This circuit was suggested by National Semiconductor and is present elsewhere on this site. The LM2575 is not very common today and should be mounted on a heatsink.
Found in a documentation for radio amateurs from 1977, this circuit is intended to power equipment from...
This circuit was obtained from a 1978 Practical Wireless. It makes a speaker emit sound when there...
This circuit was obtained from a Radio & Electronics Constructor from March 1976. The magazine no...