Two Transistors T20 Radio (CB18386E)

This commercial earphone receiver was manufactured in the 1960s in Japan. It was powered by a 9 V battery and the transistors were made of germanium.

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Code Switch (CB12393E)
This code switch was found in a 1990 Electronics Handbook. It can be mounted with BC558...
Sensors or Manual Stepper Motor Control (CB15384E)
In this application we use an additional input circuit to enable the logic command with keys,...
RMS to DC Converter (CB6105E)
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...