Step 16:

Solder the speaker wires to the amp where it is marked LS.
I cut apart an old pair of headphones and used the cord to connect it to the amp. Cut the cord and tie the white and red cable to the red cable marked IN on the amp. Solder the negative cable to the negative and your are finished.
This is not much of a help I want to build an amplifier from the scratch meannig not from a discarded or pre existing computer amplifier from a desktop nor laptop speaker system. <br> <br>This is much more of putting together all working pieces muck more like a jigsaw puzzle. <br> <br>Its is much better if there was an schematics like a stereo amplfier with sub woofer output power by DC 12 volts that has an ouput of 200w per channel. <br> <br> <br>
It's easy to make an amplifier <a href="http://www.discovercircuits.com/A/a-audioamp.htm" rel="nofollow">circuit</a>.
If anyone is interested, if you google the TBA820M power amp IC, its a great sounding little amp circuit and the test/application circuit is included in the data sheet all you do is change one value of resistor for the gain, I use it in my school and each circuit works out a lot less than $10, just means you need to be handy with making you own PCBs or vero/strip boarding. Also it runs well off a 9V battery
<br> I like this iPod amp. This is what real hobbyists / enthusiasts are made off!<br> I used to like tinkering around with electronics and making various devices.<br> <br> <a href="http://discoveryelectronics.co.uk">Tony</a><br>
can u please provide me the amplifier circuit diagram with exact component listed....
Hey Rahul - The amplifier kit from Velleman includes the instructions and all needed parts are included for the amplifier circuit. <br><br>-Joe
you could've just cut out the seperators you know :P
<strong>I Have Kits!</strong><br/><br/>I have been asked for parts and where to get them a lot since I posted this. If anyone is interested I have kits now with everything you need to build this for $60 + shipping. <br/><br/>Send me a PM with your email address if you are interested.<br/><br/>Thanks,<br/>-Joe<br/>
Where did you find that box!? I want one! D:
Lol I've put pencils and screwdrivers through my speakers more than once. A little bit of screen isn't a bad idea.
I haven't learned much about electronics, but this makes your ipod or mp3 player be able to "power" a large speaker? I tried once connecting my iPod to a small radio speaker I salvaged, but the sound was really quiet. This would theoretically make it louder? Thanks
Yes, by the looks of this amp it should be VERY loud, running off two 9v. If you're looking to do something less complicated, you can salvage and old personal radio into an amp, but some components may require changing (resistors) otherwise it will be very distorted, plus it only uses 3v instead of 18v.
I've made some out of old computer speakers before. Many of them will run off of 9v/12v. Or you can keep the original plug and just plug them in. <br><br>I've found that many computer speakers can be greatly improved by putting them in a good box :)
Your mp3 player doesn't power the speakers, the 2 9V batteries power it ;)<br><br>The very quiet bit is still there, but it's amplified using the batteries (doesn't drain your ipod, big plus also :P)
Hawt Case<br />
I am about to start this project for my Zune using a dry box and a marine speaker for canoeing, but the one thing I am tring to figure out is if the speaker magnet will wipe out my Zunes hard drive. Anyone?
If it uses a hard drive instead of flash memory, more than likely, you want to keep as much distance between the zune and speaker as possible, between 10 and 20 cm should be fine.
hi, i want to build a small amp like this but i want to know if i would be able to plug my guitar into it!? it has an output jack for an electric guitar right.
I want to built a system like this but louder. Can you help me?
vacuum tube amp!
sorry the bottom pin was supposed to be two spaces along so that it went just below the gap
hi, great instructable, i was just wondering I have an amp that I made in a resistant materials class at school and I wanted to make it a stereo amp. How do I split the channels? I believe it is using the jack connecter but if so then which pins do I use? On the PCB they go. || || |
I am interested in this concept for speakers on my boat. I would love to know if you think it has enough power to be heard over the engine. Thanks, Doug
Doug, well it without a doubt loud! And on the boat I guess you have 12v so you power as many of them as you want. Go for it, Velleman also sells a 25W stereo amp that you might want to check out, that way you could enjoy the stereophonic sound while you are in your boat. -Joe
will it work with 2 amp circuits in series to add onto the power?
yea. thats what i did
i doubt this has enough power. it would be great when the engine is off however and it looks friggin awesome! i've got 2x 250w speakers on my tower and i can barely make out what's being played when i ride, they are long throw woofers, and they are on BLAST. forget about hearing the low range of music regardless of how loud it is, it all blends in with with the vibrations of the motor and the water. good luck with your boat!
This is awesome, but where do you get that army surplus box?!?!? But good job though
This is pretty dang nifty. I'd make one, but I've never been good at technical-stuff... LoL.
How many watts is the speaker? great instructable, this has really inspired me to try something
wow brilliant look! rough and tough!
confusing, but i like it. good job!
This may sound like a stupid question but could someone please explain to me how an amp works. i.e. why couldn't you just have a variable transformer (as the power supply) and the input signal controlling a transistor??? Any help appreciated.
What all do they sell in army surplus stores? I've never been to one. That box is pretty sweet though.
alot like the foxhole army place in puyallup
bdu's flak jackets, old guns, military helmets, gas masks, and much more
Awesome use of another kit to make this. It makes it 10X easier for everyone, so that they dont actually have to make the PCB. Good Work.
can you hook a guitar up to it ???????????? ? 00 ~
my guitar hook up is a adapter to a rca conecter wired straight to my stereo, im to cheap to buy an amp
This is very clever - I bought a set of amplified speakers at a clearance store for about $10, and I have an old army first-aid box - I'm going to use them, along with my jigsaw (with a hacksaw blade) to make this project soon.<br/><br/>That said, I hate to tell you this, but your idea has a problem. The amp you are using is mono, and you say that you have attached both channels from the iPod into the one input connector on the amp.<br/><br/>Imagine this - you are listening to a tune on the iPod, and that tune for whatever reason is only on one channel, either left or right (Pink Floyd does this sometimes, so that it seems like the music is coming from the right, then the left, etc). This means that there is high voltage on one channel, and zero volts on the other. When you connect high voltage to zero voltage, that is called a <strong>SHORT CIRCUIT</strong> - the left channel is shorting to the right or vice versa, and it stresses the circuit. In general, you should NEVER attach two outputs together without some circuitry in between, or you may see fireworks in the future.<br/><br/>The iPod is probably designed to handle some shorts, but if I were you, I'd put resistors in series with each individual channel , and then a resistor between the amp's input and neutral. This is called an isolation pad, and it protects the iPod's outputs. I'd use maybe 2.2Kohms for each of the three resistors (you should experiment with this on a breadboard - you may not need the resistor between input and ground depending on the amp's impedance). Granted, it will attenuate the signal, so it will sound softer, but if you have a good strong amp, just crank it a little more. At least then the iPod will be protected.<br/><br/>Once again, hell of a good idea for iPod use in rough conditions. You could even waterproof that that thing!<br/>
You will NOT have the short circuit you described. Each channel will still have a load but it will be bit lower since you have both channels running into it. Due to the circuit impedance, that's where it will load it a bit. Where you go bad is when you use a mono connector in a stereo jack, then one channel DOES get shorted to ground and that's a no load condition and will ruin one channel. The amp should have a fairly high Z input and should be OK. Sorry ...but exabopper is off base here.
I was interested in learning how to make the amplifier. Apparently you used a kit. Anyone have a good resource on how to make a amp from scratch?
<a href="http://www.instructables.com/id/EISBRXSF54HOCTI/">http://www.instructables.com/id/EISBRXSF54HOCTI/</a><br/><br/>you can learn by reverse engineering<br/>
find an old component reciever or stereo... they usually have pre-amps that you can harvest. these usually run on 12V or 9V, so it's easy to find a psu
Hello, Jongscx I read your question with delight, but I could not understand it. From what I can read do you mean to the speakers that you connect to a computer? (Also, anybody who has come up with a brilliant idea on how to make a guitar amplifier cheaply and simply, please do reply.) I do have this therory on how to make an amp out of some PC speakers. I might post as soon as I have done it.
I don't think this is the kind of "amp" you're looking for. This is basically an i-pod speaker. It takes the audio input from the I-pod and pushes that through the speakers. The difference between this and a guitar I believe is that the guitar is essentially "powered" by the amp. Someone correct me if I'm wrong, but I think that a guitar amp actually pushes current through the guitar. This just takes the signal and amplifies it, makes it loud enough to be heard. If you could find some way of having the guitar be powered, you could definitely connect this amp or even computer speakers and hear it through that. Anyone know the nominal voltage/current that's needed for guitars?
"When you say guitar been powered" , do you mean the amplfier built in an electric guitar? I confused.
Not necessarily. Here is an explanation on how an electric guitar's pickup works:<br/><br/><a rel="nofollow" href="http://entertainment.howstuffworks.com/electric-guitar1.htm">http://entertainment.howstuffworks.com/electric-guitar1.htm</a><br/><br/>What I mean is that there needs to be at least a little current running through the pickup... How much, I'm not really sure. So not exactly an amplifier, but I guess a pre-amp so that your transmitter has enough of a signal to be able to send to the reciever... Kinda Like:<br/><br/>guitar plug ---&gt; pre-amp (May be built into transmitter) --&gt;transmitter <strike></strike>[radio waves or IR]<strike></strike>~&gt; Reciever---&gt;Speaker driver/recorder/whatever<br/>
whoops... the [radio waves or IR] was supposed to be ( "radio waves or IR" )

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Bio: I like to tinker with just about anything, sometimes it works out in the end. Have fun looking at the projects, try tearing something open ... More »
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