PLL (CB7971E)

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

Neon Audio Oscillator (CB11535E)
This circuit was originally designed for the practice of Morse code, something common in 1966, the year...
144 MHz Frequency Doubler (CB4675E)
This circuit is from an old American amateur radio manual. The circuit shows how to use a Varicap...
500 MHz x ½ W Oscillator (CB5031E)
This circuit was found in a 1987 Radioaficion Microcomputacion magazine. This Spanish magazine no longer...