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