[sdiy] Band-Pass Filter with CV control of Frequency Cut-off?

Quincas Moreira quincas at gmail.com
Sat Mar 31 17:41:50 CEST 2018


maybe adapt the Crybaby filter to use CV?
https://www.electrosmash.com/crybaby-gcb-95

On Sat, Mar 31, 2018 at 9:16 AM, Tom Wiltshire <tom at electricdruid.net>
wrote:

> If you want CV control with no vactrols, you’re looking at an OTA or VCA.
> If you want bandpass, it’s going to need two slopes, so you need two OTAs
> or VCAs. In short, it’s not going to be *much* less complicated than the
> SVF.
>
> I guess you could do it with one VC-LPF stage followed by one matching
> VC-HPF stage. That might be somewhat simpler than a full SVF. THAT2162 is a
> nice dual VCA which would give you exponential control. They have an
> application note showing the construction of different filter stages with
> their VCAs:
>
> http://www.thatcorp.com/datashts/dn130.pdf
>
> HTH,
> Tom
>
> ==================
>        Electric Druid
> Synth & Stompbox DIY
> ==================
>
> > On 31 Mar 2018, at 13:14, Justin Owen <juzowen at gmail.com> wrote:
> >
> > Hello,
> >
> > Can anyone point me to some schems of a reasonably simple, analogue
> band-pass filter with CV control over the frequency cutoff - that *isn't*
> the well-established two pole multi-mode architecture and I guess - at the
> other end of the scale - isn't a passive filter with the resistor/s
> replaced by a vactrol.
> >
> > I'm looking for something to use as part of a feedback effect I've been
> tinkering with - so I don't need anything too fancy or highly-specced but
> the standard two pole multi-mode is currently more complex than my needs.
> >
> > Is there such a thing?
> >
> > Thanks!
> >
> > / Justin
> >
> >
> >
> >
> >
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-- 
Quincas Moreira
Test Pilot at VBrazil Modular
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