Variable Bandpass Audio Filter Circuit

  
This circuit is a variable audio bandpass filter that has a low cutoff variable from about 25 Hz to 700 Hz and a high cutoff variable from 2.5 kHz to over 20 kHz. Rolloff is 12 dB/octave on both high and low ends.
Variable Bandpass Audio Filter Circuit - schematic

R2-a-b and R6-a-b are ganged potentiometers for setting lower and upper cutoff frequencies, respectively.



Recommended videos


  • #243: Mini-review
     
  • low cut - high pass active R-C audio filter (schematic)
    Duration: 5:52.
  • Active Band Pass Filter
    Duration: 11:45.

News


  • The Boston Globe
    The Boston Globe It could also mean using one of a suite of “smart ” that can tamp down a jet engine or boost a friend's voice at a noisy cafe. Early reviews suggest the Here One is still working out some kinks in connectivity qua
     24 February 2017
  • The Verge
    The Verge The thing to know with the way Here One uses this technology is that, right now, what you can do with and the "Live Remix" — an equalizer in the app that lets you raise or lower specific frequencies of the world around you &
     21 February 2017
  • Forbes
    Forbes Speaking to Kraft, I can also imagine a future in which the Doppler app allows users to download specific that are designed for individual therapeutic purposes. Right now, users can select filters to nix the sounds of open offices or
     13 December 2016
  • TWCN Tech News (blog)
    TWCN Tech News (blog) converter software fre:ac isn't a look but better than mostYes, fre:ac does support the addition of various before converting. We did not use this feature, so we're unable to say for sure how well it works, if at a
     12 December 2016
  • The Next Web
    The Next Web Once you've recorded a short clip (Riffjam allows you up to 10 seconds, but I found that a couple of seconds' worth works best), just choose from a range of and let the app do the rest. You can then send your creation to another
     4 November 2016
  • ARRL
    The content on this download is divided into folders which contain software for a variety of ham radio applications. You'll find handy software tools for decoding CW, creating custom DSP , and more. Bonus files include ARRL screensavers <
     17 August 2016
  • InfoQ.com
    Liary Howler.js Has 2.0 Release to Make Some Noise about... Released Simpson describes howler.js as a "modular liary" saying that it allows for "a lean core that can be extended to add more advanced functionality, such as the wealth of tool
     26 July 2016
  • GearNuke
    Uncharted 4 has some unlockable render modes including a cel-shared filter and various . These can be unlocked by using points that are acquired by finding the collectibles in the game. The following render modes and can be ...
     14 May 2016
  • Wired
    Wired More importantly, Smule has ported its technology to enhance an often missing feature in other video sharing apps. While apps like Viddy allow you to add background music to a video, Strum provides as well. Each of the 21 filters
     13 December 2012

.