We found this circuit in the May 1983 issue of Radio Electronics magazine. The integrated circuits are from that time. Note the supply voltage.
We found this circuit in an old 1980s documentation. The circuit can be implemented with modern...
This circuit is from a Linear datasheet. The circuit provides a 5 m voltage with 40 mA from an AA...
The components of this filter are calculated using conventional formulas (see mathematics section of...