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As far as a timer goes, just buy a $1 digital egg timer from the dollar store (I bought a couple of them, 1sec to 99mins, from Dollarama for airsoft......... gonna make pretend satchel charges for a Search & Destroy game I'm planning) and modify them for what you need. I'm not going to make anything that blows up or anything, but I'd like them louder so I'll use a transistor as a switch (attached to the buzzer) to toggle in power to a louder buzzer or airhorn or something that wil be contained in the satchel itself.
Is a thought for you anyways.
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