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Active Filters: Band Pass, Page 1
#'s - B       C - K       L - Z
Active Filter -- Main Page
Last Updated on: Saturday, August 30, 2014 10:27 AM

 
Circuits Designed by Dave Johnson, P.E. :
  • 125Khz Ultra Pure Sine Wave Signal Source - For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% … [Hobby Corner Circuit by Dave Johnson]  Added June 2005 


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

125Khz Ultra Pure Sine Wave Signal Source- For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01%… [Hobby Corner Circuit by Dave Johnson]

12dB/Octave 2-Way Xover- Linkwitz-Riley alignment and phase coherent (uses the P09 Rev-B PCB)   …

24 dB/Octave 2/3-Way Linkwitz-Riley electronic crossover- The Linkwitz-Riley filter featured here has (almost) perfect phase-coherency, with no peaks or dips at the crossover frequency. The design is adaptable to 2-way or 3-way (or even 4-way) operation, and all formulas) …

29.85 MHz Bandpass Filter Schematic- …

45 to 90Hz hum filter- These emit noise to confuse or agitate insects or animals.  This is one of the better and more popular brands. It emits bursts of pulses at different frequencies. I did not find any spider webs inside this unit… [Circuit by Stepan Novotill]

A Basic Introduction to Filters: Active, Passive & Switched-Capacitor- National Semiconductor Application Note…

A Simple Method of Designing Multiple Order All Pole Bandpass Filters by Cascading 2nd Order Sections- AN27A Linear Technology Presents two methods of designing high quality switched capacitor bandpass filters. Both methods are intended to vastly simplify the mathematics involved in filter design by using tabular methods. The text assumed no filter design experience but allows high quality filters…

Active 2nd Order Filters- The figures below illustrate using opamps as active 2nd order filters. Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the voltage amplitude for each octave of frequency increase or decrease outside the passband…

Active Bandpass Filters- …

Akerberg-Mossberg (AM) Second Order Bandpass inverting- Schematic only, no text included…

Akerberg-Mossberg AM Second Order Bandpass inverting- …

BandPass Filter- This bandpass filter is in fact a combined high- and lowpassfilter. The first stages are a highpass (f>70MHz) and the last stages a low pass (f<180MHz) . The lost of this filter is several watts when driven with 20[Watts], but the output signal is (when adjusted with a spectrum analyser) very clean…

Bandpass filter features adjustable Q and constant maximum gain- 3-Mar-05 Issue of EDN  Applications such as audio equalizers require bandpass filters with a constant maximum gain that's independent of the filter's quality factor, Q. However, all of the well-known filter architectures—Sallen-Key, multiple-feedback, sta… [Design Idea by Herminio Martínez, Joan Domingo, Juan Gmiz, and Antoni Grau, Technical University of Catalonia, Barcelona, Spain]

Bandpass Filter Single Opamp- A band pass filter passes a range of frequencies while rejecting frequencies outside  upper and lower limits of  passband. The range of frequencies to be passed is called  passband and extends from a point below  center frequency to a point above  center frequency where  output voltage falls about 70% of  output voltage at  center frequency.…

Bandpass Filters- …

Band-pass Network- Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.…

Band-reject filter includes compensation- 04/13/00 EDN-Design Idea  Some band-reject LC filters employ a reactance to decouple individual resonators. One such filter uses relatively small shunt inductors to decouple series resonators, known as a top-L coupling.  This type of coupling readily achi… [Design Idea by Richard M Kurzrok, RMK Consultants, Queens Village, NY]

Basic Introduction to Filters- Application notes on active, passive and switched capacitor filters, document in PDF format…

Berka-Herpy (BH) Second Order Bandpass non-inverting- Schematic only, no text included…

Berka-Herpy BH Second Order Bandpass non-inverting- …

Biquad Active Bandpass Filter Schematic- …

 

Active Filters: Band Pass - #'s - B       C - K       L - Z


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