Re: Help me solve this design problem PLEEEZ

You did not tell us who or what turns on the relay and turns it
off. If controlled by a microcontroller, then it could easily be
programmed to count down to zero. If it is the operator that
performs this function then the timing would not be precise.

Having said that, you could use a timer circuit (555) that is
started by the action of the relay switch and times out after 5
minutes. It will then drive the alarm if not reset by the action of
the relay switch (Operator).

Hope that this helps.

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