This circuit was found in a 90s EDN. It activates a protection relay in case of reversing the polarity of the supply of a load.
Found in American documentation from the 90s, this circuit uses common FETs. It has a range drift...
This circuit is both simulation of the operation of a diode bridge and a test circuit for this...
Found in American documentation, this circuit for modulated infrared signals can be tuned to a...