[sdiy] Voltage control of Haible’s Deboo Integrator

Tom Wiltshire tom at electricdruid.net
Thu Apr 4 20:36:16 CEST 2019

Hi Ulfur,

You should definitely have a dig around in the archives for this topic - there have been several discussions on the theme in the past.


The "Polymoog resonator question” thread from last October covers some of this ground too. Also Bernie Hutchins posted links to some excellent Electronotes material on the theme:


One question: if you’ve got a whole bank of filters at different frequencies, why would you want voltage-controlled *tuning*? I can see the point of voltage controlled *amounts* (which is simple - just stick a VCA after each filter, it's a glorified VC-mixer) but I don’t understand what you hope to gain from making the tuning variable. The filter bands are narrow, so they’d soon just overlap.


       Electric Druid
Synth & Stompbox DIY

> On 4 Apr 2019, at 18:47, ulfur hansson <ulfurh at gmail.com> wrote:
> hello list,
> i’m very intrigued by the sounds of Jürgen Haible’s string filter.
> has anyone seen an implementation of an individual Deboo integrator/resonator that offers voltage control? 
> i see that each resonator is tuned with a resistor and capacitor, but perhaps replacing RTune with a VCA element could offer voltage controlled tuning?
> in any case, i’d love to hear your thoughts on banks of VC resonators!
> best,
> Sent from outer space
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