Picture of Portable - Mini Amplifier Speaker
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
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)

- 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
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.
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pranshu1213 days ago

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

Rits123415 days ago

can you say how to do on PCB Board

EL MONSTRO28 days 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!?.

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

Thanks in advance. :)
GanHamdi9 months ago

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

faziefazie (author)  GanHamdi9 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)  GanHamdi28 days 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.

yinkusben8 months ago
nice instructable...lemme go do it
faziefazie (author)  yinkusben1 month 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.rock1 month ago

You can read this instructables, he just made with two speaker based on my instructables here.

*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 is working.nice ckt diagram. very easy way.
faziefazie (author)  SKYuvraj1 month ago

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

ceironic5 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)  ceironic1 month 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

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)  rajamurugan1111 month 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.31 month ago

For me, it's only cost around $5. In Indonesia the components is quite cheap :) 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.version1 month 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.

jose159933 months ago

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

faziefazie (author)  jose159931 month ago

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

GururajS2 months ago

can we use 4ohms 3w speaker

faziefazie (author)  GururajS1 month 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.3991 month ago

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

GururajS2 months ago

can we use 4ohms 3w speaker

jose159933 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

jundi937 months ago

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

samalert jundi935 months ago

JeromeS5 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 JeromeS5 months ago

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

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

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

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

can i build the circuit without using Potensio 5K and Potensio 1K

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