The circuit shown, with the printed circuit board, was found in an article in the June 1990 issue of Radio Electronics magazine. Integrated circuits must be equipped with heat sinks.
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...
We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...
In the original 2000, this circuit was designed to interface the parallel port with external...