Instructables

Portable - Mini Amplifier Speaker

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Picture of Portable - Mini Amplifier Speaker
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In this instructable, I will show you how to make a simple amplifier speaker with common components, it's not just simple but portable. It uses LM386N IC which is a low voltage audio power amplifier. When the project is finished you will have a working simple circuit that can connect with any device as an input, such as Ipod, MP3 player, even your laptop and PC.

This is the video of my portable amplifier speaker
(change the quality for a better view)



The sound quality of this circuit is pretty good.


OK, lets get started!
 
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Step 1: Parts and tools

Picture of Parts and tools
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Here is all you will need:
- (1) Small drug case
- (1) Perfboard
- (1) IC LM 386
- (1) 8 Pin DIP IC Socket
- (1) 3.5mm stereo jack female
- (2) 3.5mm stereo jack male
- (1) Potensio 5K
- (1) Potensio 1K
- (2) Potensio Knob (optional)
- (1) Resistor 10 Ohm
- (2) Ceramic Capacitor 0,01uF
- (1) Electrolit Capacitor 100uF
- (1) Electrolit Capacitor 220uF
- (1) Speaker 8 Ohm (0,5 - 0,6 watt)
- (1) 9 V battery
- (1) 9 V battery Clip
- (1) On-off Switch
- Shrink tubing
- Jumper wire
- Rainbow wire (optional)
- Male header extended (optional)
- Blackhousing / female 1x1 header (optional)

Tools:
- Soldering iron
- Solder
- Hot glue
- Mini drill
- Pliers
- Cutter
- Helping hands (if you don't have it, you can build it from my helping hands instructable)

Step 2: Making the circuit on breadboard

Picture of Making the circuit on breadboard
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First, lets put the components on a breadboard so we could see how it worked and how to fit it onto the perfboard. The circuit diagram was made with Fritzing.

The schematic was made with Altium Designer.

Test everything out and make sure that you're circuit is going to work before you start soldering.

Greetings from Indonesia too, I think i'll to make one based on your schematics and hook it up with the VU meter. Keep up the good work. PS i knew directly that you are from Indonesia from the battery, lol.

faziefazie (author)  moimoipalamoi6 days ago

Hahahaha... I used ABC battery on purpose. LOL

aalejo2 months ago

my can use your schematic for a wile? because i use in my instuctable.

faziefazie (author)  aalejo1 month ago
of course, it's okay :)
aalejo2 months ago

i make the circuits its fine and loud and i mod much more i put some poly caps for the gain i use that .47uf and i put 1000 uf 16v for the ground i put 470 30 v instead of 100uf and i try 10kpot it sure enough its more clean for the gain and but icant understand why circuit my self as i said its pretty clear now but i want i question that when the bass comes its lot zzzzz sound i try to put 8 ohms 4watts speaker that has great suspension for the bass its not loud and start much more distortion and when i try the same rate of speaker but!!!!!!! but no suspension for the bass boost its loud and comes out that part from a radio system and its new but got the lots of the that noise when my bass drops it could be to the power rates i use 1000mah 5v charger for psu section and i try more amps but it has a lot of distortion coming it how i really clean the sound i wants its perfect it but kind of driving me crazy how i really clean the my amp pls help i

faziefazie (author)  aalejo2 months ago

I'm really sorry for not understand the point of you questions. I can't understand your english because there's no coma (,) or period (.) even a question mark (?) on your statement. So I'm not sure to answer your question. Sorry...

aalejo faziefazie2 months ago

sorry for that im not good in language sorry for that!!!! ok my work the circuit its get a distortion when its in full volume but i try to modifi your circuit and schematic. to make it not to got a lot of distortion when its in full volume.so in gain i put a .47non polarized cap a polypropylene to make it good its been kind a different its self so the circuit has a treble boost .!!!!!! and when you adjust it !!!! in hi pitch the speaker has no distortion at all !!!. and when the bass drops!!!! now they have no distortion also its a now perfect !!!!! :) and second to make the signal in input in the jack itself. is now been good , and in control volume now got even if you, try it in full volume its got a pitch perfect ,no distortion, hi volume

faziefazie (author)  aalejo2 months ago

Ohh that's good job, my circuit still developing too. Can you share your schematic that already modified? It will be nice if you can share your awesome work, so people can learn from your circuit and make better than mine.

aalejo faziefazie2 months ago

yeah sure but i can picture my work because the truth of it i dont take my own schematic. but if you lend me a time because the documentation of my work is been not recorded if you lend me a week after my midterm exam ill . will give my schematic but for a while show my work . you will i have a adapter compatible and thats my mp3 my mod one if lend me a few moments!!!

i clone my work ill show to how i make its stereo sound

DC060101092539.jpgDC060101092737.jpgDC060101092833.jpgDC060101092859.jpg
faziefazie (author)  aalejo2 months ago

Wow good work! it's okay no problem, take your time. We'll be waiting for your update here with the schematic. Good luck for your midterm exams :)

aalejo faziefazie2 months ago

thanks for that. but i experiment more of the circuits and. i try Mylar cap!!!! its a big more louder than. my v1.0.0 so my Mylar caps rate is 0.01uf the one with ceramic caps.!!! i beg more different the circuits is so ... i will build new in stereo mode so ican make it more!!! next time and i make a instructables and im ready now to make one !!!! now this weekend

aalejo2 months ago

i make the circuits its fine and loud and i mod much more i put some poly caps for the gain i use that .47uf and i put 1000 uf 16v for the ground i put 470 30 v instead of 100uf and i try 10kpot it sure enough its more clean for the gain and but icant understand why circuit my self as i said its pretty clear now but i want i question that when the bass comes its lot zzzzz sound i try to put 8 ohms 4watts speaker that has great suspension for the bass its not loud and start much more distortion and when i try the same rate of speaker but!!!!!!! but no suspension for the bass boost its loud and comes out that part from a radio system and its new but got the lots of the that noise when my bass drops it could be to the power rates i use 1000mah 5v charger for psu section and i try more amps but it has a lot of distortion coming it how i really clean the sound i wants its perfect it but kind of driving me crazy how i really clean the my amp pls help i

anuraj3 months ago
I found a way to share the picture lol..... http://s27.postimg.org/mjut3r0ir/IMG_20140103_183748.jpg (as I said I'm new to this). :).... I forgot to mention in the previous comment, I dunno how but adding an LED took care of the static issue
faziefazie (author)  anuraj3 months ago
Wow that awesome!! You did a great job, congratulations for your own made speaker :)
anuraj3 months ago
Thanks a lot for the instructable... I'm new to this and after couple of burns while using a soldering iron lol.... But finally got it right.... I followed ur comment on using double of all components to n finally made my own... I miniaturised the circuit as much as possible ( after multiple failures though)..... I use it with a voltage adapter.... There is a very minute static otherwise working awesome. I wish there was an option to share pictures using the app...

http://www.instructables.com/files/deriv/F8B/B3RR/HPEG6A2A/F8BB3RRHPEG6A2A.SQUARE.jpg
Thank you! did up a speaker! Awesome beast! I love it
ngie
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faziefazie (author)  achua tarusenga3 months ago
Wow that's awesome! Good job for your own made speaker. congrats :)
aalejo4 months ago
can you pls answer me if a bought a lm386 chip but have no -n or something it will power rate will be more need power or not coz my circuit is fine my connection os fine exept of the caps that the negative sign is -arrow down i think i have problem
with that so please help for the troubleshooting
faziefazie (author)  aalejo4 months ago
I'm sorry for late reply, I'm being busy with my final project at college.

I think it's okay, you can use your LM386 chip. And no need more power. Or could you please send me picture of your circuit? So I can check and troubleshoot.
xzxcx4 months ago
Thanks for detailed... Biar bisa 6watt apa yg hrus dirubah/ganti/tambah... Heueu...
faziefazie (author)  xzxcx4 months ago
6 watt apanya ya?
xzxcx4 months ago
Nice work kang... Been test this, The volume output are small, how to make it loud? Your video are just great & loud. Sorry blepotan. Heuheu.
faziefazie (author)  xzxcx4 months ago
Jangan panggil kang, saya perempuan kok hahahaha

potensio nya pake yg berapa kilo? speakernya ada yg lain? kadang bisa jadi karena speakernya yg lemah.
xzxcx faziefazie4 months ago
Wdew, teh.. mangap.... :D.. ga liat detail cuma liat thumbnail pp :D...
potensia 1k. perlu experiment ulang nih. wirenya udah pada pendek pula kena potong terus :D. maklum lg belajar :)
faziefazie (author)  xzxcx4 months ago
iya gpp udah biasa kok, kebanyakan emang gak pada liat detailnya hahahaha...

sebelumnya udah dirangkai di protoboard dulu blm? kalo di protoboard lebih gampang trouble shooting nya, ganti2 komponennya juga. dari banyak rangkaian amplifier, rangkaian ini yang paling berhasil saya terapkan dan menghasilkan suara yg lumayan kenceng buat saya. kalo komponen nya udah ngikutin persis, bisa jadi problem di wiring nya tuh. coba diganti sama kabel2 jumpernya yg bener jangan yg udah pendek2. hehehe
cobaltcrew2435 months ago
does it matter what power rating you use for your resistors?
faziefazie (author)  cobaltcrew2435 months ago
I don't recommend for power above 9v, all the components that I used already calculated for power about 9v.
Liam.great989 months ago
Can I use film capacitors instead of ceramic capacitors? Seeing as they are the same capacitance and non polarized, I don't know how it couldn't work...
actually using film capacitors might solve your high volume problemm.....for any audio signal path it is always advisable to use film capacitors cuz ceramic some time acts as microphone and picks up ambient noises
faziefazie (author)  Liam.great989 months ago
you mean this film capacitor? yes, you can use them.
film cap.jpg
trustmobile8 months ago
Thanks.
ori788 months ago
I see, thank you soo much :D, but do you see a need to make the project stereo?
ori788 months ago
I really like this project, and I look forward to building it, But by looking at the circuit schematics I don't see a way to make this project stereo. Although, I am new with electronics so I know very little in this area. Elseways, Is there any modification I can make to change this project to stereo?
faziefazie (author)  ori788 months ago
To make it into stereo is just stack 2 side by side. that's means you need 2 LM386 IC, 2 speakers and doubled the other components. But maybe there are a little different for the circuit schematic.
Liam.great988 months ago
Something VERY strange just happened while using this. I heard static so I paused the music, then I heard it more clearly. If I unplug my iPod but leave the cord plugged in, I can pick up radio very clearly in certain parts of my house. Clear enough that my iPod can identify the song they're playing with an app called soundhound. If I hold the cord up in the air, the signal is strong enough that I could pass it by as an actual radio.
faziefazie (author)  Liam.great988 months ago
have you check the components and the wiring? because this is never happened to me. My circuit still in the good performance.
Adjusting the gain makes it less clear though
Liam.great989 months ago
This has won the "summer project award" by me. I will be making it soon and let you know how it turns out!
faziefazie (author)  Liam.great989 months ago
Great, tell me how it goes :)
Couldn't have gone better. It is really an inexpensive circuit yet it works great. I think people that pay for things like these are wasting their money to be honest with ya. Anyone can make this and it's satisfying to use something you made yourself. Only thing I find is that if I crank the volume on my iPod, the circuit shuts off. Do you find this?
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