Doepfer

.. and for a 1V/oct compatible CV you need an additional exponential
converter as the procedure described by Florian generates a linear CV.

Btw. we are still about to develop the A-100 frequency to cv converter. The
most complicated part of the circuit is to create a clean (sine or triangle
or rectangle) wave from any (or at least most) audio input signal. The rest
of the module (generating the CV from a clean wave) is already working.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Florian Anwander
> Gesendet: Mittwoch, 5. April 2006 15:03
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: [Doepfer_a100] Re: "playing" without a keyboard
>
>
> Hi,
>
> > Where can I find info on making gate and cv circuits?
> For creating a gate you simply might use the A-119 external input module
> or the A-167 comparator module.
>
> For the CV it is not that easy. I would recommend to use a ready made
> Fq/CV converter (as far as I remember Roland or Korg produced some in
> the eighties).
>
> An analogue Fq/CV-converter works like the following:
>
> 1.) Try to use a mainly sine or triangle like input wave
> 2.) Remove DC from the signal
> 3.) Clip the signal  -> this will create a rectangle wave
> 4.) differentiate the signal -> this will produce a spike-like signal
> similar to a very narrow pulse, but with positive and negative spikes.
> 5.) rectify the signal -> this will create positive spikes only.
> 6.) do a DC-coupled lowpass filtering -> this creates the CV.
>
> Florian
>
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>
> Yahoo! Groups Links
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