[sdiy] IR3109 (OTA-based) filter question

[jh.]

> You should be able to get an output from each stage of the ladder in the
> 2044 using a separate diff amp.
> Have a look at Tony A's Multiladder Filter - it has an output on every
rung.
>
> One question is whether the ladder will tolerate having the first stage
> capacitor values switched thru an analogue switch...

Just guessing here, but it might even work "better": Switching off the cap
in
an OTA filter with feedback means removing the compensation capacitor of
an opamp (sort of critical). Removing the cap from one of the first 3 stages
of a 2044 means just leaving a pair of current mirrors. Can't say for sure,
but I'm confident to say try it.

JH.