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 filter is intended for 60 Hz noise suppression in amplifiers. We found it in American...
This circuit is intended for use with common oscilloscopes having been found in documentation on...
This transmitter for the 80-meter band (3.5 MHz) was found in an old documentation for radio...