PLL (CB7971E)

This common operational PLL circuit was found in a Popular Electronics 90’s. The power supply need not be symmetrical.

PUT neon shutter (CB6686E)
This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the...
6 or 12 V x 3 A Power Supply (CB1189E)
This source whose voltage depends only on the zener diode used, can supply currents up to about 3 A....
Level Indicator (CB1546E )
The operational amplifier can be of any type in this circuit, found in a 1974 publication. The...