This step of good gain was obtained in an American publication of the 1980s. The circuit can be powered by voltages from 3 to 9 V and the FET can be of almost any type.
This circuit is from an English magazine from 1980, but it can be easily assembled with more...
Found in Philips' 1968 documentation, this circuit serves as a 6.3 V reference for high stability. |...
In critical applications of the RS-232 interface, the danger of induced voltages in the cables must...