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Picture of LM386 Audio Amplifier
I wanted to design an audio amplification circuit for a future project so i just wanted to design this one for now so i get an understanding of how it works. This is a very basic circuit that you can find all over using an LM386 integrated circuit i got from RadioShack.

Step 1: Obtain Parts

Picture of Obtain Parts
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All Components can be found at RadioShack.

Multipurpose PCB with 417 Holes
5-15 Volt DC power supply (4 AA or 1 9v Battery)
8 Ohm Speaker
Audio Source e.g. iPod
8-Pin Retention Contact
IC1    IC                           LM386 Audio Amp IC
R1     Resistor               10 Ohm
R2     Resistor               1K Ohm
R3     Potentiometer     10K Ohm
R4     Resistor               10 Ohm
C1     Capacitor             220 Micro Farad
C2     Capacitor             10 Micro Farad
C3     Capacitor             220 Micro Farad





 
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SamS602 days ago

wil this work if i have 2 8ohm speakers coming off of it

EliB28 days ago
Hey cant see what your 5th pin is connected to and cant view picture in previous comments
tortiz-potter made it!16 days ago
Easy circuit to put together, idk how the potentiometer works in the circuit, when I adjust it, nothing happens.The music gets distorted after half volume.
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rahilgada1 month ago
@krmartin Hi !Thanks for uploading this circuit. I tried making the same amplifier but I am facing problem the speaker doesn't give me sound. I m give giving an 12v 1Amp dc supply from adaptor,is that fine?
NoahH51 month ago

just a question not necessarily related to the topic, but if I needed to solder a left input, ground, and right input, what wire colors correspond to each if I have a black, red, and then the ground wire.?

ClaudeG2 months ago
Can i hook up a sub to the output?
BurakC ClaudeG1 month ago

Subs need higher amps than a small 8 ohm speaker so, probably you will get lower volume.

gsilviu2 months ago

Can I use it on a 16 ohm speaker?

BurakC gsilviu1 month ago

Yes, you can use 16 ohm but it will provide you 2 times less volume then 8 ohm.

SreehariM made it!3 months ago

There is one mistake in the above circuit diagram.

Pin 5 is missed out and that is causing a lot of noise problem.

Here is the corrected figure.

-Sree

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ClaudeG SreehariM2 months ago
I cant open the pic where is pin 5 connected to?
ClaudeG3 months ago
What should i do about pin 5 of the lm386 im hearing littke noise
SreehariM ClaudeG3 months ago

Yes that is causing all the noise problems.

I have uploaded the corrected circuit including the connection to pin 5.

-Sree

SreehariM3 months ago
JohnB71 year ago

Where is a good place to buy capacitors and resistors, every time I google the specs of a capacitor or resistor they all look way different

tclayton JohnB73 months ago
Look up "joe knows electronics" on amazon. He sells kits that have all standRd sizes of caps all labelled and organized in bags , saves all the shopping around
tclayton JohnB73 months ago
Look up "joe knows electronics" on amazon. He sells kits that have all standRd sizes of caps all labelled and organized in bags , saves all the shopping around
mgrandi2 made it!3 months ago

That's the best configuration I've worked out. It sounds nice!!

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mbenavides1 year ago
Just wondering but i got a lot of distortion with this amp, how did you clean it up?

Tantalum cap (10 - 22 uF) across the power rails. Watch polarity on the cap.

sladejas4 months ago

I built this and it works much better than the default version on the TI datasheet. If you are experiencing distortion on the output (either audible or noise on the O-scope), add decoupling caps to the power rails. A 10 - 22 uF tantalum cap from power to gnd (watch polarity of the cap) cleans up the signal very well . Try it if you are getting noise!

nils_pan4 months ago

hi krmartin, i made it and working fine in 3 volts 4.5 volts also, thanks .....

nils_pan4 months ago

hi krmartin, i made this but unfortunately not working, i haven't used R3 Potentiometer 10K Ohm bcoz due to sortage not available locally, can i skip it or use 10 var...

diygeek0074 months ago

pretty simple circuit.good instructable. thank you :)

asimobot5 months ago
Hey, im bout to build this and im new to this kind of thing. when u connect the power output how do u connect both negative and positive to one wire

Quick question, and hopefully not a stupid one. How do I connect the audio input to this circuit? What kind of cord should I use? I have tried using a 2-wire cord and grounded the black cord, using the red as the input. That gave me some sound with lots of garbage. I spliced a set of earbuds and have a red, black, and green wire. Would this work? Please somebody help!

Guysmiley862 years ago
hi I was wondering if this would work with 2 speakers for left and right or just the one speaker????? If it would work for 2 speakers does anything change or everything stay the same????? would really like the help.

You can do with single output. Take single output and attach to stereo jacket.

For audio wire

Left side - circuit: signal-signal twisted together and ground

Right side- jacket: signal to left pin, signal to right pin jacket and ground to ground pin of jacket

You need audio wire and stereo jacket, ask to electronics vendor what is the ground pin of the 3 the other 2 are indifferent signals

Build 2 circuits and input L & R to individual circuits each having their own speaker.

pbardolet1 year ago

I've built the amp, and the music can be heard through the speaker, but in a very low volume, like if it's not being amplificated. Can anyone help me with that? I don't know what's happening.

Thanks.

Adjust you input potentiometer.

vinu mystify11 months ago

where is the pot in the circuit?

its R3, but i dont think it is in his build

16401012419 months ago
ricardov19 months ago

Cool, it really works, but i have a doubt about the components and about calculating scaling, Could you help me?

apuzari9 months ago
Worked like a charm!!!
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shekzz.rock10 months ago
Can I connect 2 8 ohms 3 watts speaker to dis amp..?
erik40410 months ago

Is it possible to swap the speaker for a mono jack output and connect the circuit to a mixing desk or even a audio input on a soundcard?

gpfanatic erik40410 months ago

I think so. Important Rout of this circuit is low how should to be and Rin audio card is high as usual

gpfanatic10 months ago

In this project is lacking output impedence versus speaker inductive component. In parallel to speaker is needed a RC circuit to balance inductive component of speaker. If you need to understand more on audio amplifier ask for my electronics website in PM

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