[PD] stepper control

Andy Farnell padawan12 at obiwannabe.co.uk
Sun Aug 14 19:34:02 CEST 2016


On Sun, Aug 14, 2016 at 08:16:52AM +0000, Lucas Cordiviola wrote:

> Also please be careful and be aware that there is risk of 
> damaging things.
> 
> Consider this a risk to the amp, do it with a low power one, 
> probably with one of those inside little usb speakers.

Any inductive load will give a back EMF on the negative going edge
of the pulse. Look at stepper motor driver circuits and you will
see that protection diodes are used. Push-pull audio amps aren't
really designed for this kind of punishment, they are linear, 
whereas stepper drivers are designed to switch a clean pulse.
That said, for small motors you will get limited success, so its
a useful hack to know.

Andy
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