This high input impedance tone control circuit was found in American documentation from the 1980s. Equivalent operational amplifiers and FTEs can be used.
This circuit is from an article in the December 1988 issue of Radio Electronics magazine that...
Found in a 1966 American publication, this circuit generates a 25 MHz rectangular signal for...
This circuit is based on the DCP010515 integrated circuit found in the August 1998 issue of...