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# Make a Guitar Amp from Old Computer Speakers..How? Answered

I saw this video on youtube:

And I was wondering how he made that. So my question is, do any of you know hoe to make one of these? Or have you seen plans on how to do it?
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I've been researching this very same question. The difficulty lies in matching the impedance of the guitar pickup's output with the expected "line-in" level of your standard computer speaker system (or your home stereo receiver, etc.)

The solution I plan to use is to build this simple buffer circuit to provide impedance-matching: http://www.jensign.com/mig/index.html

Eventually, I hope to produce a dual-purpose portable amp that can be used as a guitar practice amp or as a speaker system for an mp3 player, cellphone, what have you. When I post the instructable, I'll link it here.

most batteries beside 9volts and those tiny watch batteries are rated at 1.6 volts

anyone know if its possible to rig up a computer speaker amp to run off a 9 volt battery? was trying to make my own portable mini amp similar to the cigarette pack amps out there

look at the wallwart and tell me the volt output and the current output (mA)

i don't have the speakers yet, was just going to get some at goodwill. thought i'd do a little research first see if its even possible since i know nothing about the subject. should i look for speakers with 9 volt output? any particular mA better than another for this application? thanks for the help

i guess you use standard grey rectangular hifi speakers or something like that if they use external power supply there should be written how mouch volts they take if they use internal txformer then check if the volts are written on it. if no then measure. 6 V is a good guess if its something between 9 - 15 V its ok if its lower you should get the correct voltage with AA batteries instead (stack them in a pipe) i recommend to use AAs anyway cause they work much better the wires that came from the input / txformer go to the battery + -

ok. i got some 15v speakers, you think 2 AAs will be enough to power it? the plug for the transformer is soldered directly to the circuit board. any easy way hook up the battery pack? i don't have the cord but could prob find one

you probably can open them and wrap wires to something inside if you give photos maybe i / some1 can find where exactly the speakers are likelo to work ok on 9 - 15 V. thats 6 - 10 AAs the way i connect AAs is stack them in a pipe or cable rail and connect from the ends

I finaly made one, but when ever i replace the speaker with an output jack everything goes fuzzy, so I might just turn it into a practice amp.

I actually have been planning to do this. I saw the Instructable about re-housing some computer speakers in a single housing (a plastic storage container), and realized that it would be easy to make an Amp out them. After some extensive web searching, I realized that there are some issues though: Mainly Ampped computer speakers have a much higher input impedance than a guitar or mic output (ie. they need a "louder" input signal than a guitar or mic puts out). They work just fine if you "pre-amp" the signal, and I have had good success by using my Danelectro Fab Distortion (set on clean, with the volume cranked). It's not terribly loud though, but good for a practice amp. My project that I am planning to do (and make into an instructable) will be to turn an Old HiFi and speakers into an amp. It should be pretty easy, and basically follow the same idea as the instructable that takes a walkman apart, and stuffs it in an altoids box as a headphone amp... It'll be a month or tow before I'll have the time to do this, so be on the lookout!

Ok, I figured it out. It had a litle 3.5mm plug on the end, so I cut that off and replaced it with a 1/4" jack.

Just replace the earphone sized plug on the amped-computer speakers with a guitar sized one. Since the computer speaker amp is stereo you might want to try different connections to find one that comes out of both (or 3 if you have a subwoofer) speakers. It's easy. If you hear a buzz all the time, try rewiring the plug differently. You can also buy an adapter plug. If the speakers don't plug in with a wallwart they aren't amped so it won't work. Amped speakers also tend to have lights, knobs, and sometimes a subwoofer.

just put a female to female cable at the end of your speakers and plug in your guitar.

As far as I can tell, it's just a set of small speakers stuck in a box with a small audio amp. You should be able to use powered computer speakers if they have a microphone input.