Hi Marc,

You should be able to find a piezo buzzer alarm for a couple bucks at
Radio Shack. They require very low amperage (~10-20mA) so you wouldn't
even need a relay. You can find them with sound output over 100 db.
which will wake the dead. A quick google search yields these examples:

http://www.buzzersdirect.com/Product...ProductID=2057
http://www.radioshack.com/entry.jsp?...&entry=2062404

Under $10, too!

Jason



Marc Heusser wrote:
My GPS has a nice featu anchor watch, including an alarm output (also
for other alarms) to drive a relay (0.5 A maximum).

What do you connect that will wake you under all circumstances?

TIA

Marc