Found in an Electronic Design of the 90's, this circuit provides an additional 12 V output to a 5 V regulator. The maximum current is 200 mA.
In the figure we have a circuit suggested by National Semiconductor, using an operational...
Tone controls for audio applications can also be considered filters that must attenuate certain...
This circuit was found in an Argentine publication from 1973. It uses a common AM coil (50 + 50...