Neon Power Monitor (CB24103E)

This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics magazine. The circuit is for power supplies.

RF Filter for Phono Pickup LM381 (CB25280E)
The purpose of this circuit is to eliminate RF picked up by a turntable. The circuit is from a...
60 Hz Generator (CB9103E)
This circuit synchronized by the power grid can be used as a shield. We found it in an 80's...
Tic Tac Toe (CB17344E)
This is a very simple version in which we simply fit the jacks, plugs with red and green LEDs,...