RF indicator (CB8217E)

This circuit was found in a 90s Popular Electronics. The circuit indicates if a transmitter is working, monitoring its signal.

Rocket Launcher (CB4447E)
This circuit, from a 1988 publication, consists of a timer that activates a relay at the end of a...
Opto control for triac (CB20552E)
Found a documentation for PC from 1992, this circuit is indicated for the English power grid of...
Window Comparator 741 (CB5076E)
This conventional window comparator configuration was found in an old documentation. It is valid...