[sdiy] Filter problems

[Guy McCusker]

Are you really using 5532s there? Does it behave the same way with a FET op
amp (e.g. TL07x or similar) instead? I would have thought the input bias
current of a 5532 made it unsuitable for use as an integrator at all, and
especially with a device like a 2164 which I understand is fussy about its
current output.

Guessing really...

On Sat, 27 Jan 2018 at 16:30, Tim Ressel <timr at circuitabbey.com> wrote:

> Hi,
>
> Filters can be a pain. I've got one that is misbehaving. Here is a link
> to the schematic:
>
> https://www.dropbox.com/s/acjvwb17nmuok1n/PrismFilter.pdf?dl=0
>
> At low CVs it filters fine, but as the freq cv hits around 2 volts the
> behavior gets odd. I start seeing a rising DC bias on all the outputs.
> At about 3 volts all the outputs rail positive.
>
> Any help is appreciated. Thanks for playing!
>
> --
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
>
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