For you EE types, I have a question.   I am installing a smoke system and wanted to use a relay to control the pump.  I bought this relay from Mouser that I thought would do the trick:

http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMtLEhJ5P%2fNsZ6bnrz6%2f%252b%252bJvA50eSiydqPQ%3d

The problem is that if there is any load (like the pump or even the 0.02A indicator LED I installed, then the relay will not turn off when I turn off the signal voltage.  So either I do not understand how to use the relay, or I chose the wrong relay.  I have checked my wiring in-so-much as to confirm that the signal voltage does turn on and off with the switch, voltage across the 'LOAD" terminals does disappear when there is no load but not when there is a load (current). 

Is it possibly because this relay is designed for an AC load?  Other suggestions?

--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net