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Old 10th March 2006, 12:48 PM   #1
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Default design software for active filter

Hi,

I'm looking for design software, preferably freeware.
I know the transferfunction already as I have designed a passive filter for my 2 way speaker. It more or less amounts to LR4 at 3 kHz but has a peak in the LF part.

Now I want the same in an active form, to be build with opamps (and a opamp powerstage, e.g. gainclone).

Any suggestions?
Thanks,
SWdick.
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Old 10th March 2006, 12:50 PM   #2
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Send a message via Yahoo to Elso Kwak
Filter-pro from Burr-Brown, now TI
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Old 10th March 2006, 08:03 PM   #3
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Thanks, Elso.

Nice picture.
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Old 10th March 2006, 08:09 PM   #4
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Quote:
Originally posted by dick van nierop
Thanks, Elso.

Nice picture.
URVW Dick!
The DOS version worked better for me.
I can send it to you if you like.

BTW the picture is not me me! I am fat and ugly, hahahahaha


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Old 11th March 2006, 07:15 PM   #5
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Hi Elso,

I downloaded the programm. It works well but can only do LF and HF filters. What about e.g. LT, baffle step, etc.?
Any other programms available?

Anyone experience with more complicated topologies in order to minimize the number of opamps?
For a full filter I would need about 20 opamps. Seems a bit much, doesn't it? I don't think this will contribute to the overall quality.

Thanks,
SWDick.
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Old 11th March 2006, 07:24 PM   #6
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Lightbulb s/w

There was a thread in the past about this subject Dick. Do a search; others came with more suggestions.
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Old 17th March 2006, 07:21 PM   #7
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Found a useful tool: 5Spice. Very easy.
I gather I can use it non commercially for free.

No optimalisation though.

Dick
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Old 20th March 2006, 04:25 PM   #8
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nuhertz has filter free (and pro) online. good stuff.
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