Freezing sensor (CB21288E)

This circuit was found in a Popular Electronics from the 90's. The components are common. The potentiometer adjusts the circuit's trigger point.

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Christmas Tree (CB26117E)
This flashing allegory with 555 integrated circuits was found in the Radio Electronics...
Tactical Switches KXT Series
June 2017 - The new touch switches C & K KXT series can now be obtained from Mouser Electronics. These...
Comparator with hysteresis (CB9586E)
This non-inverting comparator was found in old American documentation. Formulas next to the...