CW Monitor (CB21439E)

This circuit for monitoring telegraphy transmissions was found in a 1975 CQ magazine. Transistors may be modern equivalents.

| Clique na imagem para ampliar |

Adjustable Power Supply LM317 (CB18644E)
This conventional circuit with a source adjustable to 1.5 A was obtained in a documentation...
Continuity Test (CB23712E)
This circuit, which consists of an audio oscillator, was found in a Radio Electronics magazine from...
Colpitts Oscillator (CB25008E)
Found in the November 1986 issue of Radio Electronics magazine, this circuit can generate signals of...