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.

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.
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vishalm69 days ago
How to know a,b,c terminal of the potentiometer?
perveen1 month ago

also tell me how to know the variable ressistane which one is 5k ohm or 100ohm

PervinC perveen1 month ago

hey if you are so much into making amps lets link up i have some diagrams of big amps

perveen1 month ago

if i use a polarized capacitor on the place of 0.01 film capacitor will it work or not

PervinC perveen1 month ago

hie i dont think it works

MuneebR1 made it!2 months ago

Works fine!!!


How many volts did you used in capacitor?
50 volts in 0.01 & 0.047 micro farad capacitors
and 16 volts in 220 and 100 micro farad capacitors
BagusSadikin3 months ago
can you made a Distortion pedal from it by adding diode clipping on the output?
try it, maybe its working

Can i make multiple outputs with this? Thanks!

jozepapez106 months ago

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

this is a much different level of power needed! Thats gonna require more parts too, im no expert so i couldnt tell you specifically, but it would include the need for a fuse
pikapie7 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!!

hey dude does it work on an empty PCB like this ? because i don't know how to make printed one

RohitS6 pikapie6 months 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 RohitS66 months 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!!
KrishnenduM7 months ago

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

KrishnenduM7 months ago

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

RahulN29 months ago

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

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.

Dunne1112 years 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.


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

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

duckie1121 year 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 duckie1129 months ago

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

amanuale10 months ago

but how can use variable resistor?

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!

jordank112 months ago

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

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.


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

usama20002 years 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

varun952 years ago
what class is this amplifier?(i mean class a,b,ab,d,g,h)
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