Triangle VCO help please

[mark verbos]

as it turns out I made the biggest of all chump mistakes. The scope lead was
switched to 10x mode. so the waves were actually the right size. doh@!#$$%&*

thanks magnus

mark

Magnus Danielson wrote:

> From: mark verbos <a0284520 at addcom.de>
> Subject: Triangle VCO help please
> Date: Sun, 26 Nov 2000 01:17:59 +0100
>
> > Hello,
>
> Hi,
>
> > I have built a triangle VCO based on the Buchla 258 and the Electronotes
> > Option 2 Triangle VCO. I have a small problem.
> > http://www.simple-answer.com/258mod.jpg
>
> Ah, haven't seen that before...
>
> > The waveforms looks  right at all the locations in the circuit (as the
> > buchla design) however insted of being +/- 2 volts at the point
> > indicated, mine is just under +/- 200 mVolts.
> >
> > Where in a triangle oscillator does that gain come from? Is that because
> > of the 3080? The Electronotes one used a 3080 and the Triangle output is
> > right off of it so I know that one has a bigger voltage. I have been
> > trying all kinds of things with no luck.
> >
> > can anyone help me? All the waveshaping after that point depends on this
> > level being higher.
>
> Try to fool around with the R29/R30 divider. It forms the feedback
> path through Q7, Q8 and Q9.
>
> Cheers,
> Magnus

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mark verbos

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