Re: [CAD_CAM_EDM_DRO] Re: stepper problem

andrewyslee wrote:

>
> Ah!!! looks that there's still plenty learning to do!!!
>
> The old geeeezer found the problem. Amazing what a USD10 multimeter
> can do!!! The +5V cable insulation had not been trimmed off leaving
> the connection open. Trimming the insulation off got the motors
> humming along beautifully. But it means that leave us to puzzle over
> how without the +5V the Geckos can produce 1 way motion (plus "soft
> tingling noise") in the first place???

Capacitive coupling, I guess. There was enough capacitance so that very short
pulses, maybe under 100 nS could make it through the opto-LEDs until the other
side charged up.

Jon