At 08:41 PM 12/16/2009, Rocket J Squirrel wrote... >I'll second Richard's call for audible alarm. Here's a schematic: http://www.flatsurface.com/pics/buzzer.jpg Could be easily built on a piece of perf-board. Radio Shack parts: Buzzer 273-066 $5.49 http://www.radioshack.com/product/index.jsp?productId=2062399 2n2904 transistors 276-2016 $0.79 http://www.radioshack.com/product/index.jsp?productId=2062609 1n4148 diodes 276-1620 $2.59/50 http://www.radioshack.com/product/index.jsp?productId=2062587 3.3K ohm resistors 271-1328 $0.99/5 http://www.radioshack.com/product/index.jsp?productId=2062345 Perf board 276-148 $1.99/2 http://www.radioshack.com/product/index.jsp?productId=2104052 |
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