|
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.
|
January 12th, 2008
whhhooooha, hightech mod
January 12th, 2008
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
January 12th, 2008
@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.”
January 12th, 2008
@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.. ^^
January 12th, 2008
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.
January 12th, 2008
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 ^^,
January 13th, 2008
[…] 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 […]
January 13th, 2008
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.
January 13th, 2008
Hi Tony,
Glad you liked it. Actually the clock was red, didn’t have to paint a thing.
January 14th, 2008
[…] 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 […]
January 14th, 2008
[…] 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. […]
January 14th, 2008
[…] via HackedGadgets alarm clock, alarm clocks, alarm signal, best solution, Circuits, clock circuit, Consumer, Cool, DoItYourself!, educational, Entertainment, fire alarm bell, Hack, interface board, interface components, job, piezo buzzer, projects, sleepalarm clock, alarm clocks, alarm signal, best solution, Circuits, clock circuit, Consumer, Cool, DoItYourself!, educational, Entertainment, fire alarm bell, Hack, interface board, interface components, job, piezo buzzer, projects, sleep var dc_UnitID = 14; var dc_PublisherID = 13853; var dc_AdLinkColor = ‘blue’; var dc_adprod=’ADL’; If you like this post then please subscribe to my full feed RSS. You can also subscribe by Email. Invest on our new One Buck Wiki or Five Dollar Wiki before prices go up. My friend Colbert is getting married, check it out on ProBloggerWedding.com. pay per click […]
January 16th, 2008
[…] DIY Fire Alarm Clock may be overkill, but hey, maybe you’re a little deaf? Eh? What’s that you […]
January 16th, 2008
[…] Read | Permalink | Email this | Comments […]
January 16th, 2008
[…] Read | Permalink | Email this | Comments […]
January 16th, 2008
[…] Read | Permalink | Email this | Comments […]
January 16th, 2008
[…] 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. […]
January 16th, 2008
[…] 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/ […]
January 16th, 2008
[…] dieser Fire Alarm Bell Alarm Clock - der Name! - wäre es wahrscheinlich nicht so weit […]
January 16th, 2008
So… how do you turn it off?
January 16th, 2008
[…] 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 […]
January 17th, 2008
[…] 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 […]
January 17th, 2008
[…] 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 […]
January 17th, 2008
Fire alarm bell repurposed for waking the dead…
Filed under: Household…
January 24th, 2008
[…] fire house alarm clock - if you don’t hate yourself enough in the morning […]
February 27th, 2008
[…] check out hackedgadgets for the full article with loads of construction pictures and detailed […]
April 16th, 2008
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.
May 15th, 2008
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!
May 15th, 2008
Hi Scott,
Thanks for asking, but I am keeping it. Sorry.
June 16th, 2008
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 !°;°
June 16th, 2008
Ey,I am ,,Davoriusan Dungeon ´´ from German !
June 16th, 2008
Oh,I diss you !