Bistable light relay (CB21708E)

This circuit was found in an internet documentation. The relay must have voltage according to the supply.

Adjustable DC Protector (CB18113E)
This circuit from a 2003 documentation, has a protection system that disarms the power supply if...
Versatile Timer (CB21420E)
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
Sweep Generator (CB3955E)
In the figure we have the circuit of a sweep generator obtained in an old publication. The central...