[sdiy] Crumar DS-2 Issues....

[harrybissell]

I place my bets on an open ground or reference voltage common to the
low side of all the pots.

H^) harry

Bob Weigel wrote:

> I'm still waiting for schematics from a member to solve an issue with my
> DS-1's glide that doesn't work.  That...sounds like it would be a
> calibration issue possibly though.  Generally on synths with digital
> control stuff going on, knobs are read by digital scanning/conversion.
> I'm not sure how it is set up on these.  Hope to get those some day
> soon.  I used my DS-1 the other night at a gig.  They are just a cool
> keyboard.  What a great sounding mono synth. I'll post information on my
> page
>
> cu.imt.net/~sounddoctorin
>
> in the global synth section as always when I get a chance to do a
> technical survey of the circuit and at that time you might want to ask
> again if you haven't gotten an answer yet. -Bob
>
> SealsCrofts 1 9 7 5 wrote:
>
> >Hi all
> >
> >My friend has a 1978 Crumar DS-2. There is one
> >specific problem Id like to address. It has to do
> >with the potentiometers. It's crazy, but they aren't
> >linear. They wont do anything until they are set at
> >about "9" (out of 10). If the knob is set anywhere
> >from 1-8, nothing will happened. The entire values of
> >1-10 are crammed the space of 9-10, making it very
> >sensitive to adjust things. This problem seems to
> >happen with the LFO knobs, and a few others.
> >
> >It's kind of a tricky problem to explain, but I
> >wondered if anyone else noticed this with the DS-2?
> >Would a simple callibration fix the problem? I dont
> >have the schematics, but I can probably find them.
> >
> >thanks,
> >jonn
> >
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