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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Slot Machine (CB24600E)
This circuit was found in the January 1980 issue of Radio Electronics magazine. It is a digital slot...
Who is the fastest Game (CB12394E)
This circuit was found in a 1990 Electronics Handbook. The transistors can also be the BC548 and...
Tunnel Diode Amplifier (CB22542E)
This amplifier circuit is from a 1952 documentation. The frequency of the amplifier signal depends on...