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Active Filters: Notch
Active Filter -- Main Page
Last Updated on: Monday, October 03, 2011 06:07 PM

Circuits Designed by Dave Johnson, P.E. :

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
29.85 MHz Notch Filter Schematic -  (electronic circuit added 7/03)
78 RPM & RIAA Phono Equaliser -  Multi Standard 78 RPM and RIAA Phono Equaliser handles all "standards" (added 6/07)
Adjustable 60Hz Filter -  On this page three adjustable notch filters configurations are shown . They can be used in your small pre-amp or amplifier project to filter out any HUM at 50 Hz ( European ) or 60Hz . By substituting the capacitors values in the bridge other frequencies can be used . All op-amps configuration requires a +/- voltage supply which can easily provided with a voltage divider made of two…. [Stepan Novotill' website]
Adjustable Audio Notch Filter -  (schematic added 9/02)
Audio notch filter audio frequencies 100Hz-10kHz -  A variable notch filter with both high and low pass filters.  For audio frequencies 100Hz 10KHz  (added 11/05)
Basic Introduction to Filters -  Application Notes on active, passive and switched capacitor filters, document in PDF format (app note added 4/02)

Build an adjustable high-frequency notch filter -  6-Feb-03 Issue of EDN  Although you can obtain universal, resistor-programmable switched-capacitor filters that are configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz. Further, the typically 16- to 20-pin packages do not include a continuous-time, antialiasing filter to prevent spurious signals from appearing at the output.... [Design Idea by John Ambrose, Mixed Signal Integration Corp, San Jose, CA]
Build an adjustable high-frequency notch filter -  6-Feb-03 Issue of EDN  Although you can obtain universal, resistor-programmable switched-capacitor filters that are configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz. Further, the typically 16- to 20-pin packages do not include a continuous-time, antialiasing filter to prevent spurious signals from appearing at the output.... [Design Idea by John Ambrose, Mixed Signal Integration Corp, San Jose, CA]
Closing the loop deepens notches -  7-Feb-02 Issue of EDN  Notch filters remove a single unwanted frequency from an input signal. They are also a vital component of pulse-shaping networks, such as time-averaging filters. You can tune a state-variable filter over a wide range by changing the time constants of its integrating amplifiers (references 1, 2, and 3].... [Design Idea by Tom Napier, North Wales, PA]
CW Filters -  Electroinic circuit design…. [from Harry Lythall's website]
Easy Parametric & Graphic Eq's Plus Peaks & Notches -  (circuit / schematic design added 6/06)
Electric Field Disturbance Monitor -  This schematic is the power supply and front-end sections of the field monitor that is discussed in more detail at Electric Field Disturbance Monitor. The system can detect human and animal motion by the electric fields they disturb. ….
Filter Akerberg-Mossberg (AM) Second Order Notch inverting -  ….(Circuit design added 06/09)
Filter Berka-Herpy (BH) Second Order Notch non-inverting -  ….(design added 06/09)
Filter Fliege Second Order Notch non-inverting -  Schematic only, no text included
Filter KHN (Inverting Input) Second Order Notch non-inverting -  Schematic only, no text included
Filter KHN (Non-Inverting Input) Second Order Notch inverting -  Schematic only, no text included
Filter Mikhael-Bhattacharyya (MB) Second Order Notch non-inverting -  ….(electronic schematic added 06/09)
Filter Sallen-Key (SK) Second Order Notch non-inverting -  ….(Circuit design added 06/09)
Filter Twin-T Second Order Notch I non-inverting -  ….(design added 06/09)
Filter Twin-T Second Order Notch II non-inverting -  ….(electronic schematic added 06/09)


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