This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The number in parentheses corresponds to the second channel, for a stereo version.
This treble and bass control drains some milliamperes from a 12 V supply and can be used with any...
This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time...
This circuit was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz...