Using a 4046 PLL, which is uncommon today, this circuit was found in the October 1994 issue of Electronics Now magazine. The circuit can be modified by changing the capacitor.
We found this circuit with transistors in a Philips documentation from 1968. The double transistor...
This circuit is from a 1965 General Electric manual. It uses components from the time that admit...
Obtained from a 1996 documentation, this circuit uses common components and has a voltage gain of 200...