[sdiy] National UAF100 filter Chips

[synth at oldmail.charlielamm.com]

I think you mean the LMF100?  I don't know of a national UAF100....the
LMF100 is a popular switched cap chip.

I have tried using MF10s to build a VCF which I think are fairly similar
to the LMF100, there are lab notes on this page:

http://www.charlielamm.com/synth/#mf10

I was going to show a VCF I breadboarded out of the MF10's on this page,
it "worked"  but it sounded sufficiently crappy that I figured why bother 
and never linked to it.

The main issue for me: the MF10s just didn't sound that good--to me
anyway--for the amount of effort that went into designing them in a VCF.  
Maybe the 100's sound better?  Dunno.  It's always worth messing with.

Also, RA Penfold designed and published a stomp-box phase shifter using
MF10's or LMF100's (dont remember which) set up as notch (allpass? don't
remember either) filters, I think, where he uses the basic
switched-filter-chip-as-VCF idea.  But I can't find the link anymore but
maybe some other reader has it.




On Wed, 11 Aug 2004, Steve Allen wrote:

> Hello All,
>  I've been lucky enough to acquire a bunch of National
> UAF100 Filter chips. Has anyone used these for a VCF
> module? Seems simple enough.....is it?
> 
>  Steve
> 
> 
> 		
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