Hacked Gadgets Forum

January 11, 2008

Fire Alarm Bell Alarm Clock – Worlds loudest alarm clock?

at 5:12 pm. Filed under Computer Hacks, Crazy Hacks, DIY Hacks, Electronic Hacks, Funny Hacks, Insane Equipment, What Were They Thinking

Take apart the Clock, see how it works

Taking the clock apart was very simple, a few screws allowed the plastic outer shell to be removed. The actual clock module us held together with some plastic clips. A small flat blade screwdriver makes quick work of them. Be careful when opening the clock module though since the top plastic is used as pivot points for many of the gears that will want to fall out as soon as it is opened and tilted. .

I am not very impressed with the solder job, the oscillator is in desperate need of a bit more solder.

The alarm function is activated mechanically by the clock and closes a physical switch. In the below picture have a look at the contact (it is open in the picture) just above the small green circuit board. When this closes the top negative pole is transfered to the tiny controller via the bottom pad.

The On Off switch is mechanical and slides up and down.

Funny how letter O, upside down it looks like a C. I wonder if they ran out of the correct letter and the C looked close enough…

When the alarm switch is activated this physical tab wedges itself into the alarm contact preventing it from activating.

Closer look at the alarm contact.

The black blob on the circuit board covers the clock controller.

Measuring from the top of the alarm switch to the positive of the battery.

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Below reviews, comments by and a of 7 cialis . May 2014 of dysfunction its sold men a...


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66 Responses to “Fire Alarm Bell Alarm Clock – Worlds loudest alarm clock?”

  1. isnotrequired Says:

    whhhooooha, hightech mod

  2. sid Says:

    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. yon Says:

    @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. sid Says:

    @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. Alan Parekh Says:

    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. sid Says:

    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 ^^,

  7. Photo Studio Lighting on the Cheap - Hacked Gadgets - DIY Tech Blog Says:

    […] by me who is on the steep learning curve of photography. I took lots of macro pictures for the Fire Alarm Alarm Clock project. Some pictures turned out good, and some I could never get to look good no matter what I tried. I […]

  8. Tony Nunn Says:

    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. Alan Parekh Says:

    Hi Tony,

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

  10. Fire Alarm Bell Alarm Clock Will Wake You Up | Laughing Squid Says:

    […] trouble waking up in the morning? Alan Parekh of Hacked Gadgets has a solution, make your own Fire Alarm Bell Alarm Clock. Ever sleep-in because your alarm clock wasn’t loud enough? With this design that is guaranteed […]

  11. Deadly Computer Blog » Blog Archive » This is sure to wake you up Says:

    […] Alan over at Hacked Gadgets has hacked together an alarm clock, to a fire alarm bell, with the purpose of being better to wake you up in the morning. Alan, that is a very loud alarm, and I’m sure the rest of the people who live in your house/apartment/neighborhood are awake too, hopefully you don’t get up too early! Share and Enjoy: These icons link to social bookmarking sites where readers can share and discover new web pages. […]

  12. DIY HACK - HOWTO build a "Fire Alarm" Alarm Clock | zedomax.com - a blog about DIYs, hacks(wii hacks, iphone hacks), and satiric opinions on gadgets and technology today. Says:

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  13. DIY Fire Alarm Clock - loud, loud, and red, red.. - The Red Ferret Journal Says:

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  14. Fire alarm bell repurposed for waking the dead | Gadget & Technology News Says:

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    […] Read | Permalink | Email this | Comments […]

  17. Fire alarm bell alarm clock Says:

    […] I could use one of these to wake me up in the morning! Alan at Hacked Gadgets made a nice tutorial video on how to hack a cheap alarm clock to ring a fire alarm bell, don’t-cha-know. – [via Link. […]

  18. Feueralarm-Wecker | Bauanleitungen.NET Says:

    […] Wer schonmal den Wecker überhört und weitergeschlafen hat empfehle ich den Feueralarm-Hack auf hackedgadgets.com. Auf der englischsprachigen Seite wird ganz genau gezeigt, wie man einen einfachen Wecker mit einer grosse Feueralarmglocke verbindet. http://hackedgadgets.com/2008/01/11/fire-alarm-bell-alarm-clock-worlds-loudest-alarm-clock/ […]

  19. Mein persönlicher Rekord - StyleSpion Says:

    […] dieser Fire Alarm Bell Alarm Clock – der Name! – wäre es wahrscheinlich nicht so weit […]

  20. Jeriko Says:

    So… how do you turn it off?

  21. Fire Alarm Bell Alarm Clock | Dabbler.ca | Something for Everyone Says:

    […] through the alarm clock? Well fret not my sleepy friend, Dabbler has the perfect solution for you: The Fire Alarm Bell Alarm Clock (a.k.a. “The Loudest Alarm Clock in the World”). The guys over at HackedGadgets.com […]

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    […] trouble getting up in the dawn – here’s something that might help nudge you out of bed. The DIY Fire Alarm Clock is a combination of a common alarm clock complete with some interface components as well as a fire […]

  24. Zygos Community Links Says:

    Fire alarm bell repurposed for waking the dead…

    Filed under: Household…

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  27. geoff R. Says:

    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. scott m Says:

    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!

  29. Alan Parekh Says:

    Hi Scott,

    Thanks for asking, but I am keeping it. Sorry.

  30. Davoriusan dongeon Says:

    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 !°;°

  31. Davor Gabler Says:

    Ey,I am ,,Davoriusan Dungeon ´´ from German !

  32. Davor Gabler Says:

    Oh,I diss you !

  33. yonsje Says:

    WARNING: above link is link to virus

  34. Alan Parekh Says:

    Thanks Yonsje,

    The Comment has been deleted.

  35. shollar Says:

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

  36. Alan Parekh Says:

    Hi Shollar,

    What is a workbench support system?

  37. shollar Says:

    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?

  38. Alan Parekh Says:

    Hi Shollar,

    You sure can make a clock with that. Do it using emulated TTL.
    http://www.ttlclock.com

    This PDF includes the system schematic.
    http://www.ttlclock.com/index_files/ttl_manual.pdf

  39. shollar Says:

    thanks 4 writing back. i really appreciate it

  40. shollar Says:

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

  41. Alan Parekh Says:

    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. shollar Says:

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

  43. Alan Parekh Says:

    Hi Shollar,

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

  44. shollar Says:

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

  45. Alan Parekh Says:

    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. shollar Says:

    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.

  47. Indestructible Binary Alarm Clock - Hacked Gadgets - DIY Tech Blog Says:

    […] my fire alarm bell alarm clock clashes with your industrial decor have a look at this Indestructible Binary Alarm Clock. This […]

  48. Timothy Says:

    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. Alan Parekh Says:

    Hi Tim,

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

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  53. Online Clock Says:

    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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  60. sonic boom alarm Says:

    This looks pretty powerful, but I still would only trust a sonic boom alarm clock. Seriously… I used to set a minimum of three alarm clocks in my bedroom each night just hoping one would wake me up in the morning and even with this I would still usually be late to work. However, once I bought the sonic boom alarm clock I have not been late to work again. I love this alarm clock and it is the only one I will trust to wake me in the morning.

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  62. trafegodigital Says:

    very nice alarm

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  64. farhan Says:

    gud thing bt we can emplify it more.

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