[sdiy] Vox Continental waveforms

[John Henson]

Hi Tom and List,
I am repairing a Connie 71 at the moment, and I was scoping it earlier 
today.
Real Connies just use the drawbar mixing technique and don't have flute or 
brass filter types.
Each harmonic of the dividers is low pass filtered as you say, and yes the 
waveform is like a sharksfin, with a rounded front and a steep drop of the 
tail of the waveform.
One voice card on it had an open circuit capacitor on it and the waveform 
fed to the bus was a pure squarewave.
Soundwise the result is remarkably smooth, more harmonics than a sine but 
nothing like a sawtooth.
Regards
John
----- Original Message ----- 
From: "Tom Wiltshire" <tom at electricdruid.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, June 04, 2009 8:35 PM
Subject: [sdiy] Vox Continental waveforms


> Hi All,
>
> Does anyone know what the Vox Continental waveforms look like? Has
> anyone with a scope also got a Connie? Pretty pleeeze!
>
> The reason I ask is that I'd always assumed that they're square waves
> (straight out of a divider) but today I learned that (unusually for a
> divider organ) the Vox put filters on every divider output, as well
> as on the mixed busbar outputs for the 'flute' footages (typical of
> most divider organs).
>
> The circuit diagram shows a simple RC filter, so I'm expecting a
> "shark's fin" waveform (sort of curved trianglish/sawish waveform).
>
> Quotes from a designer of the Continental on this page below say the
> wave is a "sawtooth". I can't believe that's an accurate description.
>
> http://www.combo-organ.com/Vox/Single/index.htm
>
> Thanks,
> Tom
>
>
>
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>


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