Korg Poly800/EX800 Users

> Zoinky is right that we need to use linear pots. What are all of the
> markings on your pot's? When you move the pots through their full
> rotation, does the voltage move smoothly or does it move slowly and
> then at each end, suddenly jump up or down?

The pots I have are new 10K linear pots and they indeed look/feel
linear when I measure them on my voltmeter.  I think all they say is
"10K B" somewhere but I don't have them in front of me right now.

When I sent 0 to 5V through the pitch bend (1-5B).  The pitch bend
went from down a fifth to normal at 12 o'clock, but did nothing for
the rest of the range.  This happened with +5 connected, the wiper
connected to 1-5B, and either ground or -5V to the other side.  And it
did feel "smooth/linear" from far left to 12 o'clock.

What is the range (in musical terms) of the joystick?

Thanks for your help you guys.

-Tim


--- In korgpolyex@yahoogroups.com, "Gordon J. C. Pearce MM3YEQ"
<gordon@...> wrote:
>
> On Wed, 2009-02-18 at 05:40 -0800, Michael Hawkins wrote:
> > Tim,
> > 
> > I recommend you wait until we have a bit more discussion about the
> > operation of the joystick board.
> > 
> > I wouldn't want to see you blow your Poly up.
> > 
> > I am quite busy today, but will attempt to provide some additional
> > instructions tomorrow.
> > 
> > Zoinky is right that we need to use linear pots. What are all of the
> > markings on your pot's? When you move the pots through their full
> > rotation, does the voltage move smoothly or does it move slowly and
> > then at each end, suddenly jump up or down?
> 
> The pots are a bit funny, with a kind of centre-tap on them.
> 
> As far as the output from the joystick board goes, there are two
> connectors - CN1B and CN8B.  CN8B goes to the bend range slider, CN1B
> goes to CN1A on the main board.  CN1A is as follows:
> 1 - +5v
> 2 - 0v
> 3 - -5v
> 4 - X output
> 5 - Y output
> 
> The X and Y outputs are centred around 2v, and go from 0v fully right or
> up to 4v fully left or down.
> 
> I haven't drawn out the circuit on the joystick PCB yet, but I suspect
> it's some sort of voltage regulator and biasing thing.
> 
> Have a look at the circuit below for an idea of what might work.
> 
> http://www.gjcp.net/synth/joystick.jpg
> 
> Gordon
>