> -----Ursprungliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
> Gesendet: Dienstag, 18. November 2014 08:39
> An: doepfer_a100@yahoogroups.com
> Betreff: 1 Rate of change to CV and Cv change to gate
>
>
> Hi,
>
> I'm wondering how to do two things.
> 1) To create a CV based (proportional to) on the rate of change of another CV
> 2) To create a gate when there is a step in a CV. This is particularly but not exclusively the output of a Intellijel
> uScale - so when there is a new pitch I would like to create a gate.
>
> Hoping there is maybe a simple solution,
>
> David

This function was called earlier "new pitch detector". If I remember correctly such a module was available for the FORMANT
synthesizer. So far nobody was asking for such a function. It's not very difficult if you have some experience with electronics:
nothing but a differentiator (i.e. a capacitor/resistor with buffer, nothing but the "simple high pass" shown on the A-100 DIY
page). One may add a full wave rectifier if both (positive and negative CV changes) should generate a positive voltage (otherwise
the output of the differentiator generates a negative voltage for negative CV changes). To derive a gate a comparator with
adjustable threshold ("sensitivity") has to be added (e.g. A-167).

Best wishes
Dieter Doepfer