We found this universal preamplifier circuit in a March 1994 Electronics Now. It has several types of equalization depending on the signal input.
This circuit was found in a Popular Electronics from the 90s. The circuit uses an ultrasonic...
This circuit provides a few watts of output and can be used in the car as an auxiliary amplifier....
This reflectometer or standing-wave ratio meter (SWR) was found in a 1980s American documentation. The...