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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