This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital signals. The circuit can be used as a shield. FET can be a modern equivalent.
Using one unijunction transistor and two bipolar transistors, this circuit generates a signal from...
This circuit makes the RIAA equalization for signals obtained from a turntable for signal recovery in other...
In critical applications of the RS-232 interface, the danger of induced voltages in the cables must...