Re: [CAD_CAM_EDM_DRO] Getting Parallel port to run relay

On Friday 28 January 2005 03:01 pm, Alan Marconett wrote:

> Hi Bert, Andy, list,
>
> After thinking about it, I wonder if simply connecting a parallel port
> output pin to a relay coil would damage it.

If you didn't have a diode across the coil, then yes, it probably would. In
any case I think the amount of current necessary to drive a relay coil would
be excessive in terms of what a parallel port can put out -- they're made to
drive logic, not much else.