[sdiy] National UAF100 filter Chips

[Ken MacBeth]

Hi Steve, I actually have 3 of these AF100 filter chips- large metal can- 12 legs, I think. I also have the National Semiconductor data for that chip too. I have often thought that I'd like to design something around it- but it's just getting time to do it. If you want the data, I can scan it!
Cheers, Ken

Steve Allen <snd_audio at yahoo.com> wrote:
Oooopppsssss;
It's the AF100 from National Semi, which is a
Universal active filter. It's not a switched cap chip.
Sorry about that.



--- synth at oldmail.charlielamm.com wrote:

> 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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> 
> 



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