Found in an old English publication, this circuit applies to the 240 V network, but can be changed to lower voltages. Transistors are mostly general-purpose, admitting modern equivalents.
This circuit with 5 V power was suggested by Motorola's Linear Databook of 1990. The circuit has...
With an optodiac we have the circuit of the figure, suggested by MotoroIa, in which we do the...
Created to serve as a booster for TV signals in the UHF band, this circuit was found in the March...