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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9 V and 1.5 V battery test (CB24457E)
We found this circuit in documentation from the 90s. Instead of a voltmeter, you can use the...
Bandpass filter (CB24286E)
Suitable for audio signals in electronic music, this circuit was published in the September 1973...
Current regulator (CB9158E)
This circuit was found in Radio Electronics from the 90s. The transistor is for general use. The...