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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RF Switch with Varactor Diodes (CB24707E)
Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found...
Unit Gain MOSFET Amplifier (CB6128E)
This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is...
Pulse Counter (CB24087E)
This circuit digitally counts input pulses. The circuit from a November 1970 Radio Electronics uses...