speed pot. A portion of the oscillator output is taken from the depth pot and used to modulate the on resistance of two 1N914 diodes operating as voltage controlled attenuators.

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Care must be taken to restrict the incoming signal level to less than 0.6 V pk-pk, or undesirable clipping will occur.

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