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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.
 
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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





Step 2: Place Components

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Arrange components the best you can using the wiring diagram. i placed them as close together as i could, but it may be easier to spread them out a little more or breadboard this circuit first.  I highly suggest breadboarding first just to get a feel of the arrangement, prior to soldering.

Step 3: Observe Diagram

Picture of Observe Diagram
Look through the wiring diagram to see what components need to be connected to what prior to soldering.  This is a basic wiring diagram, one of a hundred I found online, very basic. The one i used was from this website http://www.rason.org/Projects/icamps/icamps.htm.

Step 4: Solder Components

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Solder components carefully to ensure there are no shorts, also ensure all connections are made at all points.

Step 5: Clean Up and Test

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Trim component leads and clean solder joints. Be sure to double check connections to make sure a connection isn't left out.  Hook up a 5-15 Volt DC power supply, your audio source, and 8 Ohm speaker and test it out.  Be sure to ground out the audio sources audio low line and ground out the speakers ground wire to the circuits ground.
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nils_pan5 days 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...

diygeek0076 days ago

pretty simple circuit.good instructable. thank you :)

asimobot13 days 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!

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 mystify6 months ago

where is the pot in the circuit?

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

16401012414 months ago
ricardov14 months ago

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

apuzari5 months ago
Worked like a charm!!!
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shekzz.rock5 months ago
Can I connect 2 8 ohms 3 watts speaker to dis amp..?
erik4045 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 erik4045 months ago

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

gpfanatic6 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

ktomar11 year ago
Which volts capasitors used in this.. ?
gpfanatic ktomar16 months ago

16 V works fine

Any capacitors with larger volts that power source voltage.

Cruzer_AU made it!6 months ago

Worked Great!

Now to make a PCB.

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gpfanatic7 months ago

The TDA2002. Look at the jackets. You can connect anywhere

ampTDA2002.jpg

if i had an ipod how would you connect it to this amplifier?

You should find a jacket and audio wire with adapter. I have used jacked for in and out. You should find It to electronic workshop

gpfanatic7 months ago

I have done third projec in rason.org projectst. My LM383 was broken so I
have gone for TDA 2002 and It is works perfect, it is equivalent. So I
have got 7 W for speaker. The LM383 works fine for low power. If you
look data sheet you see the high distortion for 1W, but TDA 2002 works
fine even for 5-6W. In add remember LM383 is obsolete

Excuse error: LM386 make distortion for 1W

JohnB78 months 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

lau14062 years ago
sorry for my bad English.

I have exedently switchet c2 and c3 but it works. do I have to switch them back or not becouse it works?

As long as it works

If I want to provide an input using mic and amplify my voice, how would I connect?

Late I know. Here's the easiest way.

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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?
Do you have a video on how to make this amplifier
tealk2 years ago
hey men, can i use 50k potentiometer?
Lee_Smith2 years ago
do you know if you could tie the two audio lines to the same pot otherwise if i was to make a breakout from a regular headphone jack with two audio lines there would need to be two pots that would increase or decrease volume for each line.
Hey is it possible to use CMOS Op-Amp like CA3130E instead of LM386?
Bulantuy2 years ago
help me to figure it out what is the problem on my amp because it dont work
how would ground be connected , im not used to seeing it in dc schematics. please explain.
musick_082 years ago
I need some help, does it matter what wattage the resistors are and what voltage the capacitors are?
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