Instructables
Picture of Portable speaker in a CD case!!
Have you ever thought of making your own portable speaker in a CD case? Here is how you do it.
 
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Step 1: Components required

- 8W speaker with 4 ohms impedance (Make sure the speaker's impedance must match your amp's specification or you would damage your amp!!)

- CD case ( Use the one with a zip would be good)

- 18W Amplifier module (I used the Kemo #M033, you can use other amplifiers as long as the Watts are not 2.5 times larger than your speaker's power level)

- Rocker switch

- 3.5mm stereo adapter

- Battery snap and a 9V battery

- Solder iron and some solder

- Glue gun

- Cutting knife

- Drill

Note that:
If you choose an amp that is supplying too much power to your speakers, then its clear that there is a chance that you will damage them. It may cause the voice coil to overheat, or the speaker could move back and forth too much (known as exceeding its Xmax).

However if you have a smaller amplifier you may have to run it all the way up full to provide enough power to your speakers. When running at full blast, there will be lots of stress on the components of the amps and it can introduce a significant amount of distortion into your signal, which is often called 'clipping'.

As well as sounding very bad, trying to reproduce a clipping signal can potentially do far more damage to your speakers that a little too much power.

Therefore the unwritten rule is that you should have an amplifier that is capable of 1.5 to 2 times the power rating of your speaker system, and only turn it up part way. The extra power available is called the headroom, and means that your amplifier should never been running at full tilt and therefore producing a distorted, or clipped, signal.
Kodak883 years ago
I would recommend not putting the iPod inside the case, as the magnets from the speakers could mess with your iPod's memory! Just a thought.
T0C Kodak883 years ago
Nah it won't... these days electronics almost aren't effected by magnets (excluding CRT monitors), here you don't have a tape to blank when you run a magnet by it :D. it's all just thousands and thousands of transistors (in chips of course well by that i mean , let's say you have a cpu in one of the older versions i remember there are about 73 mil. transistors and that cpu is from 2001 i think so....)
zgybrwn T0C2 months ago

you don't have to explainit when you say something simple like you are the smartest one every.

T0C zgybrwn2 months ago

I didn't quite get that, would you mind re-writing it a bit better.

Besides, the answer you replied to is 2 years old!

Kodak88 T0C2 months ago
I was actually responding to the other guy (zgybrwn) who responded to you. He basically called you a know it all for explaining your reasoning behind your comment to my original one. Also, not to nitpick, but my comment was worded properly in context, so I have no idea how to rewrite it for you.
It doesn't matter anyway, the guy was just being rude.
T0C Kodak882 months ago

Yeah, I got the part about me being a know it all, his comment just seemed unfinished the way it ended but I guess he/she doesn't speak English that well (not that I do).

The re-writing part was addressed to zgybrwn, I had no trouble comprehending you comment..

Also looking at the time our comments were send we must have sent them at the same time, hence the confusion about who replied to who.

Kodak88 zgybrwn2 months ago
Did you read the "we have a 'be nice' comment policy" disclaimer below your comment? Dude was just explaining his/her thought process, on a website *designed* to share information. So if you don't have anything nice to say,gtfo.
bigjeff5 T0C2 years ago
Just wanted to give you some updated numbers:

The Tegra 2 (used in many smartphones but is being supplanted by the Tegra 3) has 260 million transistors.

Most modern desktop CPU's have between 250 million and 1.2 billion transistors, while server CPU's can have up to 2.5 billion transistors.

Modern desktop GPU's can have up to 4 billion transistors.

Most people will never encounter an FPGA (a sort of reconfigurable CPU), but they can have just shy of 7 billion transistors.

A gigabyte of DRAM (the kind of ram in smartphones and PC's) has about 8 billion transistors.

A gigabyte of Flash memory has either 8 billion (SLC) or 4 billion (MLC) transistors.

It would take a horribly powerful magnet to mess with any of it, since they all off specific electrical signals at certain voltages which are incredibly difficult to generate by accident with a magnet. As you pointed out the magnets were a concern for certain magnetic storage technologies. Even then, while a floppy disk could be damaged by an errant magnet in the pocket, even modern magnetic hard drives require much more powerful magnets to destroy the data without physically touching the platters inside (hard drives actually have quite powerful magnets sitting right next to the platters which don't affect the data at all).

Simply put, it's not likely you'll be able to get your hands on a magnet powerful enough to hurt your smartphone, and you most certainly won't be able to get that magnet to fit in your pocket.
T0C bigjeff52 years ago
Yeah, the cpu i mentioned wasn't from 2001 but from 1991 or so lol.
About the hard drives, i've seen the magnets inside and they're really powerful but as you said they can't erase the data, to erase the data (and probably completely destroy it) it would take a magnet about as powerful as an MRI or something bigger.

There's always a way :) and most of the time it's fun as hell!
hajk2 years ago
Hello!

I wonder if i can make it work with a 80 Watt speaker?
hows the sound? assuming that your using a subwoofer the bass should be outstanding
rohaanwadia2 years ago
so if i am using 2 8watt 4ohm speakers then is a 30watt amp appropriate??
jholley13 years ago
i bought one like this but allready built
krayola3 years ago
panalo to dre! hehe gumawa din ako nung little gem and MKII na guitar ampli. this site is the best.. the ideas are the best..
ASCAS3 years ago
I would try to link you on a site where to buy a 4 inch 20W speaker 4 ohms. I already have one and here in our country (philippines) it only cost $2 in php-dollar converstion. The speakers give a high quality BASS, MID RANGE and TREBLE. Its worth every penny. I could even be sold for $100 because of it's quality.
dhvinay4 years ago
pls suggest me where to get the amp from...
any preferable online websites ?
LkArio4 years ago
That's nice, but 18W is too much for such a small speaker.
musick_085 years ago
how would you do this without the amp. ( I'm new to electronics.)
In my opinion: You can't feed speaker without amp. You could burn your device output.
ok thanks. i thought it would, but i wasnt sure.
ok i'm worrying bout something, surely if you are running the power from the 9volt through the stereo jack, it is being pumped into your ipod of mp3 player, doesnt that do damage to it? also, are the stereo jack, battery and switch in series on the input circuit?
of corse you could put a diode from th 9V
Jonas4124 years ago
You could just make a simple aplifing curciut with transistors ans a potentiometer
raikut5 years ago
But what if we don't get this type of amp in our country
it would be cool if there was a pot for a higher volume control other than what is on your I-Pod.
seraph6 years ago
would a 15w speaker work with the 18w amp? and also, where can I buy most of these components... do you think radio shack would have it?
bigern71 seraph5 years ago
check a hobby store also
it might though, radio shack has everything.
fatrickuk (author)  seraph6 years ago
yeah, it would work. I am not sure about radio shack coz I don't live in the US. Hopefully some people would be able to help you to find the components.
that's sweet...but what are you doing with a cd case if you have an Ipod?
ok, scratch that...I din't realize how big the speaker magnet was...but still sweet
armynavy175 years ago
Ok so I'm thinking about doing something like this but with two speakers. They are both 1W 4ohm speakers. I want them to still be stereo so do I need two amps? Should I use a 2W amp(s) or something else?
Or if I didn't have it stereo and I ran them both off of one amp could i use a 3.5W amp?
comodore5 years ago
Can you make this operate 2 speakers like 2 head phones? Great project man! I love it! PS: comment number 101! hehe
djshalford5 years ago
its been a while since i studied but if the two left and right signals are being combined pre-amp it shouldnt need the resistors? (or is that to stop any distortion?) and i have a double cd case and im thinking of doing a double speaker version since this design only puts one signal through amp (if it works) then should be able to double up on everything except stereo jack... i.e using the two mono signal amps two speakers two switches connected as seperate circuits with negative of batteries to negative inputs of individual amps and those connections connected together at the ground terminal of the stereo jack and two different signals (left and right) going to seperate amps and concurrently speakers. Please comment on idea usefull feedback might jog my memory to whats being missed in the circuit (besides a fuse) ... thank u
wow, i wanna make one...A few questions though. Where can I Obtain these supplies, and how much would all this cost to make?
it would cost about $2-$6or$10 you can get the supplies on ebay,radio shack,dump or junk yard for parts from cars old radio and also from old toys,radio. i got lots of parts at home
Picture 032.jpg
Plz reply i luv the mini carbon cone woofer!
Nice Speaker M8 where did ya geddit from huh??!! I like the carbon Cone
fatrickuk (author)  creative zen6 years ago
I got my amp for GBP £10 and you could get the switch and the battery snap very cheap from a normal electronics store or order them on ebay. It only cost me £12 to make one. (Note that I took out the speaker from my old stereo so I wouldn't count that.)
what does this mean? £. Can you convert that to U.S. currency?
fatrickuk (author)  creative zen6 years ago
1 British pound = 1.9561 U.S. dollars
so how much would that be?
about $24
i already have enough speakers though it's just having the speaker right in the open on the case it will wreck it thought. What if like water get spilled or if you drop it? then you're screwed. You can obtain these supplies at any place like Wal*Mart or like Totem or even an electronics store and it depends on the brand the more expensive brand the more money it's gonn cost you.
i love the fact u added a power source other then draining the mp3 players power supply. amazing instructable
callum33435 years ago
Hey, I when I went to buy the amp and what not from the store the guy there said that I'd get some interference, is this something anyone's found? Also, I have an 18 w amp, what power speaker should I use?
Where you might get interference here is on the wires from the phone jack to the amp. (The amp is probably screened.) To prevent this, use screened audio cable instead of two separate insulated cables. Screened cable has an insulated core surrounded by a wire mesh layer, which is in turn surrounded by more insulation. (Example here.) If you use the mesh layer for the earth (-) connection, it should effectively shield your signal on its way into the amp.

On the topic of the jack:

"Solder two wires on the stereo adapter, one in the front (ground) and one at the very left /right back (it doesn't better which side since it is a mono speaker)."

If you only wire it up to one channel, you will only get one channel out of the speaker, meaning you'll lose anything coming out the other one. (e.g. that guitar solo which the studio engineers only put down the right channel could simply not be played because you're only using the left). It would be better to wire both pins together, so you combine the channels into one.
Alas, I spent hours on end trying to cut my case with a putty knife, until I re-read the instructions and realized that I needed a *CUTTING* knife! =/

Very nice project though, I like the concept :D
sony psp is so much better then ipod psp :) can get up to 32gb on the memory card and you can conect a hard drive to it and ipod so high priced
You Can't connect a hard drive to a PSP.... you can use USBHostfs to access files on your computer ! And you can also buy devices that exchange data from an onboard hard drive to the psps memory card ! PSP's are any cheaper than ipods ?
Wha??? lol is that supposed to be "psp's are so much better than ipods" ?
signed215 years ago
how much will i spend in making this kit??
fatrickuk (author)  signed215 years ago
It depends. I got the speaker from my old hi-fi. The most expensive thing is the amp module, which cost me about 10 UK pound sterling. The wires, button and the stereo jack are pretty cheap.
and further, if it is set out as in the circuit diagram given, how is the circuit complete, i fail to see how this could work, i think i'll give one of me electrical engineer friends a call.
Made one into a laptop case because my speakers are very weak since its a big case there was plenty of room so thanks for the idea
joshd9636 years ago
Is it possible for this speaker to work with thisamp?? Thanks in advance.
joshd9636 years ago
Hi, i have found the same amp module that you (fatrick) used.... but i cant seem to find any 8W 4ohms speakers.... please could you help me out here? It would be much appreciated. I live in the UK. Thanks.
fatrickuk (author)  joshd9636 years ago
Have you checked Maplins?
umm ive checked the website.... i went to maplin the same day i read about this... but unfortunately i read this after i went to maplins :P But erm... on the web site i didnt see any speakers, only the amp... should i go instore and enquire? Cheers, Josh.
fatrickuk (author)  joshd9636 years ago
Yup, that would be great if the store isn't too far away from you. You just gotta find a smaller power speaker. If your amp is 18W (in which I assume it is!!), you should find a speaker with 8-12W would be fine. I know it's quite hard to find speakers like that in the UK. That's why I took out the speaker from my old hi-fi.
alright... thanks allot for your help!!!! i will take a venture up this weekend. Ps... in another instructable i saw somebody point out www.uk.digikey.com Apparently they ship to UK and have some speakers :P
mefjuu6 years ago
In that way you loose one channel. You should use two ~47k resistors and just connect both channels together to the jack. Then you have true mono
I was thinking instead of adding an input I just solder a 3.5mm jack onto it directly, anyone got any ideas or suggestions on that, and could I just get the cable and the jack by cutting it of a spare pair of headphones? oh and I am installing the speaker on my backpack any help would be great! Oh and +1 from me =D
maaark6 years ago
Hi, I'm using the Kemo M032 (12w instead of 18w). I'm building this as a miniature guitar amp. I got it working, but there's a LOT of hiss and the guitar input distorts to no end, even with dropouts and stuff. I want to solder in a potentiometer (10Kohm) to control the input signal... Where would it go? Also, my potentiometer has 6(!) legs... on the info sheet it refers to the two rows of three as R1 and R2. I think I just have to use R1, right? Is there someone who can help me with this?
Mario16 years ago
(removed by author or community request)
Mario1 Mario16 years ago
i checked it ... the speaker is 5w
Mario1 Mario16 years ago
1'st let me start with I had a mistake in my last comment the speaker works with 2 AA batteries each one 1.5v i think that the speaker is 3w but i am not to shore


if you want pictures of it my skype is mario1tracker and if u don't have skype just pm me with your e-mail and i will send them there ;)
fatrickuk (author)  Mario16 years ago
really? How powerful is the speaker?
altagu6 years ago
What kind of store should I be looking for an amp module in?
fatrickuk (author)  altagu6 years ago
Electronics store such as Maplin (UK) or buy it online might be easier.
um...my speaker works but the vocals are extremely quiet...?
fatrickuk (author)  screeching crow6 years ago
What is the specification of your speaker? What amp are you using and what power source?
speaker:4ohms, 10w amp:4ohms, 7w, 9 volt power source the amp is a kit I picked up at an electronics store by my house
fatrickuk (author)  screeching crow6 years ago
Your amp is too weak for your speaker. What I would suggest you is that you can get a more powerful amp maybe about 2 times more powerful than your speaker. For example, your speaker is 10W, you should get an amp which is around 20W. In this way, it would provide you enough sound.
ok thanks
nuffun14406 years ago
would a 2.5 watt speaker work with a 7 watt amp? Or is the amp to powerful
fatrickuk (author)  nuffun14406 years ago
I don't think you should use 7W amp on a 2.5W speaker. It's too powerful. Use a higher power speaker would be better.
ferny1216 years ago
hey. this is really cool. i think im gonna try this. but can i have the details on the speaker u used for this project?
pretty cool i'll have to try it sometime
Thanks also +1 rating
would you be able to add a volume control to this? also would this work with any mp3?
fatrickuk (author)  prototype22136 years ago
yeah, you may add a volume control but it would use up more power as it is a variable resistor. It would work with any mp3.
ultrauber6 years ago
i decided to make some diy speakers myself. what i did was take a male to male 3.5mm cable and plug it in to a female to male, 3.5mm to 1/4 inch adapter, and plugged that into a guitar amp. in the end, what you have is a amp with a cable coming out of it that plugs into a headphone jack. so because it works with a headphone jack, you can use it with ipods and other music players, plus game boys, cameras,etc. does this have stereo speakers? well you're definitely getting a +1 from me
fatrickuk (author)  ultrauber6 years ago
It's only a mono amp, so no stereo speakers.
power6 years ago
I made a smaller one based on your idea. Cool stuff.
fatrickuk (author)  power6 years ago
you should post some pictures of your speakers in here
Spinergy6 years ago
Realize you aren't going to get 18watts from this amp with a 9v battery. It's simple with no switching power supply so voltage in - amp efficiency loss = audio power out. The 18w figure is a "max" rating [not RMS] with 20v input. Clean power at 20v is about 14-15watts, at 9v you'll get about 5-6 watts of clean power. Not a lot but plenty to run a 4" speaker. A battery holder for 6-8 AA's would give much longer runtime than a 9v [at the expense of a little weight]. You could also hack a few cheap surplus lithium cell phone batteries as a power source. FYI those little “docking” speaker systems [even some expensive ones] are often running only 1-2 watts per channel, so you’re already ahead.

As to a speaker's power rating vs amp power; it’s a valid concept but for a low dollar low power app like this look more at the speaker's efficiency [dB] rating. The more efficient the speaker the more volume from your 5w or so of power.
Lets be clear here on one small thing. To achieve a doubling of volume, the human ear requires an amplifier of 10 times the power. We hear logarithmically, after all. Yes, I agree that a 9 volt battery made from Sigle Cells [aa, c,d] will last much longer. However, I champion guitar amps that players can even gig with that are 5 watts rms. All tube, too. Bill Frisell has a couple of them; he has gigged with em, too. So the comments on power, I find, well, underwhelming. 20 watts is only twice as loud as 2 watts. 2 watts will get fewer neighbor complaints anyway. Yet, rock heavily. Especially if you are "older" like I am. Speakerlabs did a graph that illustrated this point in the 70's; it was a graph illustrating power in watts versus years of age over time. It was, and remains, brilliant.
You're missing a KEY point in your "5 watt guitar amp" analogy; those amps are fitted with large high efficiency drivers in optimized enclosures. 5 watts into one of these 100+ dB 12" or 15" drivers can generate lots of volume in mid- high frequencies. While this is great for guitar players, not so much for full range music on the go.

Small wide range drivers suitable for this app have MUCH lower efficiency ratings, typically in the 82-85dB range. Since every 3dB drop in driver efficiency doubles the wattage needed to generate a given volume, even at 50 watts {which would kill them after a few seconds} these small drivers aren't going to play anywhere near as loud as a typical guitar amp speaker at just 1 watt.

One question. What point am I missing? Are you saying we hear, like, linearly over power into Any Given Speaker/Enclosure set? Perhaps there is some defensiveness towards basic physics on your part. I champion low power to reduce our carbon footprint. Batteries end up as toxic waste. Whats wrong with realizing that power is often misused to our detriment? We really don't need to waste so much energy to say, hear our music, while elegantly using old cd cases....
by the way, my 5 watters run a 10", a 12" or the massive 4 x 8" bottoms. I am an older fellow. I am tired of stereo wars and boom box, 1200 watt cars that sound like earthquakes when they drive by, windows up- and cause soft tissue organ damage to the clueless youth in the car......!
Thats why I am glad that the instructable is not a "high power" amp. And, while most smaller [read: cheap import] speakers are less efficient as a general rule, this is not always the case. My dad used some samsung 16 ohm 4" drivers in a 4 x 4 array box, and got the police called on him with a 50 watt amp [and was banned from using them on campus, too...]- And yes, 16 speakers ups the apparent efficiency. There are some terrifically efficient 5-6" drivers, not made for hifi or subwoofer use that are in the 92-95 dB 1w 1 meter range, too, if one wants to make an asshole loud unit. I do not endorse such an invasive device, however elegant it seems. Look- My point is power is not what it is hyped up to be. This project is battery powered. Its not for a dBspl drag race. Its a fine project. It sounds great to me. I just wanted to temper the "Power Trippers" with a bit of common sense.
gredd6 years ago
Great Instructable. This is the best iPod speaker solution I have seen. Very simple and functional
comodore6 years ago
Shouldn't I a 16W instead of the 18W amplifier? You sad that the value of the amplifier should be 1.5 to 2 times more powerful than the speaker, so if I have an 8W speaker I should use a 16W ,or less, amplifier,right??? All in all a great and fun project! Good work! (rating +1) (added to favorites)
fatrickuk (author)  comodore6 years ago
Thanks for the rating by the way!!
No problem! :)
fatrickuk (author)  comodore6 years ago
Yes, you could if u found a 16W one but I am not sure if there is any outthere. Kemo only sells amplifier with 12W, 18W and 40W. A 8W speaker would definitely work with a 12W amp. I used a 18W one because I might ungrade my speaker in the future. Never use a 40W amp with a 8W speaker because it would blow it up. Yes, you could even use a 3W or 7W amps that made by Velleman.
OK. Thank you!
PsyOp6 years ago
This is a mono setup. What would be the necessary changes to make this a stereo setup?
fatrickuk (author)  PsyOp6 years ago
If you want to have it in stereo setup which means 2 channels (left and right), you need a stereo amp. The one used in this project is a mono amp. However, you could connect it with more speakers either in series or parallel. Though you need to ensure the impedance of your connection method is not lower than the impedance level stated on your amp or your amp would be damaged.
jinventive6 years ago
When choosing speakers for an amplifier, what you said needs to be the other way round, you need a speaker with more watts than your amplifier otherwise you could risk blowing the speaker. They aren't that expensive though :)
fatrickuk (author)  jinventive6 years ago
If you choose an amp that is supplying too much power to your speakers, then its clear that there is a chance that you will damage them. It may cause the voice coil to overheat, or the speaker could move back and forth too much (known as exceeding its Xmax). However if you have a smaller amplifier you may have to run it all the way up full to provide enough power to your speakers. When running at full blast, there will be lots of stress on the components of the amps and it can introduce a significant amount of distortion into your signal, which is often called ‘clipping’. As well as sounding very bad, trying to reproduce a clipping signal can potentially do far more damage to your speakers that a little too much power. Therefore the unwritten rule is that you should have an amplifier that is capable of 1.5 to 2 times the power rating of your speaker system, and only turn it up part way. The extra power available is called the headroom, and means that your amplifier should never been running at full tilt and therefore producing a distorted, or clipped, signal.
Yes, you are correct but many amplifiers these days have various protection circuits integrated into them so that there is a smaller chance of clipping, distortion and various other problems that make the output sound bad. Also if you overpower speakers, there is more chance of blowing them than there is if you operate your amplifier at full tilt constantly. Also most amps these days such as the higher power version of this model Kemo M034 have a facility to mount a heatsink to a metal flange on the rear which dissipates the heat produced by the IC. The version of amplifier included in this Instructable doesn't need a heatsink though, as not much heat is produced by the IC.
fatrickuk (author)  jinventive6 years ago
I understood what you're trying to say. It does make sense if you use full power for your amp. I would say that using a 9V battery with the 18W amp would be safe for the 8W speaker. Kemo M034 of course is way too much since it is rated at 40W. Thanks for your comment though. Are you an electrical engineer by the way?
Yes you are right but if you turn the volume up to full you have a good chance of still blowing your speakers, so you just have to keep the volume low. BTW I am not an electrical engineer as I am only 13!
I always had it explained like a car You don't by a car with a small engine and drive it on the rev limiter to go fast you buy a car with a bigger engine that doesn't have to run to its full capacity the rev limiter is there to protect your engine, not to be run on as a limit same with amplifiers You don't want to bounce off the protection circuit just coz you can you get a slightly larger amp and run it below its full capacity again, the protection circuit protects the amp, its not meant to be used as a limit You guys seemed to of worked it out anyway, just putting in another view that helped me understand it in the first place
Thanks for the comment, I think I might remeber it like that in future. I usually buy amplifiers that have less power than what they're powering because I tend to turn the volume up quite high to test the speakers and their sound capabilities.
fatrickuk (author)  jinventive6 years ago
Pretty good as a 13 years old. It seems like you know something about electronics. Well, you would damage any speakers if you run it at full power.
Thank you! I like making electronic devices at home such as torches, coilguns, wired robots etc. My current project is an audio amplifier. I agree with your comments though.
fatrickuk (author)  jinventive6 years ago
Keep up with the good work. You should post some instructables as well !!
Thanks! I might post an instructable but I think it might be too hard to put together because it requires special parts.
nah956 years ago
Do u have any ideas on how to make a smaller speaker?something that can fit your pocket.my ears start paining if I use my earphones for too long.
fatrickuk (author)  nah956 years ago
Is that for the pocket sized challenge? Maybe you could just buy a smaller speaker, like those flat panel ones. You don't expect good sound quality though.
lawizeg6 years ago
Maybe if the case was bigger, you could have a CD player inside...
fatrickuk (author)  lawizeg6 years ago
Well, not many people use a CD player nowadays so I used a compact one in here. It fits an ipod nano inside though!!
lawizeg lawizeg6 years ago
And the buttons could come out of the side so you could blast the music! and control it.
i never actually saw the rocker switch in this entire thing
fatrickuk (author)  four_eyes9546 years ago
Look at step 2 and step 3 the third picture. I placed the rocker switch on the side. Light up your screen so you can see it.
Great Instructable!! I was wondering where did you buy the amp and speaker? Thanks
fatrickuk (author)  joejoerowley6 years ago
Thanks for the comment. I got the amp from an electronic store called Maplin in the UK and I took the speaker out of my old stereo. Search for Kemo amplifier on google and I am sure you will find the one that I used. The model no. is M033.
Smart, and nicely done! Your Instructables Robot patch looks better than mine... Nice job anyways! +1 rating.
kingvader6 years ago
Good job i gunna make it 0_o
This is so cool! All of your Instructables are awesome!
Thanks dude!!
Your Welcome!
gamer6 years ago
how much does the amp cost? i am very interested in making a stereo amp of this type, my fathers friend just gave me a pair of very nice speakers. what about the sound quality? nice instructable! i only wish it was a little smaller so you could enter it in the pocket entry :( too bad, eh. -gamer
fatrickuk (author)  gamer6 years ago
I got the amp from an electronic store for around £10 UK pound sterling. The sound quality is good as long as you don't blast it too loud. It also depends on what kind of speakers you use though. I used a 8W one. Yeh, I wanted to enter the pocket sized contest as well but I think it's a bit too big for it. Let me know or show me a picture of it when you finish making one.
gamer fatrickuk6 years ago
thanks... well.... im gonna check addison if they have it :) not too expensive, its gonna take a while for me to make it, i have to order the pieces... but when its done, im gonna show ya... -gamer ps. thanks for the quick response.