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Horns, Bells, Megaphones, Sirens etc.
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Birdie Doorbell Ringer
http://www.uoguelph.ca/~antoon/circ/birdie.htm
Very loud beeper
http://www.discovercircuits.com/PDF-FILES/beeper3.pdf
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http://www.uoguelph.ca/~antoon/circ/birdie.htm
http://www.discovercircuits.com/PDF-FILES/beeper3.pdf