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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

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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

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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.

Step 3: Move to Perfboard

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Step 1
Cut the perfboard about 2 cm x 7 cm.

Step 2
Create paths of the circuit using markers. (this step just for easier our work, and easier for troubleshooting the circuit)

Step 3
Arrange the component, I usually place all components in before starting to solder. But if you want to do soldering one by one,  you can mark on the perfboard which legs of your component will be placed. Like mine, I create a mark on some place to put a header for potensio, audio socket, and header for power source.

Step 4
Check the components once again before soldering.

Step 4: Complete the circuit on perfboard

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Step 1
- Pin 1 : connect to header male for potensio 5K (see image 3 or 4)
- Pin 2 : connect to one lead of ceramic cap 0,01uF, the other lead goes to positive audio socket.
- Pin 3 : connect to pin 4
- Pin 4 : connect to the ground | connect to negative lead of 100uF | connect to the one lead of ceramic cap 0,01uF and the other lead goes to resistor 10 Ohm. (see the protoboard picture)
- Pin 5 : connect to the other lead of 10 Ohm | connect to positive lead of 220uF
- Pin 6 : connect to 9V (positive) | connect to positive lead of 100uF
- Pin 8 : connect to header male for potensio 5K (see image 4)


Step 2
I'm using male header (extended) for potensio, power source, and for audio socket, so it will easy to modify with other value (specially for the potensio). But it's okay if you want to soldering right to the lead of the component.

# For Potensiometer

#POT 1K
* We need 3 header male (extended)
* Put the same size length of the leads for upper and down side.

>> Upper side
- Left : connect to the negative lead of 220uF,
- Center : connect to positive of speaker,
- Right : connect to ground and negative lead of speaker
>> Down side
- Left : connect to the potensio
- Center : connect to the potensio
- Right : connect to the potensio

#POT 5K
* We just need 2 header male (extended)
* Put the header upside down


Step 3
Soldering the components carefully.

Step 5: Adding the potensio

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#POT 1K

- Soldering the wire to 1st pin, 2nd pin, and 3rd pin.
- Use black housing / header female 1x1 to connecting with the header male on perfboard (later).
- This becomes the Volume Control

#POT 5K

- Join the 2nd & 3rd pin of potensio. (cut the wire somewhat longer, in order to unify the two pins). soldering carefully.
- Soldering the wire to 1st pin.
- Use black housing / header female 1x1 to connecting with the header male on perfboard (later).
- This becomes the GAIN


For the wire I usually use a rainbow wire, because it's thin, flexible, and easy to clip with the black housing.

Step 6: Add Stereo Jack Socket

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Step 1
- Join B & C pin, solder them together with small jumper wire
- Join A & D pin, solder them together with small jumper wire

Step 2
Soldering a wire between A & D that had been join.

Step 3
Soldering a wire to pin E (this is will be the ground)

Step 7: The Enclosure

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Step 1
Drawing the pattern on drug case with marker for placing the switch, stereo jack socket, speaker and potensiometer. It's really helps for drilling.

Step 2
Be careful when you drilling the drug case, because it made of plastic. It easy to melt if the drill get hot, but it's okay you can tidy it up by using a small cutter knife.

Step 3
There will be some scratch and some little cracks on the case, you can covering it with the colour paper or paint it.

Step 8: Put the circuit into enclosure

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Attention
We will work with a pretty small box, accuracy of arrangement between the circuits is necessary. Don't forget about the space for the battery, because this is portable, so we need internal power source for our circuit.

Step 1
I started with the easy part, it's a stereo jack socket. Drill the case carefully.

Step 2
Measuring the range between stereo jack socket and potensio with precisely, because it will be a problem if they stick too close. And also give the distance between two potensio for sure.

Step 3
Attach the switch and the speaker to the place that we drill before.

Step 4
After we attach the switch to the place, solder the first lead of switch with a wire (include the black housing) (see image 3)

Step 5
Solder the second lead of the switch with a positive wire from battery clip.

Step 9: Putting all together

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I put the battery on the bottom. Then the circuit on the top of it. But you can rearrange between the circuits, for the efficiency. I attach perfboard and the battery with 'Foam Double Sided Tape' instead of using hot glue, just in case I want to modify the circuit later. But if you want to make the circuit steady and permanent I recommend for using some hot glue.

Step 10: Modify as you want !!

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This is small, portable, but also have a limited ability to working. But it is not an obstacle to create something better. This circuit is easy to modified as it's so simple, and there are some ways to modify the instrument :

1. You can replace a battery with an external power source

2. You can change a potensio meter values to get different volume range.

3. You can add LED if you want. The led should turn on when the device is powered and the other function is LED will stop you forgetting to turn off the instrument. But don't forget to add a resistor.

4. You can add a 220 uF variable capacitor instead of simple 220 uF capacitor to change the bass

5. And then let your creativity flow!!

Don't forget to give me a feed back or advice because I'm just a beginner.


Have fun :D


Greetings from Indonesia!!
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it is ok if i use a MIC as a input device?

hi how about if i put it in outlet,220volt? what should i do? without using adapter.,.,

waqarqadir18 days ago

i ask u some thing that - Pin 6 : connect to 9V (positive) | connect to positive lead of 100uF | what dose it mean reply me plz

i must made this amplifire thank u and reply me plz

pranshu121 month ago

can i put 2 8ohm speaker in this circuit will audio level come down

Rits12341 month ago

can you say how to do on PCB Board

EL MONSTRO1 month ago
Hey there
Greetings from India ;-)


Actually I wanted to have some changes done
I was wondering if I could use 5v instead of 9v in the same circuit!?.

Also
Does the same circuit work for 4ohms 3watt speaker??

Thanks in advance. :)
GanHamdi10 months ago

gan nama lain IC LM 386 itu apaan sih gan soal.a saya mau beli tapi ga' tau nama.a

faziefazie (author)  GanHamdi10 months ago
sebutan lainnya JRC386, tp terkenalnya LM 386. Dan biasanya kalo mau nyari bilangnya ya IC LM 386.
kode 386 nya itu yg penting, soalnya beda kode bisa beda rangkaian di dalam IC nya. atau pas nyari bilang cari IC audio amplifier. kalo bisa yg ukuran dan skematiknya gak jauh beda dari LM 386.
gan saya minta intruksi yg bhs indo dong tp scra sederhana soal.x saya g' terlalu paham kelistrikan
faziefazie (author)  GanHamdi1 month ago

duh saya cewe, jngan manggil 'gan' hahaha...

instruksi yg mana? kalo diartiin dari awal maaf bgt saya gak ada waktu buat bikinnya, soalnya udah mulai sibuk kerja.

yinkusben9 months ago
nice instructable...lemme go do it
faziefazie (author)  yinkusben2 months ago

That's great, let me know if you finished it :)

shekzz.rock8 months ago
Can u please guide me how can I use 8 ohms 3 watts 2 speaker. Way differences will have to make to amp..
faziefazie (author)  shekzz.rock2 months ago

You can read this instructables, he just made with two speaker based on my instructables here. http://www.instructables.com/member/Kevin+Marshall/

*wat difference will have to make to amp..

how to recharge the battery when it in use

Are you using the rechargeable battery?

you can't recharge disposable battery, it could be explode.

SKYuvraj9 months ago
thankx.it is working.nice ckt diagram. very easy way.
faziefazie (author)  SKYuvraj2 months ago

I'm glad to know it's working, good job :)

ceironic6 months ago

I have a question. I havent started this yet but I'll be soon,but i wana power it from 9V transformator (DC) and want to have two speakers. Although I'm consirned that its not going to be loud enough, so I wanna ask what if I replaced the lm386 with TBA820M, and also what would i have to chang ein this circuit. thanks for answer, if ever

faziefazie (author)  ceironic2 months ago

The TBA820M is a 8 pin DIP, you will have the ripple
control and frequency compensation pin to worry about. and you'd have to do some work on the circuit
design.

I'm sorry I can't help you with the design, because I never use it before :(

can i build the circuit without using Potensio 5K and Potensio 1K , what happen if i do not use it

faziefazie (author)  rajamurugan1112 months ago

if you didn't use it, then you can't control volume and gain from your speaker.

how much is the approx estimate of all the components

faziefazie (author)  shreeyash.thorat.32 months ago

For me, it's only cost around $5. In Indonesia the components is quite cheap :)

hi...is it possible to change the power supply? instead of a 9v battery i want to use a 9volts AC to DC power supply...but first i need to know how many milliamphere that the speaker need... i hope you answer my question ^_^

faziefazie (author)  dhola.rock.version2 months ago

Hey, really sorry for my late reply. I've been on hiatus for awhile from this website for some reason.

Nine-volt batteries produce 400 to 500 milliampere-hours at 8 milliamperes. So you can use 9 volts AC to DC with around 500 mA.

jose159934 months ago

finally itz done n working all fine thx for the ckt buddy

faziefazie (author)  jose159932 months ago

wow that's great, I'm glad to know it's all working. Good job dude :)

GururajS3 months ago

can we use 4ohms 3w speaker

faziefazie (author)  GururajS2 months ago

I never use 4 ohms 3 watt speaker, but I think you can try it using my circuit design. but please try it first on the breadboard.

I want to use my Two 6 watt, 4 ohm speakers can anyone guide me how to make a portable speaker system and amplifier

faziefazie (author)  kartik.singh.3992 months ago

I think it's quite the same, you can build using my circuit, but please try it first on the breadboard.

GururajS3 months ago

can we use 4ohms 3w speaker

jose159934 months ago

dude i ve made the circuit and its working bt the audio s to low i dont knw wht mistake i ve made ne suggestions mine is a sony speaker with 3.2 ohms n 2.5 wattshelp me plz

jundi938 months ago

How can I connect an LED ? it would be great if you can show it on the breadboard :)

samalert jundi936 months ago

http://www.instructables.com/id/Portable-Speaker-1/

JeromeS6 months ago

can someone help me about this experiment?

would it still work if i dont use LM 386 chip because i dont have one of those?

is there other chip that i can use other than this?

samalert JeromeS6 months ago

Dude the amp is must. Else the volume will be so low that one needs to bring it near ears.

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