We found this universal preamplifier circuit in a March 1994 Electronics Now. It has several types of equalization depending on the signal input.
This boost amplifier was found in a Popular Electroniics from the 90s. The circuit operates up to...
This simple transistorized radio for listening on a crystal phone was found in a Japanese...
The circuit presented, from 2006, serves to control loads at a distance, robots, etc. It can be...