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Picture of Make a Simple Audio Amplifier
It is my first instructable.Lets see how to make an audio amplifier which you can use with any of your musical instruments like guitar,piano and with ipod and other devices.So Lets begin the journey....

Disclaimer: If following this guide anything damages i shall not be held responsible.Do it at your own risk.
 
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Step 1: Components

Picture of Components
You need the following components

1- LM 386 semiconductor (IC)
2- 100 micro Farad capacitor
3- 220 micro Farad capacitor
4- 10 ohm resistor
5- 5 kilo ohm variable resistor
6- 100 ohm variable resistor
7- 0.01 capacitor
8- 0.047 capacitor
9- Wires
10- 9V Battery clip
11- 9V Battery
12- 3.5mm stereo jack male
13- 3.5mm stereo jack female
14- Project board (or you can use dotted board and solder)

You can find these electrical components from your nearest electronics store.These all components are easy to find and are common so you won`t have a hard time to find it.

Step 2: Circuit Diagram

Picture of Circuit Diagram
schematic.jpg
The circuit which we are going to make is.

Thanks to cld000 for schematic drawing.

Step 3: Placing the IC

Picture of Placing the IC
1- Place the LM 386 in the project board as show in the image.

2-If you pick the IC in front of you (so you can read what is written on it) then the lower left pin is 1 and the pin number increase anticlockwise.Take a wire and join the 3rd pin to 4th pin(GND pin).

Step 4: 0.0.1 Capacitor

Picture of 0.0.1 Capacitor
Join the one pin of 0.01 capacitor with the 2nd pin of IC. The other pin of the capacitor should be joined with the INPUT.

Step 5: GAIN Controller

Picture of GAIN Controller
DSC00057.JPG
4-Now join the 1st pin of IC with the A pin of the 5 k ohm variable resistor.
Join th A pin of this variable resistor with the C pin.Lastly join the 8th pin of IC with the B of this variable resistor.This becomes the GAIN.

Step 6: 100 micro Farad Capacitor

Picture of 100 micro Farad Capacitor
5-Join the +ve side of the 100 micro Farad capacitor with 6th pin of the IC.The -ve of this capacitor should be joined with GND pin (4th pin of IC).
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jozepapez1027 days ago

Ok Guys can you guys help me out. I need sound amplifier for 12V Car battery. For two 250W speakers.

pikapie2 months ago
I used 2 LM386 chips and did mine on a pcb. At first the sound was soft and easily distorted. I then went to check out the data sheet for LM386 and realized this chip could take 18v max. So I dug around my box of old power bricks and settled for a 14v 3A one and I must say it sounds a million times better!!
image.jpg
RohitS6 pikapie1 month ago

Hey... I like your design... I have 2 speakers 6 ohms each... can you explain your components and your design in detail to me..? I want to make it at home.

Thank you in advance.

pikapie RohitS61 month ago
Haha what i did here is exactly the same as the instructions mentioned above. The only thing i did different was that i did mine on a PCB and added a few extra components which were then 2 connectors for the speakers, a female stereo 3.5mm audio jack and another connector for power. Since the Lm386 is a mono amp, i used 2 for stereo. I just did the same circuit twice on one PCB and shared the power between the two. The audio input for both circuits is combined into one female stereo 3.5mm audio jack for easy usage. I also bridged alot of connections using the snippings from the components (i try not to use wires) which makes for a nicer looking finished product. Thats pretty much it. Happy building!!
KrishnenduM2 months ago

Can I add a subwoofer to this.Please help me with the circut diagram.

KrishnenduM2 months ago

Can I add a subwoofer to this.Please help me with the circut diagram.

RahulN23 months ago

I have also made but it's not working, please help me.

IMG_20141129_035624.jpgIMG_20141129_035647.jpgIMG_20141129_035635.jpg
PoLoMoTo2 years ago
Unfortunately this is a mono amp, stereo would require two LM386's

That is actually an advantage for when you're building high fidelity speakers; it is much easier to avoid interference if you amplify each speaker separately.

Dunne1111 year ago
How could you add a led and switch and maby a USB for an iPod?

I wouldn't recommend attempting making a USB DAC, even the companies that sell them (iHome, Fiio, etc) buy them from someone else.

A small LED will work. WARNING LED MAY DAMAGE IF POLARITY (+/-) IS INCORRECT!!!

USB audio input may start to get complicated.I don't know if you may need drivers.

SUBHANKAR DAS11 months ago

0.01 capacitor
and 0.047 capacitor. i want to know is this polysterfilm cap??? and what is the voltage rating of this cap?

i think you are referring to the ceramic cap which is look like a brown tablet

duckie11210 months ago

Hi, I made a simple 3 transistor amplifier and removed 2 resistors wich was causing alot of noise. Removing those 2 made the sound very clear out of the 8ohm 7w speaker. The problem I'm having is that the speaker isn't very loud. Transistors I'm using: BC337, BC547 and BC327. Anyone know how to make the sound louder?

New 9v Amplifier.PNG
ocoler duckie1124 months ago

make another stage to increase your gain, and try to use darlington transistor

amanuale5 months ago

but how can use variable resistor?
randoman22111 months ago

Can i use a pcb (printed circuit board) instead of a breadboard? And one more question, where did you get that LM386?

just hook up two audio jacks the one you need a 9v then a varible resistor done!

jordank16 months ago

just hook up two audio jacks the one you need a 9v then a varible resistor done!

nourelsobky10 months ago
JakeSteel made it!1 year ago

I enjoyed making this.

The pictures were a bit too dark and out of focus to be helpful, though.

imadeit1.jpg

hey the pictures are not too clear can help me with other pictures please!!

usama20001 year ago
Hey can i use condenser microphone instead of input(3.5mm male) PLZZZZ tell me :(

You can try with a small $2.50 microphone from Radioshack.

can i connect this amplifier to my car audio system

I would suggest using a 5v regulator. Make sure your polarity (+/-) is correct.

You may also want to replace your speakers as they are built for 12v-14v and this amplifier is 5v. If you follow the first two steps then you shouldn't damage anything however, I'm not responsible for any damage

varun951 year ago
what class is this amplifier?(i mean class a,b,ab,d,g,h)
jdoeson1 year ago
The LM386 is a low voltage audio amplifier, so you're most likely to find it in other audio amplifying devices. Otherwise, it's a $2 chip from Radio Shack.
mitsof1 year ago
How are we supposed to turn that schematic to PCB?I am a beginer and cannot make much out of this schematic.I haven't the slightest idea how to turn schematics to pcb.Maybe you could enlighten us.
you can use 'Altium Designer' for making schematic and turn into PCB. it's quite easy to use.
Dunne1111 year ago
Would it work if you used 12v power supply instead of a 9v supply?
samaddon2 years ago
I HAVE A QUESTION !
Can i use a 1000 uF capacitor instead of a 220 uF capacitor to increase bass ??
samaddon2 years ago
I HAVE A QUESTION !
Can i use a 1000 uF capacitor instead of a 220 uF capacitor to increase bass ??
rgupta342 years ago
plzzzzzzzzzzz help me ........how to use those variable resistors??? and i have used 4k7 instead of 5 kilo ohm resistor ... is it ok ...
help me its not working ... i connected a jack from my guitar to input ...
its giving hisss sound only .... :(
i have used a guitar jack ,,,,, ????
Dowaine2 years ago
if i hooked up a mic to the spot labeled in would that work
shady242 years ago
hey i am almost on a verge of making this ....all i need to ask is that,can i use 10k ohm potentiometer insted of a 5k ohm potentiometer
vernkle shady242 years ago
that should work, but it may effect the volume and sound quality.
nedstark2 years ago
does my speakers have to have its own power supply, i mean, i want to use the speakers for pc, which of the two do i use? will i be okay if the detachable one? thanks
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