Instructables

DIY Amplified Speakers for your MP3 player

Picture of DIY Amplified Speakers for your MP3 player
There are quite a few instructables out there on making your own speakers for your mp3 player... and most of them don't use an amplifier! Without an amplifier you will barely be able to hear the music coming out of the speakers.

Here I will show you how to make your own stero speakers with amplification!

Video here:
http://www.youtube.com/watch?v=C4d4_k0mwWo
 
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Step 1: Gather materials

Picture of Gather materials
Here are the materials used:

Cardboard box - used as speaker housing, you can choose something more elegant
Drill bits - used to drill some holes
Two speakers - I chose a pair of generic 8 ohm ones lying around
Soldering equipment
Hot glue

Here are the parts for the amplifier circuit:
1x protoboard
1x TDA2822M amplifier IC
2x 100uF capacitors
2x 470uF capacitors
2x 0.1uF capacitors
2x10K ohm resistors
2x 4.7 ohm resistors (I used 3.3K and it worked fine)
IC socket
Misc. connectors

Step 2: Build the circuit

Picture of Build the circuit
Speakers 003.jpg
Speakers 004.jpg
Next step is to build the circuit. I used a TDA2822M amplifier and the schematic shown in its datasheet. You can choose to build your circuit with whatever amplifier IC you choose.

Step 3: Build the enclosure and install speakers

Picture of Build the enclosure and install speakers
Speakers 007.jpg
Now, put together whatever enclosure you want. I'm heading off to camp for 3 weeks tommorow, so I rushed and chose this... cardboard box!

Next I used hot glue to glue the two speakers in.

Step 4: Test

Picture of Test
You need to make sure you've assembled everything correctly. So test out the speakers!

The amplifiers will work up to a voltage of 18v. For testing I connected a small 4.8 volt rechargable battery.

Step 5: Put it together

Picture of Put it together
Speakers 008.jpg
Now that it works, put it together. I used hot glue and double sided foam tape to put everything together.

I used a drill bit to drill the hole for the audio in.

I changed the power system to 6 AA batteries in series, so that at camp I could just replace the AAs instead of bringing a battery charger.

Step 6: Drill that hole

Picture of Drill that hole
I'm no audio expert, but you need a hole in your speaker system to let the air out.

Step 7: Add a bottom

Picture of Add a bottom
Finally, I added a cardboard bottom.

Step 8: Done!

Picture of Done!
You're done!
Im kinda new with audio electronics, im using a headphone wire that is cut at the end for the input and it has 4 wires, 2 gold and 1 red and 1 green, if i use the green and red as the L and R input, where do the 2 gold wires go to?
Im kinda new with audio electronics, im using a headphone wire that is cut at the end for the input and it has 4 wires, 2 gold and 1 red and 1 green, if i use the green and red as the L and R input, where do the 2 gold wires go to?
argil3 years ago
if it is ok if i plug this amp with a 220v?
man every thing will just fry up and you wont be able to use it but yes you can use a 12 adapter instead of 220v
man every thing will just fry up and you wont be able to use it but yes you can use a 12 adapter instead of 220v
Glenn781 argil3 years ago
no it runs on 18 to 4.8 v
ajervis2 years ago
will the amp still play clear if i dt use a 10k on one of the input? BTW i hooked up everything right and the quality was terrible...
ajervis2 years ago
how i make the input go to one audio jack since they have 2 input and output parts for the amp.
Blak Wolf2 years ago
The triangles are just parts inside the IC right?
the bold lines are ground, triangles belong to the IC
and do the thick black lines at the ends there mean they go to ground?
Blak Wolf2 years ago
This may be a totally dumb question, but what are the triangles in the diagram representative of?
Reki32 years ago
Please excuse me for being s bit uninformed on this, but what do you mean by 'RL'? What resistors can we put in, and is it still necessary with small voltages?
talha913 years ago
Hi,

I am just a Beginner with this from Pakistan so the thing is that I cant understand this one step 2... The graphical Diagram of the circuit can u just make it rough like by Hand so I can better understand this step...

I know i can manage to understand it latter on by reading some articles on Google about electronic Circuits but if u can just share one more picture using pen and paper without straight lines....
bmxlive4 years ago
hi, at this step are you trying to say that i can build the same circuit but with other IC amp chip? i saw in differents instructables that every different amp circuit has differents components with some exeption like 0.1 uF capacitor. I would like to use a LMN386 that i can find in my local store but im not shure if i choose to use others components like this structables it will work. I hope you can help me
RazorConcepts (author)  bmxlive4 years ago
This schematic won't work with the lm386, you will have to use the schematic from the lm386 datasheet.
 i just wanna find  the amp on my radio to try to plug the  the wires from my jack to play my ipod louder

what do u conect to the end of the 100uf capasitors
zachzach5 years ago
i need more specific instructions on what to connect to the IC, and where did you get your IC (TDA2822M)
RazorConcepts (author)  zachzach5 years ago
I got the IC as a free sample from the manufacturer.

Here is the datasheet:
http://www.st.com/stonline/products/literature/ds/1464.pdf
who's the manufacturer and how could i get a free sample?
You could get a free sample by becoming an R&D department manager for a major corporation. It is illegal to sample from companies when you claim to be something you're not - i.e. an interested company, or student when you are not the one you said - and to sell a sample (whether as a part of a larger end-circuit, or as a single component) or barter with it, since it is meant for research and is meant to be used and discarded.
It is not illegal for a company to send you a free sample, I have requested and was sent everything from IC sockets, op amps, audio amps, even three axis acceleration ICs. On every request for I stated I was a hobbyist and wanted the samples for personal use. Of the 30 odd samples I've requested, only 2 were not granted, one for LCD switches, the rep said they were too expensive at the time for non-comercial requests. The other was denied because I did not have a .com email address. If you are honest and polite you should have no problems getting free samples. Hobbyist have created many inovative uses for products the manufactures never thought of, opening new markets for existing products. A Win-Win for both companies and Hobbyists.
bo-jangles4 years ago
would this amp be okay for a: •400 Watt Total Pick Power Handling (200 Watt Each) •Impedance: 4 ohms Each