This is one of two portable speaker systems i wanted to build.  I used the LM386 circuit from my previous instructable and incorporated it into this portable speaker system.  It is a single channel (mono) speaker system which lights up blue in the background when you turn it on.  I hope you enjoy this one and feel free to give me suggestions or ask me to clarify anything that may be confusing.

Step 1: Obtain Parts

All Components (except for Acrylic Sheet) can be found at RadioShack.

Multipurpose PCB with 417 Holes painted black
4.5-9 Volt DC power supply (3 or 4 AA or 9v Battery)
8 Ohm Speaker
Audio Source e.g. iPod
Acrylic Sheet from "Lowe's"
Project box
 2X Blue Square LED's
Mono Audio Jack
8-Pin Retention Contact
IC1      IC                                       LM386 Audio Amp IC
R1      Resistor                            10 Ohm
R2      Resistor                            1K Ohm
R3      Potentiometer                  5K Ohm
R4      Resistor                           10 Ohm
C1      Capacitor                         220 Micro Farad
C2      Capacitor                         10 Micro Farad
C3      Capacitor                         220 Micro Farad

Do i need 9 volt battery or 5v?
What wattage do the rrsistors have? And voltage do the capacitors?
<p>Good looking design. However, I'm not sure why you put the 10ohm resistor in the power lead? It's just wasting power by creating a voltage drop for the amp. I'd also only use one LED, but put a dropper resistor in series with it (maybe 47-220ohms), firstly to save power and secondly to protect the LED from over current.</p>
<p>that's a whole different can of worms. Try using an arduino or something like that. Google it, see if you can't find something open source.</p>
<p>Hey! <a rel="nofollow">He</a> copied ur 'ible exactly!!! This is no fair for u.</p>
<p>where i can get amplifier without building it</p><p>this is awesome instructable</p>
<p>Thanks for the circuit! I went a little lower budget and used whatever I had around. Someone asked me why I didn't just taking the output from an MP3 player directly, so now I'm curious now its power output.</p>
<p>An update - I compared this to my iPod's unboosted output with my old oscilloscope. The tone-generating app I was using put out a node-to-antinode voltage of about 20mV (unless I misread it) and this circuit rendered it fifty times higher at 1V!</p>
<p>can i build the circuit without using Potensio 5K ohm what happen if i do not use it</p>
What do I need to connect to the audio jack. Please respond as soon as possible
<p>Brilliant instructable mate. Quite easy to follow, however I reckon you made your final circuit more complex and bulky than necessary, but hey, whatever gets the job done works I guess. </p>
Can i power it with a 3.7v mobile battery?
based on this instructable should I use 6 capacitators ?
<p>Nope, you only need 3: 2x 220 uf capacitors and 1x 10 uf capacitor.</p>
<p>Brilliant instructable mate. Quite easy to follow, however I reckon you made your final circuit more complex and bulky than necessary, but hey, whatever gets the job done works I guess. </p>
<p>any step by step tutorial for this? cause i dont know how to connect the input and how to bread board it ...............sorry im not very good at electronics</p>
<p>any step by step tutorial for this? cause i dont know how to connect the input and how to bread board it ...............sorry im not very good at electronics</p>
<p>Hello sir,</p><p>i have index subwoofer which is not in use now </p><p>so i need to use it as mobile speaker </p><p>so what can i need to do for making it mobile speaker </p><p>can i need to use power supply for it and</p><p>need any extra circuit ?</p><p>i have no knowledge about it please give me instruction</p>
<p>Great I'ble :D<br> I did have to add a 0.047uF decoupling capacitor at the output and a 0.01uF capacitor at the input to make the audio much better. Yet to package it though...<br>Tests:<br>Thanks again for the cool instructable :)<iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/7MYn70F_saU" width="500"></iframe></p>
<p>can u tell me hws much volts are the capacitor of?? plzz..Thank You</p>
I've been working on this by following the schematic . . But the only thing is the output is very low . . . like i need to shut off my ears to the surrounding things and get closer to the speaker to hear it . . But when i try to increase the volume its getting distorted . . . Can somebody help me out to fix it . . I haven't used the LED's to save power and running on a 9v battery . .
you should Built in a amp sircuit and i think you can use caps on the output to smoothe the sound
<p>Does anyone have any ideas on how to make something like this but much bigger?</p>
thank you! I was looking for how to build a speaker, with the amplification and everything, so I can make a speaker that is nice and loud for my laptop. Most things I found here were just taking old speakers and taking the board out of it, but I do not have any. I will use this, though I will substitute a battery for USB power. the cords will be attached directly, and will be able to roll up and be tucked into the unit and then closed back up, via a latch.
nice project, but i noticed you wired the blue led's directly, i believe they need a resistor to keep the current low!
Use USB power!
How much did it cost to make it?
I don't know if you are aware, but somebody seems to have stolen your instructable - <a href="http://www.instructables.com/id/Battery-Powered-Portable-Amplifier/" rel="nofollow">http://www.instructables.com/id/Battery-Powered-Portable-Amplifier/</a>
i was gonna say the same thing here........I will post it in the forum...will see if anything comes up
Nice tutorial man, I want to make one with 2 speaker, what change will I have to do. What hardware need to be change. can you please update the list for me. and should I use 2 9V cell. and where should I connect the 2nd speaker.. I'm new.
What are the green wires there for? And are the 220uF Eletrolytic Capacitors suppose to be on the bottom of the PCB board or on top?
just curious, will it work without the potentiometer<br>
Yes, it will work, but you'll have no choice for volume. You should put a trim pot or normal 5K resistor in it, then. But why not just buy a potmeter and place it in to make a volume knob.
nt sure if my ic connection is rite<br>
please i just joined the site, but am having problem, after connecting excluding the speaker and audio input, just to ensure continuity, the lights came on, but on puting d others, no sound. help moi, u can reply to my mail.. gbollyneutron@gmail.com
really cool but you can remove speaker and make box for it :D but anyway good project
That looks realy cool.
its so cool...... can i have that...? how many money did you pind that...? did you have a facebook...?<br>
how many money did you spind.....?<br>
How many watts?
386's are half watt amplifiers. but they still put out a lot of juice, even tho it sounds small.
im new at this can anyone plzzzzz help me with the schematic
Hey these amps are really fun and quite easy to build. Here: http://www.instructables.com/id/Pocket-Protest-a-LM386-amp-in-a-9v-battery-casing/step2/Amp-Circuit/ is a good circuit for the 386. but be careful to add a 2200uF capacitor across the power and ground if you are going to run it off a wall wart. also the bigger the speaker the better sound you will get out of it. less gain more volume. Good luck, reply if you have any questions<br>

About This Instructable


679 favorites


More by krmartin3: Portable Speaker LM386 Audio Amplifier Full Spectrum Flashlight
Add instructable to: