Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The circuit is CMOS using an integrated 4011.
This circuit for currents from 500 mA to 1.5 A was found on a Ham Radio from the 90s. R4...
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...
Found in a 1980s documentation, this amplifier features high common mode rejection. The operating...