Found in the March 1989 issue of Radio Electronics magazine, this circuit is used to test printer and other cables. The indication is made by LEDs.
The circuits below were found in amarican publication of the year 1958. The transistors are...
This circuit produces signals that depend on the input control voltage. It is a Voltage Controlled...
The bipolar transistors may be BD136 and BD136 and FET of any type for 1 A current at least. The...