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I have seen a similar problem solved using a RC circuit to control a relay.
Off Delay Relayhttp://www.grainger.com/Grainger/DAYTON-Time-Delay-Relay-5WML9?Pid=search
You want a power trigger, interval on, relay. These are made, but they can be $50, or even $200, and may be specced for 24V or even AC mains power.What's wrong with the relay I linked to from Digi-Key?If you prefer Amazon, this item is $13.40 with Prime shipping available, and seems like it might work (although the specs are not 100% clear): http://www.amazon.com/gp/product/B0009WP09K/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0009WP09K&linkCode=as2&tag=enchage-20This one will definitely work (12V coil, contacts rated for higher than that both AC and DC,) given the data sheet (note that it's DP/DT, so it can both close and delay to open, and open and delay to close): http://rcm-na.amazon-adsystem.com/e/cm?lt1=_blank&bc1=000000&IS2=1&bg1=FFFFFF&fc1=000000&lc1=0000FF&t=enchage-20&o=1&p=8&l=as4&m=amazon&f=ifr&ref=ss_til&asins=B0078RYKJA$67, plus shipping, no Prime (and most vendors charge twice that for the same item, so buyer beware and all that)Data sheet: www.serelays.com/library/section5/105A_TDRSRX_TDRSOX.pdf