Up to 1 Hour timer (CB21424E)

This circuit was found in a 1960s General Electric unijunction transistor manual. The circuit can use any unijunction and the SCR is load sensitive.

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28 V to 5 V converter (CB7331E)
Found in National Semiconductor documentation from the 90's, this circuit has an output current of...
Transistor Characteristic Checker (CB3903E)
With this circuit it is possible to raise the characteristics of a transistor by checking its gain...
Current Transmitter for Resistive Loads (CB14316E)
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...