This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
This circuit makes use of a diac to stop the activation of a sensitive reed relay 1 mA. The trip...
The circuit found in a documentation from the 90s allows capacitance measurements to be carried out...
This signal injector and tracer (follower) was found in an old American documentation. The...