This grounding test circuit was found in an American 80's documentation. The circuit is for the 110 V power grid but can be changed to the 220 V power grid.
In this circuit found in a 1991 publication we can use the 2N2646 unijunction transistor and the...
The circuit shown in the figure can act as a home repeater for AM signals from the output of an...
This circuit consists of a traditional amplifier version with complementary output using BD series...