Twilight Simulator (CB26055E)

This circuit simulates dusk by slowly dimming an incandescent bulb. It was found in the August 1998 issue of Electronics Now magazine.

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Frequency Doubler (CB4868E)
This low frequency doubler requires a 50 mV signal at the input. The circuit is from an old...
1 kHz Transistor Oscillator 1 (CB12906E)
This oscillator generates a 1 kHz signal, using an old germanium PNP transistor. The circuit was...
Instrumentation amplifier (CB7029E)
Found in an Elektor from the 90s, this circuit is suitable for viewing audio signals on an...