TL071 bandpass filter, any ideas? - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th March 2012, 01:31 PM   #1
diyAudio Member
 
Join Date: Dec 2011
Default TL071 bandpass filter, any ideas?

Anyone can give me an idea of how I can build a bandpass filter using a single supply amplifier please, between 200Hz to 20kHz please. Thanks in advance regards
  Reply With Quote
Old 12th March 2012, 05:02 PM   #2
diyAudio Member
 
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
Yup!

First of all you would do it as a low pass plus a high pass. If it's a first order you want then you can do it with a single amp, esp with a jfet device. You make one Resistor 10x the value of the other and for economy you would make the bigger one the high pass (so you can get a smaller capacitor.

For 2nd order and above follow textbook examples. This will require at least one op amp per filter or use half a TLO72.
  Reply With Quote
Old 12th March 2012, 05:07 PM   #3
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Go to the Texas Instuments site and search for ap. note sloa058. All you ever wanted to know about opamps on single rails.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 12th March 2012, 05:09 PM   #4
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
You can use a multiple feedback filter. Google it, there are some online calculators.
__________________
LW1DSE
  Reply With Quote
Old 12th March 2012, 06:19 PM   #5
diyAudio Member
 
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
What do you need the filter for?

Osvaldo, A MFB filter night be a little tough for a beginner, do you not think?
  Reply With Quote
Old 12th March 2012, 09:16 PM   #6
diyAudio Member
 
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
BTW Fiat Uno, if that application note is the one I think it is, then please take my advice and IGNORE the section on bandpass filters. You are not trying to isolate a very narrow band, quite the contrary, and those filters are both complicated to build and can very easily pick up oscillation. Look at the parts on Low Pass and High Pass filters - that is what you will need. One of each (though why you want to filter out things above 20kHz, I still don't know).

CT
  Reply With Quote
Old 12th March 2012, 10:22 PM   #7
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
The only reason I can see someone wanting a 200hz to 20 khz bandpass is if you are trying to attenuate everything over 20khz and everything under 200hz ......

I can see attenuating everything under 200hz if you were building an active crossover and had a seperate filter for the sub 200hz range but over 20khz no one can hear and most all music isn"t going to have much if any music in the 20khz+ range ......
  Reply With Quote
Old 14th March 2012, 02:31 PM   #8
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Quote:
Originally Posted by ChristianThomas View Post
What do you need the filter for?

Osvaldo, A MFB filter night be a little tough for a beginner, do you not think?
For this reason I suggested to use online calculators that work fine.
One of them is:
Multiple Feedback Low-pass Filter Design Tool

Salu2.
__________________
LW1DSE
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Filter sequence in a Bandpass filter question BachAudioDK Multi-Way 3 28th January 2012 10:20 PM
Kilroy was...a bandpass filter? Carlp The Lounge 3 23rd March 2011 09:20 PM
Stereo bandpass filter billman Analog Line Level 4 10th November 2010 06:47 PM
Stereo bandpass filter billman Everything Else 1 10th November 2010 06:22 AM
Bandpass Filter on a Subwoofer alexmoose Subwoofers 4 31st December 2006 04:05 AM


New To Site? Need Help?

All times are GMT. The time now is 11:25 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2