30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Infrared Switch (CB18615E)
This circuit uses an infrared remote-control sensor found on televisions. The circuit can control...
1 MHz LED Modulator (CB13535E)
We found this circuit in a 1971 documentation. The circuit can be assembled with more modern...
Morse Automatic Generator (CB4134E)
This circuit is intended to manipulate a transmitter (CW) from coded audio signals recorded on a...