This notch filter was found in National Semiconductor documentation from the 1980s. Operational amplifiers are from that era. The configuration can be adapted to use modern operational amplifiers.
This operational filter configuration was obtained in a 1980s publication. The calculation is made by the...
The sensor in this simple circuit is a NTC (Negative Temperature Coefficient) resistor. NTCs with...
This circuit is from a high voltage tube source. It does not include the filament voltage that must...