On 25/05/2010 1:07 PM, Mike Raiford wrote:
> It's more about the relay's coil being an inductor. Once the IC
> switches, it will send a high voltage pulse back through the IC, frying
> it nicely. There are ways to get around that, but I'll leave that as an
> exercise to the reader to figure that out.

As Scott said, if you knew more about electronics then you would know 
that a back emf diode is an integral part of these circuits and relays 
used in process control come with the diodes fitted.

-- 

Best Regards,
	Stephen

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