Introduction: Make a Simple Audio Amplifier

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.

Step 2: Circuit Diagram

Picture of Circuit Diagram

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

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).

Step 7: 10 Ohm Resistor & 0.047 Capacitor

Picture of 10 Ohm Resistor & 0.047 Capacitor

6-Join the 5th pin of IC with one side of 10 ohm resistor, the other side of the resistor should be joined with the one pin of 0.047 capacitor. The second pin of the capacitor should be joined with the GND pin (4th pin of IC).

Step 8: Volume Controller

Picture of Volume Controller

7-Now again join the 5th pin of the IC with the +ve side of 220 micro farad, the -ve side of the pin should be attached with the A of the 100 ohm variable resistor.The B pin of the variable resistor should be connected to the GND pin (4th pin of IC).This becomes the Volume controller.

Step 9: Input and Output

Picture of Input and Output

8-Join the +ve pin of the 3.5mm stereo jack female with the C of the 100 ohm variable resistor.And the GND of the female jack should be attached with the GND of the IC (4th pin of IC).

9-Join the +ve of the 3.5 mm stereo jack male with the other side of the 0.01 capacitor and join the GND of the male jack with the GND of the IC.

Step 10: Testing

10- Last but not the least join the +Ve of 9V battery with the 6th pin of IC and -Ve of the battery with the 4th pin of IC.

Congratulation !!! you have made your own simple audio amplifier.

Now the time to check it out.Join the male jack with your mp3 player or musical instrument and female with the speakers.Now adjust the Volume and Gain to get the best and loudest possible sound.I should notify you that with this amplifier only one speaker will work.And do the adjustment from low to high.Do the adjustment carefully or it can damage your speakers.

You can change the input jacks as your requirement.You can add a 220 micro farad variable capacitor instead of simple 220 micro farad capacitor to change the bass.

ENJOY !!!!


reubenk8 (author)2017-09-20

please can I use anything equivalent to the lm IC?is hard getting one here. and also I need pictures of the capacitors showing clearly their writing so that I know them when I go for it.please send it to me on db on KWABENA REUBEN (ZENITH) .search it on fb please I need your help.

pikapie (author)2015-01-06

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!!

DaliopacP (author)pikapie2017-09-13

can you send the part list of the amplifier you made??
i was a student and i want to try how to make a amplifier??

gian.nanda.37 (author)pikapie2015-04-04

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

RohitS6 (author)pikapie2015-02-02

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 (author)RohitS62015-02-03

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!!

NAVANEETHS4 (author)2017-09-07

I need to make an amplifier for two 4 ohm 3 watt speakers to play audio from my phone.So what are the changes required

Thanks I made using LM386 and remove the distorted noise using mini transformer

AswanthA (author)2017-01-18

I went to an electronic shop and asked for the 5 kilo ohm variable resistor and 100 ohm variable resistor. I got somethings like this (Look at the images attached). Is it really the component needed for this project? Can I make this amplifier using that? Please. Someone help me out.

seal6000 (author)AswanthA2017-01-19

Yes those will work. The one on the right looks like it's a 22K though, it says it on the bottom of the metal can.

AswanthA (author)seal60002017-01-20

is 22K a problem? Can someone tell how to use this?

JohnG651 (author)AswanthA2017-08-24

It is best to use the 5K Ohm variable resistor. The 22K Ohm would work but is going to change the gain from the IC. Could be good; could be bad.

ND0859 (author)seal60002017-01-19

Can you help on below question
i have make an amplifier for below speakers, which components are required for this?

i have Total 5 speakers

two speaker(8 ohms 30 W) ,two speaker(4 ohms 3 W) & one speaker(15 ohms 3 W)

amiyaranjanbag (author)2017-07-13

Is component no.7 and 8 micro farad?

RahulN2 (author)2014-11-28

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

chilipepperdood (author)RahulN22017-06-25

I know this was 3 years ago and you've probably figured it out by now, but it looks like your ground (black negative terminal from 9V battery) isn't connected to anything.

Max3612 (author)2017-01-20

does anyone know if this will work for a 3.4 ohm car speaker

ND0859 (author)2017-01-13

i have make an amplifier for below speakers, which components are required for this?

i have Total 5 speakers

two speaker(8 ohms 30 W) ,two speaker(4 ohms 3 W) & one speaker(15 ohms 3 W)

MuneebR1 made it! (author)2015-06-04

Works fine!!!


FYK_E (author)MuneebR12016-08-31

How you connect to the speaker?

BALSEMIC0011 (author)FYK_E2016-12-27

either bypassing the female jack or getting a second male and connecting that to your speakers

kringyang (author)MuneebR12015-06-11

How many volts did you used in capacitor?

MuneebR1 (author)kringyang2015-06-11

50 volts in 0.01 & 0.047 micro farad capacitors
and 16 volts in 220 and 100 micro farad capacitors

Arshad Habib made it! (author)2016-12-21

i made it thank you its working fine

Arshad Habib made it! (author)2016-12-21

I made it thank you

JoséM244 (author)2016-11-30

Done! ?

PansiluJ (author)2016-10-24

I think this is the best and easy to make AMP.and great guidance.however i need to know how many watts of power this generate.and what kind of speakers that can i use?(i meant watts and ohms)

AshoK2 (author)2016-10-12

1.can I get overall gain with feedback=1000? can I possibly apply negative feedback?

RaviR47 made it! (author)2016-01-30

Thank u its working ver nice

FYK_E (author)RaviR472016-08-31

where your cable male plug in?

RichyS2 (author)2016-08-10

I made it by using 220uF and 100uF
Does that make a difference?
And the sound is very low. What can i do to increase the volume from.the speakers.
The potentiometer 100 ohm is full...
Please reply ASAP

katakatarrew (author)2016-06-28

How much is the cost of this amplifier?

lion2486 made it! (author)2016-06-23

Very nice and simple! Thank you. I burned one of my headphones already! :P

I couldn't find a potentiometer of 100Ω so I used a pot, but I need a screwdriver to adjust it.

George Willfoesaken (author)2016-06-13

can this circuit used to connect just normal speakers,say for 4ohm?

ZoyaL (author)2016-04-30

how are we supposed to provide 50 volts in 0.01 & 0.047 micro farad capacitors

and 16 volts in 220 and 100 micro farad capacitors????

och (author)ZoyaL2016-05-20

I know this is a late reply but I just read your question and thought that others might have the same question. When a capacitor shows 16v, 25v, 50v, 220v,etc... it is not telling you how much voltage you need to provide, that number indicates how much voltage is the capacitor capable of handling.

Here's a more detailed explanation:

SimonB112 (author)2016-05-10

how do I do if I want to do stereo, while having only one potentiometer for both channel Left and channel right (I did the circuit twice basically)

perveen (author)2015-07-15

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

PervinC (author)perveen2015-07-29

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

the awesomet (author)PervinC2016-03-26

I'm up for some diagrams for some big amps :D

Do you have skype?

a_krantz (author)the awesomet2016-04-14

y'all still got those big amp diagrams?

HarleyS11 (author)2016-04-06

Could someone please explain what each part is really doing for the circuit?
Im mostly confused as to what the 100uF capacitor and the 0.01uF Capacitor are doing.
can someone please help?

adityak58 (author)2016-02-04

i am trying to made it

MirsadM1 (author)2015-10-14

what is this male and female?

JoshuaB66 (author)MirsadM12015-11-22

Male is a penis and a female is a vagina.

Or, more detailed:

You have two components to connect something together.

the Plug (male) and the Jack (female). the Plug (for example your headphone Plug) plugs into the (audio) Jack (of your phone).

So, a Male is a Plug, and a Female is a Jack.

vishalm6 (author)2015-08-20

How to know a,b,c terminal of the potentiometer?

dinatale2012 (author)vishalm62015-09-16

grab a multi meter and test resistance between each terminal. The two outside leads should be A and C respectively and should have the full rated resistance of the potentiometer between the two. the one in the middle B should change in value of resistance when measured in comparison to terminal A. basically your measured resistance should move proportianally when you turn the knob. hope this helps

perveen (author)2015-07-15

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

PervinC (author)perveen2015-07-29

hie i dont think it works

BagusSadikin (author)2015-05-13

can you made a Distortion pedal from it by adding diode clipping on the output?
try it, maybe its working

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