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12th March 2012, 05:02 PM
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#2 |
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diyAudio Member
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
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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. |
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12th March 2012, 05:07 PM
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#3 |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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Go to the Texas Instuments site and search for ap. note sloa058. All you ever wanted to know about opamps on single rails.
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Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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12th March 2012, 06:19 PM
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#5 |
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diyAudio Member
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
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What do you need the filter for?
Osvaldo, A MFB filter night be a little tough for a beginner, do you not think? |
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12th March 2012, 09:16 PM
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#6 |
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diyAudio Member
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
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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 |
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12th March 2012, 10:22 PM
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#7 |
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diyAudio Member
Join Date: May 2006
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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 ...... |
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14th March 2012, 02:31 PM
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#8 | |
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diyAudio Member
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
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Quote:
One of them is: Multiple Feedback Low-pass Filter Design Tool Salu2.
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