This low-power circuit was found in the March 1990 issue of Radio Electronics magazine. It consists of a tone control solution for portable turntables.
This new Texas Instruments component consists of an inductive proximity detector that can be used...
This preamplifier for phonographic capsules using FET was found in 90s American documentation....
This polarity inverter circuit for voltages down to about -12 V was found in the December 1992...