Alarm Clock Loudener

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Intro: Alarm Clock Loudener

A reliable (modified) alarm clock that will wake the dead. I put this together after having several wind-up alarms break on me. It's basically an electronic alarm clock modified to trigger an alarm bell. Since I'm pretty much comatose when I sleep this is just what I needed.

Step 1: Get Materials

Here's what you need to make this:
1.Alarm clock - mine is a cheap one that I got from Walgreens. It gets it's power from the mains and has a 9v battery for backup. I don't remeber how much it cost but it was probably less than $15.


2.Some basic knowledge of electronics and construction techniques. (really?)

Step 2: Get Materials

3.Some sort of doorbell or alarm bell that is loud - The electromagnetic kind work well.(If you use something different then you may have to change wall wart #2) I got mine from eBay. It's like the buzzer type of old doorbell but with a hammer and bell attached.

Step 3: Get Materials

4.(2) Wall wart type power transformers. #1 is 9v DC output (somewhere around 350 ma) and #2 is 9v AC (@500 ma).

Step 4: More Materials

The rest you need is:

5.Relay - 12vdc coil, and able to handle your bell supply power.

6.555 Timer - I think pretty much any standard variation will work.

7.2n3903 Transistor - (this may be superfluous)

8.1 M Ohm Resistor

9.Some hookup wire

10.Extension cord - this is optional, but if you use one make sure its the kind with 3 outlets so you can plug in the clock and two wall warts.

11.hardware and some sort of case to put it all in

Tools

solder, some sort of support (pcb, breadboard, etc.), soldering iron, multimeter (or just a voltmeter), wire stripper, screw drivers, a knife maybe

Step 5: !Warnings!

OK, a couple of warnings:

1. Just so we're clear, you need to exercise extreme caution when working on this project. Don't work on aynthing when it's plugged in!!! I've been electrocuted many times and it's never very fun. Make sure that the circuit is insulated when it is plugged in (by a case generally).

2. The 555 chip can be damaged by static discharge. In fact I usually buy doubles for this very reason. Don't wear static prone clothing and leave the chip in it's packaging until you're ready to use it.

3.The ground shown in the schematic is a floating ground, which means that it is exclusive to the circuit and SHOULD NOT be connected to earth ground (mains).

4.I'm not that knowledgable when it comes to electronics so this is presented as I did it. There is a lot of variation that could happen with different components and some things may not work together.

I think that's it... just use common sense.

Step 6: Open Your Clock

With it unplugged, open your clock (no touchy capacitors) and solder two lengths of wire on to the buzzer disc/ speaker (where the 2 wires from the clock circuitry are soldered on). Run the two new wires out of the case (I used the power cord hole) and button the case back up.

Carefully clip the ends of the wires to your meter. and plug the clock in (sorry for the safety contradiction). Your meter should read something like 16 volts. If not then your clock may not work, although with some basic electronics knowledge you could probably get it to work. But this setup may work anyways with a range from 10v to 18v approx.

Finally, with your meter still connected, get the alarm to go off. The voltage should drop to around 7-5v when the buzzer sounds. If so, then you have a winner.

Step 7: Wire It Up

(you may want to breadboard this first to make sure it works.)

Construct the circuit using your favorite method. and wire it to the other components as show in the schematic.

Step 8: Button It Up

Make a case for the guts (wood works well for this). I made a box with the necessary holes and put the circuit, relay, wall warts, and outlet end of the extension cord in there. I mounted the bell to the top with screws and the clock with velcro. That's pretty much it...

Step 9: Take It for a Test Drive

Set the alarm for some time in the future and enjoy!

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    62 Discussions

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    lane29

    8 years ago on Step 9

    REALY!!!!,       no one comented on this pic at all,     REALY!!!!   ;<]

    1 reply
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    huspomikelane29

    Reply 3 years ago on Introduction

    JFC, man. You want comments? Try spelling as if yer life depended on it...

    Apologies. To be nice, "that's a lovely picture. Where'd U find it?"

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    Lucidman

    8 years ago on Step 1

    @sgamer1771, If you want expieriance, just fiddle arounf with old, or broken stuff to see what it does.

    2 replies
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    EsmagamusReCreate

    Reply 9 years ago on Introduction

    He would be, if I was the avenging friend. 220V flowing through aluminium tape under the sheets. Never fails!

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    ReCreateEsmagamus

    Reply 9 years ago on Introduction

    Well...that would be kind of a bad idea, as you would need to arrange them in a way...besides, anyone doing that to you would never have been your friend...Anyways, Something having to do with flyback transformers is more fun :D

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    Lance Mt.ReCreate

    Reply 8 years ago on Introduction

     Fly back transformers? Please.. its all about the 30 alarm clocks built into the walls (._.)

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    taylrock

    8 years ago on Step 4

    make the list[s] in paragraph form

    the numbers get confusing >:(

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    uzerzero

    11 years ago on Introduction

    I'm a personal fan of some of the Rube Goldberg "wake yourself up" machines, where the alarm goes off and effectively drops a brick/bucket of water/cat etc. on your head. For the most part though, I tend to wake up fairly easily with a generic alarm clock set to buzz, or my cellphone set to 1812 Overture :) vibrating alarms help too. If someone comes in there to wake me up though, I'll be in a bad mood allll day.

    2 replies

    me and my friends have a proposal to make an alarm clock that sack whacks you repetitively until you get up. and another one that has a hydrolic ram under your bed and rams you into the ceiling where there is a big fist....