Microcontroller controlled dimmer (CB25087E)

This circuit was found in a Radio Electronics magazine from October 1987. It can be used as a shield for incandescent and heating elements.

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Solar power supply for tunnel diode (CB23827E)
In the figure we have a way of using a solar cell as a source for circuits with tunnel diodes. The solar...
Graphic Equalizer (CB24554E)
This equalizer was found in the May 1978 issue of Radio Electronics magazine. The component values...
Headphone Amplifier (CB21550E)
This circuit for high-impedance magnetic headphones was suggested as an experimental amplifier for hearing...