ELECTRONICS: FUN AND FUNDAMENTALS
By Charles Platt, author of Make: Electronics
Anti Dog-Bite Siren
Hack an alarm siren to make a DIY dog repeller.
THIS TIME, INSTEAD OF BUILDING something new, I’m going to modify an existing product. I want you to see how quick and easy a mod can be, if you have just a little electronics knowledge.
The product I’m interested in is an alarm siren. This suggests something you’d find on an emergency vehicle, but in the world of burglar alarms, a siren is a little gadget that usually makes a high-pitched squealing sound at 2kHz or above (2,000 cycles per second).
My goal was to adjust the siren to an even higher ...
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