[sdiy] My Joystick Design

[harry]

Re: #2 below...

simulation in Electronics Workbench does not guarantee success or
failure,
either way. Some simulations will fail and then work in real life...some
will
simulate fine then work in real life.

Usually (for me) a rule of thumb is that if I get a LOT of convergence
errors and
have to turn the time steps WAY down.... the design is probably a little
iffy.

Simulating mixed analog and digital circuits does not work well at all.
If I must,
I draw models of the digital gates as analog circuits and then simulate.
THAT is
a real pain in the @ss...

If you do anthing weird... be sure to check out currents as well... I
once had a dual
clamping circuit that ran several hundred amps (in a 741) at zero cross.
Funny...
the monitor screen didn't even get hot  ;^P

H^) harry

"Rhen, Kris" wrote:

>
>
> I should add that
> a) One constraint is that the offset is not attenuated by the joystick
> (thus it is in a following stage), and its range is +-5v (thus the
> resistor values) - though I may make it more.
>
> b) This simulates in ElectronicsWorkbench and performs exactly as I
> want it - but does that really mean anything? :-)
> c) Any way to reduce the number of amps?
> Thanks again all!
> KRIS
>
> -----Original Message-----
> Ok, please no laughs.  I'm still a bouncing baby newbie, but I bought
> some of those MECI joysticks and want to make some controllers out of
> them.  The first one's schemo is here
>
> http://www.stucki.com/krhen/downloads/joystick.gif
> <http://www.stucki.com/krhen/downloads/joystick.gif>
>
> (one axis only shown) Its fairly simple.  Takes either a constant
> voltage (from the +15v source) or some input switched at the jack, so
> it
> either functions as an attenuator or a pure CV source.  The input is
> ranged, then the joystick moves from 0 to the range.  Then, there's an
>
> offset pot that takes it +- about 5v.  Both axes are the same.  Any
> comments/suggestions/optimizations?  I'm particularly not sure on the
> input/output impedance thing.
>
> The other design is the same but the joystick acts as a reversible
> attenuator (I'll show that one later). Thanks all
> KRIS

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