im pretty sure the 7805 5V regulator would work for ya, to provide a 5V
logic supply from the 24V supply, they should only be a dollar or 2 at
radioshack. then you could eliminate the atx supply. I would also stick in
a wire to ground to the chassis of the pc. i'd be afraid of the port sinking
a decent amount of current and frying out. even a wire from the parport
plug to a ring terminal on one of the case screws in the back should do the
trick.
On 10/11/07, Sebastian Kuzminsky <[EMAIL PROTECTED]> wrote:
>
> Chris Radek <[EMAIL PROTECTED]> wrote:
> > I think my linearity is much better than you describe. Maybe try
> > pure pwm mode (not pdm)? Or it may just be a matter of your low
> > power supply. I'm using 24V on mine.
>
> I picked up a new power supply (24 VDC, 3.6 A), but I couldnt get my
> setup to work with it.
>
>
> The old setup that does work:
>
> PC on its own internal ATX power supply.
>
> PC parallel port connected to L298 driver circuit.
>
> Driver logic powered by a stand-alone ATX power supply.
>
> Driver ground tied to PC ground via parallel port ground lines.
>
> Driver gets motor power from the stand-alone ATX +12V.
>
>
> What I tried was this:
>
> Tied the new PS ground to the rest of the system ground on the driver
> circuit board.
>
> Unplugged the stand-alone ATX 12V from the L298 motor supply input.
>
> Plugged the 24V from the new PS to the L298 motor supply input.
>
>
> When I plugged this in, the stand-alone ATX power supply would shut down.
> Sketchy! Disconnecting the 24V supply and powercycling the stand-alone
> ATX PS would bring it back. The PC stayed up through all this and
> seemed unaffected.
>
>
> My theory is that the new 24V PS ground was sinking current that the
> stand-alone ATX was sourcing, tripping some sort of GFCI protection in
> the stand-alone ATX power supply, causing it to temporarily shut down.
>
>
> So now my plan is to get rid of the stand-alone ATX power supply entirely,
> and substitute a little 5VDC, 500+ mA wall-wart transformer for the
> driver logic power supply. Seem reasonable?
>
>
> What power architecture are other people using?
>
> Do you worry about ground loops?
>
> Motor noise in the logic supply?
>
> Is optical isolation between the PC and the servo drivers common?
>
>
> --
> Sebastian Kuzminsky
>
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