We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power version and a higher power version with MOSFET (VMOS) of the time.
For analog lines, this circuit was found in the August 1994 issue of Electronics Now magazine. The...
This low-noise hydrophone circuit was found in a 1980s Linear Technology component manual. The...
This circuit is from an Electronic Design of the 90's. The circuit can be implemented with more...