Re: Stepper controllers

Thansk Dave,

Do you mean that your diodes are in series with the wires to the motors?
The circuit I am using has diodes from each motor wire to ground but it
would seem safer to put some in the motor wires as well. The only worry
I would have is the breakdown voltage of the diodes - as I understand
it, the voltage spikes produced by such motors can be many times the
operating voltage so I'm not sure how I should choose the diodes working
voltage to be on the safe side.

Ian

DRigotti@... wrote:

>
> From: DRigotti@...
>
> Ian,
> I do not use opto-isolators on my controller boards. I DO use
> blocking diodes between the driver IC and the stepper motor coils. I use 35V
> max at 1.5A. This may not be "powerful" enough to bypass the diodes to
> destroy a motherboard. I have never had a problem....
> Dave
>
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Best wishes

Ian

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