This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...
Found with variations on this site, this circuit was taken from an American documentation from the...
This brightness control for incandescent lamps or engine speed has been found in a 1970 English...