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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Audio Preamplifier (CB16297E)
We have here an interesting audio preamplifier, which can be useful to those who are looking to...
Regenerative receiver (CB20513E)
We found this receiver in old documentation. The transistor is made of germanium and the...
Automatic Crossing Light (CB14947E)
When a model train crosses a level crossing, interrupting the light on the sensor, this circuit...