Suggested by General Electric in a 1980s publication, this circuit is intended for coupling alternating signals, with the transistor being polarized in its linear region.
This control for bass, midrange, and treble was found in the March 1995 issue of Electronics Now...
This high-power shield is isolated from the control. The circuit was found in the June 1995...
This circuit was found in a Popular Electronics of the 1990s. The sensor is a rotating mechanical...