This circuit was found in a 90’s Electronic Design. The circuit uses components that are still common in the market and indicated for use in the car.
This is one of the possible configurations using the LM139, 239 or 339 voltage comparators. The...
Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz...
This circuit is from a Radio Electronics issue of May 1972. It consists of a commercial heating...