Never mind my last post. The output would only swing from +10 to 0 volts,
and bipolar would probably be more useful. See the attached image for a
quick and easy schematic. The opamp type is not critical.
Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@... > -----Original Message-----
> From: Dave Bradley [mailto:daveb@...]
> Sent: Wednesday, April 12, 2000 3:27 PM
> To: motm@egroups.com
> Subject: RE: [motm] Power Supply and Joystick advice
>
>
> There are a zillion resistor value pairs that you could use. The important
> factor to get a specific voltage is the ratio between the two resistors.
> Blah blah insert a bunch of irrelevant theory here....
>
> Bottom line:
>
> Connect a 10K resistor to ground, and a 5.1K resistor to +15V of your MOTM
> supply. Connect the free ends of the 2 resistors together, you'll
> get about
> 10V there. That's without trying to drive much of a load. To make the
> circuit stable, connect the resistor junction to a voltage follower, which
> is just any old opamp's positive input, with the negative input connected
> directly to the output. Then the output of the opamp connects to one
> joystick pot leg, the other pot leg goes to ground, and the pot
> wiper is the
> joystick output.
>
> Dave Bradley
> Principal Software Engineer
> Engineering Animation, Inc.
> daveb@...
>
> > -----Original Message-----
> > From: thomas white [mailto:djthomaswhite@...]
> > Sent: Wednesday, April 12, 2000 1:50 PM
> > To: motm@egroups.com
> > Subject: Re: [motm] Power Supply and Joystick advice
> >
> >
> > Thanks JB,
> >
> > I just want to get a rounded opinion on the max voltage I should
> > use. I am
> > pretty new to figuring out resistance since I come from a purely
> > "A into B"
> > kit background (Duh). So what values in the voltage divider would
> > I need to
> > scale down to 10v? Thanks,
> >
> > Thomas White
> >
> > >From: jwbarlow@...
> > >Reply-To: motm@egroups.com
> > >To: motm@egroups.com
> > >Subject: Re: [motm] Power Supply and Joystick advice
> > >Date: Wed, 12 Apr 2000 14:33:02 EDT
> > >
> > >
> > >In a message dated 4/12/2000 9:44:23 AM,
> > djthomaswhite@... writes:
> > >
> > > >On the joystick level, I am looking for the best way to drop
> > the +15/-15v
> > > >volts from the 900 PSU to +10/-10v or +5/-5v for joystick use. Which
> > >voltage
> > > >do you guys recommend?
> > >
> > >Doesn't the Klein schematic show something about a lower voltage
> > (like 10V
> > >maybe)? I say split the difference with a voltage divider (didn't I put
> > >something about this in there too)? Take one 100K resistor and
> > put one side
> > >at 15V and on the other side place 1) a second 100K resistor, and 2) an
> > >OUTPUT. Connect the other side of the second 100K resistor to
> ground. The
> > >OUTPUT should be about 7.5V. I know I put some stuff about scaling and
> > >offsets in there, take a look at that too.
> > >
> > >I hope someone smarter than me will chime in and correct any
> > errors I may
> > >be
> > >spreading -- but it should be OK for a FracRack!
> > >JB
> >
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