PLL (CB7971E)

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

Voltage Doubler (CB201E)
The simple circuit doubler shown here can source a voltage two times the one applied to the input. The...
Load for Power Supply Test (CB1518E )
This circuit adjusts the drained current to values up to 20 A, allowing the testing of power...
Unijunction Clock 2 (CB6473E)
This circuit uses a capacitor that depends on the frequency of the crystal. We found it in a 1967...