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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1 kHz filter with DC Coupling (CB12174E)
We found this filter in a Popular Electronics from 1993. The operational amplifier can be the 741....
20 W amplifier (CB18719E)
This simple amplifier with transistors was obtained in a documentation of the 90's requiring a...
Voltage controlled gain amplifier (CB8992E)
Found in a 1980s American documentation, this circuit is intended for amplifying 10.7 MHz video...