[sdiy] Weird MFOS VCO max CV problem

[Ove Ridé]

I've had a similar problem with a VCF. I don't know what the cause is
at this point, but I suspect it may have to do with over-spec control
current to a ca3080, which is an OTA. Does MFOS VCO utilize any OTAs,
such as the ca3080, ca3280 or LM/NJM13x00?

On 9 April 2012 19:26, Travis Thatcher <recompas at yahoo.com> wrote:
>
>
> I've had a MFOS VCO in my rig for some time now and its more or less
> been functioning well.  I finished it as a build a friend started and
> had some initial problems but after going through the circuit everything seemed to be okay. The problem I'm having is that if you feed it a CV
> above a certain threshold, when the pitch is high, the VCO just turns
> off. I suspect the summing op amp for CV is just getting stuck in a
> state where its hitting the rails, but I've tried a few different chips
> to be sure that's not the issue.  Not really sure where else to poke
> around to troubleshoot this. Has anyone else ever had this problem?
>
> Travis Thatcher
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-- 
/Ove

Blog: <http://blog.gg8.se/>

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