This circuit is from an article in Radio Electronics magazine from October 1958. The circuit is for testing electrolytics that operate at high voltages depending on the source.
The figure shows how to implement the AND function with a Norton LM3900 operational amplifier. The number of...
This circuit was found in a PC documentation from 1996. It can be used as a shield with modern...
This voice scrambling scrambler was published in the August 1982 issue of Radio Electronics...