Bistable light relay (CB21708E)

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

Crystal oscillator with compensation (CB9642E)
This temperature compensated circuit was found in a 1980s American documentation. The power supply...
LM3914 Single Powered Voltmeter (CB25456E)
This circuit is an improved version of the previous ones with the LM3914. We found it in the March...
Precedence Indicator 2 (CB12329E)
This indicator was found in a 1974 publication, but it can be fitted with the BC548 transistor or...