Interface shield (CB7260E)

This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The tunnel diode is an uncommon component today.

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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...