This circuit was found in a National Semiconductor manual from the 1980s. The operational amplifier is from that time and the waveforms are shown in the diagram.
This circuit is from an English publication from 1978, but it can be assembled with BC548 for TR2...
This simple voltage regulator with FET was found in American documentation from the 1980s....
This circuit was used to regulate the speed of small DC motors of cassette recorders. However, if the...