Web DiscoverCircuits.com

Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 28,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to material posted by the designer. 
Please let us if you would like us to link to your design.

HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info

Active Filters: Notch
Active Filter -- Main Page
Last Updated on: Saturday, June 27, 2009 04:42 PM

Circuits Designed by Dave Johnson, P.E. :

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

78 RPM and RIAA Phono Equaliser:  Multi Standard 78 RPM and RIAA Phono Equaliser handles all "standards" (added 6/07)
Adjustable 60Hz Filter:  to filter out any HUM that may be picked up by a noisy power supply or long wire connection (added 4/02)
Adjustable Audio Notch Filter:  (schematic added 9/02)
Akerberg-Mossberg AM Second Order Notch inverting:  (electronic design added 6/07)
Basic Introduction to Filters:  Application Notes on active, passive and switched capacitor filters, document in PDF format (app note added 4/02)
Berka-Herpy BH Second Order Notch non-inverting:  (electronic design added 6/07)
Build an Adjustable High Frequency Notch Filter:  02/06/03 EDN Design Ideas  /  (added 12/04)  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. Furr,  typically 16to 20-pin packages do not include a continuous-time, antialiasing filter to prevent spurious signals from appearing at  output....
Closing the Loop Deepens Notches:  05/07)/02 EDN Design Ideas  /  (added 12/04)  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). ...
CW Filters:  (electronic circuit added 7/03)
Easy Parametric and Graphic Eq's Plus Peaks and Notches:  (circuit / schematic design added 6/06)
Fliege Second Order Notch non-inverting:  (electronic design added 6/07)
Helical Resonator Notch Filter:  (electronic circuit added 7/03)
High Q Notch Filter:  National Semiconductor Application Notes first published28-Jun-1996 (app note added 4/02)
High-Q 60-Hertz Notch Filter:  This high-Q notch filter is based on the "Twin-T" design. It produces a very deep notch in the response curve at about 59.7 Hz. This is useful to remove 60-Hz hum and noise from audio recordings or live performances. Response is down over -60db at the center point. The LM3900 Norton opamp was chosen since it doesn't require extra components for single-supply operation.... (circuit design added 7/06)
KHN Inverting Input Second Order Notch non-inverting:  (electronic design added 6/07)
KHN Non-Inverting Input Second Order Notch inverting:  (electronic design added 6/07)
LB-5: High Q Notch Filter:  National Semiconductor Application Note   (app note added 2/06)
Mikhael-Bhattacharyya MB Second Order Notch non-inverting:  (electronic design added 6/07)
Notch Filter is DC Accurate:  03/02/95 EDN Design Ideas / (added 7/02)
Notch Filter is Insensitive to Component Tolerances:  03/02/00 EDN-Design Ideas  / (added 2/06)   
Notch Filter uses Only Lowpass Filters:  04/10/97 EDN Design Ideas / (added 6/06)
Notebook Power Supply has Two Outputs:  03/03/94 EDN-Design Ideas / (added 3/06) The notebook-computer supply in Fig 1 powers the 5V logic and derives an adjustable -24V supply for an LCD's backplane. The design uses only a high-efficiency buck regulator (Si9150) and an NMOS/PMOS, dual-power-FET chip set (Si9943), eliminating the extra parts required when you implement both supplies independently. Because of the low on-resistances of the dual FETs, this circuit can achieve better than 92% efficiency at 7.2V input and full-load output (7.6W)....
RC Notch Filter Twin T:  The twin T notch filter can be used block an unwanted frequency or if placed around an op-amp as a bandpass filter. The notch frequency occurs where the capacitive reactance equals the resistance Xc=R and if the values are close, the attenuation can be very high and the notch frequency virtually eliminated. (added 4/02)
Reverse RIAA Equaliser:  Test phono preamps for correct equalisation, or convert unused phono inputs.  (circuit added 6/07)
Sallen-Key SK Second Order Notch non-inverting:  (electronic design added 6/07)
Simple Easy Parametric and Graphic Eq's Plus Peaks and Notches:  (circuit / schematic design added 6/06)
Switched-capacitor IC forms notch filter:  09/30/99 EDN-Design Ideas / (added 10/06) 
Twin-T Second Order Notch I non-inverting:  (electronic design added 6/07)
Twin-T Second Order Notch II non-inverting:  (electronic design added 6/07)
Variable notch filter with both high and low pass filters:  (schematic / circuit added 2/07)

 
 
HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info

 Linking is welcomed but COPYING any content or graphics to your web site is expressly prohibited.

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy