Short Wave Converter (T987E)

The conversion range of this circuit depends on the coil. The circuit uses two tubes, and the power supply is not provided.

Low cost isolation transformer (CB7973E)
Two identical transformers can be used as a single improvised isolation transformer. The maximum...
Community TV Transmitter (CB18132E)
This transmitter can send its signals from several kilometers away, depending only on the antenna...
Power control (CB23586E)
This circuit was found in Radio Electronics magazine from January 1959. The power transistor must...