Phone Patch (CB9398E)

This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio amateur equipment

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60 V Regulator (CB15131E)
This voltage regulator was obtained in the SGS manual of linear integrated circuits of 1982. The...
Automatic Hand Dryer (CB17658E)
Of course, the design indicates a specific application for a touch switch. Thus, analyzing the...
Or exclusive with transistor (CB7249E)
In the figure we have the way to obtain the Exclusive-OR function with 1 transistor. The circuit...