So it can trigger at 80 ohm,
It depends so much on your alarm you really need to take it apart and look around in side to see where the awful sound of the alarm comes from and see if you can use that signal to trigger your electronics.PLEASE take care of the clock is mains powered.
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Its a pressure sensor so I guess you can't. HOWEVER the digital alarm should/must have an output to drive the alarm noise , you should be able to pick that up - Geee I hope your not making a bomb timer!!!
hahahahahah i am certainly nok making a bomb timer, but it is a school project :) If could get a littel bit more details, than it could be a great help! :D