Complete Alarm with NO and NC Sensors (CB24141E)

We found this circuit in the July 1971 Radio Electronics magazine. The circuit activates a Sonalert or a relay for a higher power warning system.

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Locked Alarm Using SCR (CB19222E)
We found this circuit in an American publication from the 90s. The power must be 2 V more than the...
High-gain amplifier (CB9019E)
Found in old American documentation, this circuit makes use of operational amplifiers from the 70s...
5-LED Driver U2X7B (CB25439E)
This linear LED scale circuit was found in the February 1992 issue of Radio Electronics magazine. Note...