[sdiy] VCO control Range

[Jerry Gray-Eskue]

Thanks for the answer,

I have seen how the CVs are added, Course and Fine to set the initial
frequency, the FM that normally is a linear frequency modifier, often an AC
voltage for tremolo etc. and the 1V/Octave inputs that control the offset of
the initial frequency, I was just not clear that negative 1V/Octave voltage
are valid.

 Thanks again,

 -Jerry

-----Original Message-----
From: Paul Schreiber [mailto:synth1 at airmail.net]
Sent: Friday, August 28, 2009 8:49 AM
To: Jerry Gray-Eskue; Synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] VCO control Range


Negative means the frequency goes *down*. All the CVs are *added together*
internally in the VCO: the Coarse/Fine pots, the FM CV and the 1V/Oct CV.

Paul S.

----- Original Message -----
From: "Jerry Gray-Eskue" <jerryge at cableone.net>
To: <Synth-diy at dropmix.xs4all.nl>
Sent: Friday, August 28, 2009 8:09 AM
Subject: [sdiy] VCO control Range


>
> This may be a silly question but I am do not have a clear idea of how this
> works.
>
> The 1 volt per Octave input on VCOs clearly means that if your input
> voltage
> goes up one volt the frequency out doubles to be one octave up. Simple
> enough, the question is what is the real range of voltage VCOs work at?
>
> I see a number of references to calibrating a VCO using 0 volts and steps
> of
> 1 volt above 0 volts like 0,1,2,3,... up to a max of 10 volts. So from
> this
> it looks like a VCO is expected to track positive voltages up to its max
> range capability. What is not clear to me is if the VCO tracks Negative
> input voltages i.e. -1,-2,-3.. to -10 volts.
>
> Any help clearing this up will be appreciated.
>
> - Jerry
>
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