60 Hz Suppressor (CB6738E)

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

Bridge type transistor tester (CB20526E)
We found this circuit in documentation from the 1950s. The circuit basically applies to germanium...
1 A symmetrical power supply (CB25954E)
The circuit shown, with the printed circuit board, was found in an article in the June 1990 issue...
Divider by 5 4 or 3 (CB6899E)
We found this circuit in documentation from Ferranti from 1968. The circuit uses transistors from that...