This first-order high pass filter is applicable to any operation requiring a dual power source. It was found in the March 1997 Electronics Now magazine.
This is the circuit of a turntable from the 1970s. We found it in a repair article in the December...
This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at...
This small audio amplifier uses an uncommon integrated circuit today. The circuit is from a...