The circuit consists of an `electronic` attenuator, arranged to respond to a fingertip touching one of its contact plates. Transistor Tl (a type E300 or similar JFET) operates as the variable resistor in a voltage divider (Tl, R 1 ). The channel resistance of Tl depends on the negaUve voltage across C 1.
Downloading of this magazine article is reserved for registered users only.
Discussion (0 comments)