This input circuit for an oscilloscope was found in Radio Electronics from the 90s. The operating circuit is from that time, and a modern equivalent can be tried out.
The circuit shown in the figure makes it possible to control a stepper motor via a PC's serial port...
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...
This transistor tester circuit is a little more sophisticated than the previous two (CB18918E and...