Re: Getting Parallel port to run relay

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
wrote:

> A fuse, (assuming that it was fast and sensitive enough to blow

before the

> transistor or p-port output were damaged),

ALL the worry about damage to the port goes away when you use an opto
isolator. Almost as simple as an LED, but offers full isolation to
the port. Buy a second in case you burn up the first. another 37
cents should not break anybodies bank.


Dave