Smoke alarm buzzer!The ones inside these things are really loud and a wimpy 9vdc seem to have enough current to drive them.http://ecx.images-amazon.com/images/I/41vOLU-588L._SL500_AA300_.jpgLefty
I would add a series resistor from D8 to the gate to protect against gate capacitance charge/discharge.
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via Egeo 16