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'[EE]: Audio low-pass filter'
2001\01\12@094148 by Edson Brusque

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Hello,

   I'm still needing a low-pass filter for an audio application that I
could control with a PIC.

   I've tried to find MAX29X parts, but with no sucess. Even Maxim doesn't
have this parts in stock so I couldn't buy it.

   Someone can give me a circuit of a low-pass filter that could be
controled with a clock, like the MAX29X, or with a 0-5V voltage, like a VCF?

   The filter have to cut from about 200Hz to 4000Hz.

   Thank you very much,

   Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
(47) 323-2685  /  (47) 9993-6453
Blumenau  -  SC  -  Brazil
-----------------------------------

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2001\01\12@113155 by Dan Michaels

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Brusque wrote:
>    I'm still needing a low-pass filter for an audio application that I
>could control with a PIC.
>
>    I've tried to find MAX29X parts, but with no sucess. Even Maxim doesn't
>have this parts in stock so I couldn't buy it.
>

There are a lot of older/other switched-cap filters around,
like the MF10. Possibly not very hi-fi, though.

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2001\01\12@114835 by Bob Blick

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On Fri, 12 Jan 2001, Edson Brusque wrote:
>     I'm still needing a low-pass filter for an audio application that I
> could control with a PIC.
>     Someone can give me a circuit of a low-pass filter that could be
> controled with a clock, like the MAX29X, or with a 0-5V voltage, like a VCF?
>     The filter have to cut from about 200Hz to 4000Hz.

Hi Edson,

I looked in the Digi-Key catalog and the LM13700N is $1.93 in singles. 2
caps and a few resistors and you have a 12db/octave voltage controlled
filter.

Cheers,

Bob

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2001\01\12@135630 by Dan Michaels

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Bob Blick wrote:
.....
>I looked in the Digi-Key catalog and the LM13700N is $1.93 in singles. 2
>caps and a few resistors and you have a 12db/octave voltage controlled
>filter.
>

Anyone have actual experience using these filter thingies in "audio"
apps, like Edson is after? IIRC, they produce large phase shifts on
the signals, and may distort sounds.

- danM

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2001\01\12@143400 by Bob Blick

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On Fri, 12 Jan 2001, Dan Michaels wrote:

> Anyone have actual experience using these filter thingies in "audio"
> apps, like Edson is after? IIRC, they produce large phase shifts on
> the signals, and may distort sounds.

You can build any of the classic types of filters out of them, with all
the characteristics of said filters. As far as sound goes, you've been
listening to those types of circuits all your life. Nothing wrong with
phase shift and distorted waves.

Cheers,

Bob

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