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.
This setting appears multiple times on the site from different sources. This is from a 2000 manual...
September 2016 - Mouser Electronics is making available the new TVS of Littelfuse TP1.5KE to...
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...