This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This instrument was obtained in a documentation for radio amateurs of 1976. The circuit measures...
This circuit was found in a computer publication from the 1970s. The transistors can be the BD135...
September, 2017 - Mean Well DC-DC regulators from 10 to 30 W are already available on Mouser...