The HV2405E integrated circuit is not very common these days. This circuit was found in the August 1998 issue of Electronics Now magazine. The current is a few tens of milliamps.
This circuit was originally designed to power the CB18698's MSX interface, but it is suitable for...
This filter that rejects determines frequency (notch) was found in a Popular Electronics of 1993....
This circuit for measuring bridges was found in the October 1995 issue of Electronics Now...