Class A JFET Opamp Circuit
First Generation design that means it is not our latest design. …
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HIGH PASS ACTIVE FILTER COLLECTION
This is a collection of inverting and non-inverting active high pass filter circuits. I included one, two three, four and six pole filter circuits. You can change the component value ratios shown to achieve any frequency cut-off you may need. The circuit does not specify an operational Amplifier. The circuits should be used to select the needed resistor and capacitor components for a particular frequency knee and slope.
60Hz Notch Filter
High input impedance Amplifiers are ideal for buffering high impedance networks. Here a twin-T notch filter is shown to reject 60Hz signal content by more the 60dB. Small size, low valued capacitors can be used at such a low frequency with high valued resistors when using a CMOS op Amp…
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