Using the 4046 PLL integrated circuit, this circuit generates signals from 60 Hz to 1.4 kHz via R2. The circuit is from a Radio Electronics from December 1989. C1 can be changed to other frequency ranges.

Using the 4046 PLL integrated circuit, this circuit generates signals from 60 Hz to 1.4 kHz via R2. The circuit is from a Radio Electronics from December 1989. C1 can be changed to other frequency ranges.