[dorkbotpdx-blabber] Stepper motors and/or dot matrix printers

[Doug Ausmus]

<LOL!> Cool... er... Hot!

On Mon, Oct 31, 2011 at 10:07 AM, Jared Boone <jboone at earfeast.com> wrote:

> On Oct 31, 2011, at 9:57 AM, Doug Ausmus wrote:
>
> And just for fun, for those who recall our incandescent light bulb
> discussion last meeting, you can use an incandescent bulb instead of or in
> combination with a power resistor if everything is very carefully
> selected... And this could offer a benefit of reduced current drive when in
> hold-mode since when the filament glows brighter, the resistance increases,
> further limiting the current to below max for the stepper: an automatic
> variable power resistor! Again, it takes a bit of work to select a bulb to
> accomplish all this in a way that matches the stepper characteristics, but
> sometimes a right combination can be found. Hmmm... do I detect a
> steam-punk stepper driver design coming? Might be kind of cool...
>
>
> And to completely hijack the conversation, Bose (and other speaker
> manufacturers, apparently) have used this positive temperature coefficient
> (PTC) lightbulb trait in their speakers to claim they are impossible to
> burn out.
>
> - Jared
>
>
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