[sdiy] Switched cap filters

[Tom Arnold]

On Thu, Oct 12, 2006 at 09:32:44PM -0700, JAMES GALLANT wrote:
> I'm curious as to what the list thinks about switched capacitor filters in 
> general and more specifically the Nat'l Semi LMF100.

I'm not a fan of the LMF100 however for some applications switched cap
filters are pretty nifty.  Specifically analog delays.  a switched cap
filter lets you adjust your anti-alias filter on your BBD based delay so
that it properly tracks the BBD clock itself.  Of course this can also be
used on low-memory digital delays and in fact I first got enamored with the
idea of Switched Cap Filters was when I was looking at the EH16 delay.

The LMF10 and LMF100 are pretty crappy filters tho.  Linear Technology has
some good ones ( I think Blacet used one of these in the Time Machine ).  
Another company that makes some nifty filters is MSI ( www.mix-sig.com ) but
they are harder to source then Linear Tech. ( look at the MSELP ).

-- 
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 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
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