Based on the Linear Technology LTC2054, this -48 V circuit was found in a 2005 manual. The circuit is powered with 5 V and can be used as a shield.
Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of...
This adjustable source from 2 to 15 V uses transistors from the 60's, as indicated in the...
Found in a 90s Popular Electronics, this circuit is intended for amplifying analog video signals....