Night buzzer 2010-07-06

[zachtheterrible]

zachtheterrible submitted a new article:

Night Buzzer - If you want revenge that won’t kill someone, just make them go insane, have I got the thing for y

If you want revenge that won’t kill someone, just make them go insane, have I got the thing for you!! I whipped this device up over the last couple of days and couldnt be more satisfied.

Place this in a room where somebody sleeps. While the light is on, this circuit will not make a peep. When the light turns off though, the circuit will stay quiet for about 10 seconds (determined by the 1000uf cap and the 22k resistor) and then turn on. When they hear it, they will get up and turn on the...

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[ben7]

Great circuit! Quick question though, why is the buzzer rated for 3-16vdc when the power supply it is running off of is at 1.5v?