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I want to build something that beeps loudly when there is a powercut.

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Thread replies: 29
Thread images: 3

I want to build something that beeps loudly when there is a powercut. The simplest design possible. I'm thinking some kind of capacitor connected to a siren that activates when the power drops. How would I go about making it?
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12v battery charger, 12v battery, 12 volt siren, 12v relay. Wire relay so that when the power is on from the charger, it is energized, and the siren is off. Soon as power cuts off, relay fails closed and completes circuit from battery to siren. Done.
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>>1240285
/thread
That is exactly what I was going to post.
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>>1240293
/thread
That is exactly what I was going to post.
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>>1240295
/thread
That is exactly what I was going to post
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>>1240304
/thread
That is exactly what I was going to post
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i drew this for a guy that wanted battery backup for his aquarium pump. you can use the same principle. replace pump with buzzer. if you want just a quick scream instead of a continuous scream, put a big cap in series with the buzzer, like 5000uF.
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>>1240281
Are you trying to monitor your refrigerator but your roommate keeps cutting the power to the router?
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>>1240360
h-h-how did you know? Nate is that you? Holy fuck. I'm going to fuck you up. All you had to do was not eat the eggs.
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>>1240308
/thread
That is exactly what I was going to post
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>>1240360
/thread
That is exactly what I was going to post
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>>1240360
Lmao
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>>1240333
>12V pump
=
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>>1240465
/Thread
That is exactly what I was going to post
Except for it needs a shot of black.
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>>1240281

It would be easier to wire something that beeps loudly when it has power, and doesn't beep when it has no power.
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>>1240285
/thread
That is exactly what I was going to post.
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>>1240293
>>1240295
>>1240304
>>1240308
>>1240376
>>1240465
>>1240527
>>1240564
/bread
That is exactly what I was going to toast
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we do it in schools, in Russia,i can send you a pic,but not sure you will have russia electro details, my advice, just use a sound generator and add some transistors
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>>1240569
qt Russian grils?
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>>1240570
i don't understand
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>>1240570
>>1240569
>>1240281
so, this is a scheme,left down - a wire that can be cut, right down a powerline(battery)
,right up to
loudspeaker
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>>1240564
/thread that was exactly what I was going to post
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>>1240285
>/thread
>That is exactly what I was going to post
>>1240293
>>1240295
>>1240304
>>1240308
>>1240465
>>1240527
>>1240564
>>1240566
>>1240599

/thread
That is exactly what I was going to post
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>>1240660
/Thread
Thy is exactly what I was going to post.
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>>1240613
>>1240622
>>1240660
came here to post these...
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>>1240670
/Thread
That is exactly what I was going to post.
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>>1240293
/thread
That is exactly what I was going to post
Thread posts: 29
Thread images: 3


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