This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for component calculations are attached to the diagram.
This circuit was obtained in an old American publication from 1974. The supply must be made with 5 V...
Currents of a few milliamps are enough to drive loads up to 500 mA with this circuit. The...
Published with a power amplifier in the January 1985 issue of Radio Electronics, this circuit...