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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Sun tracker for solar panels (CB21014E)
Found in Popular Electronics from the 90s, this circuit aims to drive a solar panel, constantly changing...
Light alarm (CB22056E)
This circuit triggers an LM380 oscillator, producing an audio tone with light falling on the LDR....
Debouncer (CB9277E)
This circuit was found in a 1967 American documentation. The switching diode (tunnel) used is an...