This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at the time. The circuit is from a 1970 CQ magazine.
This circuit can be used as a shield for microcontrollers. The circuit is from American...
This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset...
This watt meter was found in an old telecommunications documentation. The circuit is interspersed...