Silent alarm (CB22471E)

This circuit is from a Popular Electronics from 1992. The circuit powers an LED when triggered.

12 V x 10 A Power Supply (CB18219E)
This source for devices for automotive use was found in a 1985 documentation. The power...
Neon lamp driver (CB20918E)
We found this circuit in an old Popular Electronics. It is possible to light a common neon lamp...
Light Control 2 (CB22102E)
This circuit has an opposite action to the previous one, triggering when light falls on the...