[dorkbotpdx-blabber] Stepper motors and/or dot matrix printers
jboone at earfeast.com
Mon Oct 31 13:07:42 EDT 2011
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.
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