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.
We found this receiver in old documentation. The transistor is made of germanium and the...
This conventional 4 channel circuit with the 4017 and 555 was found in the November 1991 Radio...
In the figure we have the basic configuration for interfacing TTL logic with CMOS logic. The...