CAD CAM EDM DRO - Yahoo Group Archive

Dumb question on TTL control of a relay from parallel port

Posted by washcomp
on 2003-09-09 06:23:57 UTC
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

Discussion Thread

washcomp 2003-09-09 06:23:57 UTC Dumb question on TTL control of a relay from parallel port Antonius J.M. Groothuizen 2003-09-09 07:23:43 UTC Re: Dumb question on TTL control of a relay from parallel port Jeff Goldberg 2003-09-09 12:16:19 UTC RE: [CAD_CAM_EDM_DRO] Re: Dumb question on TTL control of a relay from parallel port