Fire Alarm Bell Alarm Clock – Worlds loudest alarm clock?

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Overview

Ever sleep-in because your alarm clock wasn’t loud enough? With this design that is guaranteed not to happen! This hack takes a standard cheap alarm clock, some interface components and a fire alarm bell to get the job done right. Normally these small alarm clocks use a piezo buzzer to attempt to wake you up. The alarm signal is hijacked from the clock circuit board and used as an input to the interface board.


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Have a look at these pages to see how it was built.

Parts needed and interface board schematic. (page 2)

Take apart the clock, see how it works. (page 3)

Take apart the bell. (page 4)

Mod the clock to have an alarm output. (page 5)

Build and install the interface board. (page 6)

Put it all back together. (page 7)

Completed project! (page 8 )



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67 Comments


  1. whhhooooha, hightech mod


  2. uhm..the sound is quite weak for a fire alarm bell.. (if i heard it right) what if you
    let the transistor drive a relay instead? that way the transistor would not be loaded that much
    by the current drawn by the bell and would also let the bell have much more current driven into
    it and results to a much fuller ring… =D


  3. @sid: it sais in the description on page 4: “Fire alarm bells are 24VDC, the power supply being used is a 9 VDC supply which worked fine.”


  4. @von : woops.. my bad! heheeh.. i was not able to read that part..
    anyways, if ever the person who wanna make of this and use a higher power bell,
    i think its better to use a transistor driven relay.. ^^


  5. Hi Sid and Yon,

    The bell would sound a bit louder running on 24 volts but 9 volts does quite good. The bell only pulls 35mA, so the transistor isn’t breaking a sweat running it and the LED. :)I think the camera must have some sort of noise leveling built in since it sounds louder in real life than in the video. If I upgrade to an air horn I will need the relay though. 😉


  6. whoa.. air horn.. you really dont want to wake up dont you? heheheeh… ^^,
    anyways, this is a nice project.. ill try to make one in my free time ^^,



  8. Nice build and a really great project idea.
    The paint job seems over the top but hey, it looks great, and its one hell of a finished project. I ought to make myself one.


  9. Hi Tony,

    Glad you liked it. Actually the clock was red, didn’t have to paint a thing. 🙂


















  27. That alarm would work better, and be more reliable if you wire in a beefier transistor, like a 1 amp Darlington, as well as a higher voltage DC supply in the circuit.


  28. that’s exactly what my teenage son needs! however, the project looks a little beyond our skill / ability level. any way you’d consider selling one??? if so quantos? what if i got you the parts as well? long shot i know, but had to ask! thanks!


  30. Hello,I’m from German and I saw your clip,but I cant understand you !Why you don’t say that in the clip? hehe! Do you understand me? I think you don’t understand me, because I’m only in the 6th class in German !°;°


  33. WARNING: above link is link to virus


  35. pls can anyone tell me ow to design an alarm clock module using an electronic workbench support system?


  37. Ah, its the same electronics workbench. u know the kind from multisim. its a design tool that provides one with all the components to create board level design on one’s pc.
    Actually, its a software that allows one to draw circuit diagrams of components as one would do in the real sense of the word. its advantage is that instead of making use of real components for the circuit diagram one uses components which can be found on the software’s interface. Also, at the end of the drawing of the circuit diagram, there is chance for one to put on the power switch and activate the circuit to see if it will work.(more like simulation). I hope u get it?


  39. thanks 4 writing back. i really appreciate it


  40. but my project specifically involves using an electronics workbench, Alan Parekh.


  41. Hi Shollar,

    What I was meaning is that you could “construct” that circuit within the software to make a simple clock. You would have to check to see if you have all of the components available in the simulation software.


  42. thanks Alan, but the problem now is that i dont know how to use the software besides i dont have the sooftware


  43. Hi Shollar,

    Unfortunately I can’t help you there… I also have never used the software.


  44. Oh-Oh, Now I’m in deep trouble. The project is due for submission Dec 2nd.


  45. Hi Shollar,

    What are they expecting you to create this simulation on if they don’t provide you with the software?
    Was your initial enquiry about electronic workbench because that is what they recommended?
    What are other people using for software?


  46. Hi Alan,
    Other people are using the same electronic workbench. But now i think i’ll concentrate on finding the circuit
    diagram of a particular alarm clock module be it burglar alarm, fire, smoke, heat, pressure, temperature, car alarm
    or whatsoever. After getting the circuit diagram i’ll simulate it on the software.



  48. Hi Alan,

    I was wondering if you could make me one of those fire alarm alarm clocks? How much would it cost? Can you please get back to me by my email its timothy_20062001@yahoo.com. I’m very interested in one of them alarm clocks.

    Tim


  49. Hi Tim,

    Unfortunately at this time you would need to make it yourself.





  53. We respectfully believe that our alarm clock is louder, when you hook your computer up to your stereo speakers and then blast the volume all the way up. Anyone care to perform a comparison test?






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