60 Hz Suppressor (CB6738E)

This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American documentation from the 60s.

Annunciator (CB6792E)
Found in a 90's EDN this circuit can be used as a shield. The transistor is a general-purpose type and the...
555 2-Range Relay Up to 10 Minutes (CB25535E)
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
Super regenerative VHF receiver (CB7516E)
This circuit was found in an American documentation from 1977. The circuit can be implemented with modern...