RE: [CAD_CAM_EDM_DRO] Re: Dumb question on TTL control of a relay from parallel port

Thanks for the prompt advice. I came across a site (in Australia) which
offers the following board fully assembled for $47US delivered to the
States. I'm planning on using the interface with MACH1/2 and I assume the
outputs would be compatible. Please let me know if the circuit makes sense
and maybe I'll build a three relay version (all I really need). It might
cost almost the same by the time I get done buying the stuff from Digikey
and practicing my almost non-existent soldering skills on it.

http://www.kitsrus.com/pdf/k74.pdf

Thanks and regards,
Jeff

-----Original Message-----
From: Antonius J.M. Groothuizen [mailto:agroot@...]
Sent: Tuesday, September 09, 2003 10:23 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Dumb question on TTL control of a relay from
parallel port


You can use a transistor and clamping diode, or if you need multiple
outputs with this capability you can take a look at the ULN2003.

Parallax shows how to use the ULN2003 in the documentation available
on their website.

Tony

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp" <jeff@w...> wrote:
> I've got a parallel breakout board giving opto-isolated TTL level 5
> volts. I'd like to control a relay for my mist coolant. I can get
a
> 5 volt relay (typical coil current 30-60 ma), but I seem to
remember
> that TTL level isn't designed for the required current (?).
>
> If the above current is too high, is it best to try to find a
> miniature reed relay to control the coil of the "power relay" or is
> there a better way?
>
> Clueless in New York,
> Jeff


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