This circuit allows the detection of RF signals using the lowest range of direct currents of a common multimeter. Equivalent diodes such as 1N34 can be used. The circuit is assembled in a ballpoint tube.
This is one of the possible triac power control configurations using as a trigger element a...
This circuit is from a 1976 Motorola power semiconductor manual. In it we have the optical...
This circuit for generating precise reference signals was found in the April 1973 issue of Radio...