[sdiy] understanding the CAP arrangement on the PT2399 (filters)

[Tom Wiltshire]

This'll help you work out the cutoffs too:

http://sim.okawa-denshi.jp/en/OPtazyuLowkeisan.htm

T.

On 6 Oct 2009, at 03:22, Dan Snazelle wrote:

>
> looking at
>
> http://sites.google.com/site/hearnmorley/synth-diy-resources/ 
> GHSYN2bWeb.pdf?attredirects=0
>
> or even at the PT2399 datasheet, i have never understood the signal  
> flow in the "internal opamps"
>
> to me it looks like the input is connecting VIA r5 to the first  
> opamp which has a 1n in its feedback loop. but is r6 connecting  
> into the next opamp or into the feedback loop of the first one? and  
> there is similar confusion on following the path (and determining  
> the cutoffs) on the additional internal opamps
>
> thanks for any help
>
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