Instructables

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.
 
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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).
JakeSteel made it!27 days ago

I enjoyed making this.

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

imadeit1.jpg
Ploae Ionut1 month ago

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

Dunne1111 year ago
How could you add a led and switch and maby a USB for an iPod?
vernkle Dunne1113 months ago

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.

usama200010 months ago
Hey can i use condenser microphone instead of input(3.5mm male) PLZZZZ tell me :(
vernkle usama20003 months ago

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

varun959 months ago
what class is this amplifier?(i mean class a,b,ab,d,g,h)
jdoeson10 months 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.
mitsof10 months 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.
faziefazie mitsof10 months ago
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?
PoLoMoTo1 year ago
Unfortunately this is a mono amp, stereo would require two LM386's
samaddon1 year ago
I HAVE A QUESTION !
Can i use a 1000 uF capacitor instead of a 220 uF capacitor to increase bass ??
samaddon1 year ago
I HAVE A QUESTION !
Can i use a 1000 uF capacitor instead of a 220 uF capacitor to increase bass ??
rgupta341 year 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 ,,,,, ????
Dowaine1 year ago
if i hooked up a mic to the spot labeled in would that work
shady241 year 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
that should work, but it may effect the volume and sound quality.
nedstark1 year 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
hey what electronic device carries the lm 386 chip? what other chip could i use instead and where to get it out of.......
Iif you want an amp with a bit more power go here I designed a quite powerful guitar amp using the TDA2030 on stripboard - there are soundsamples too it is quite simple and as per most of my designs I try to use parts I've salvaged, in this case most of the parts probably came from the same PCB as the TDA2030 - people were so impressed I had a few local players pay me to make them one.
Can I make multiple amps and join them together in series or parallel them?
nodoubtman1 year ago
5 k ohm Potentiometer not resistor
thanks! :)
sadilrox1 year ago
IS this suitable for 100watt speakers
djbogdy431 year ago
I REALLY NEED YOUR HELP!
In my town I can find only LM386N..It will work?
Yes you can use it! they are the same....
tom g.1 year ago
What is the wattage of the speaker that would match this set up?
tom g.1 year ago
Is the 10 ohms resistor 1/4w?
rush2sk81 year ago
can i use a potentiometer insted of a variable resistor
its the same thing! :)
bacha50671 year ago
Hey can anyone give me the circuit diagram for the.... the image is not so clear..
hrimiller2 years ago
Has anyone tried this with an ipod? i have a nano chromatic and it is really quiet with my headphones.
Hello everyone, I'm new to this website. I'm going to school for electronics so I will be on this site a lot. I'm also kind of a noob to everything as well so pardon me If I asked stupid questions.
I am trying to build something just like this for my class. My question is, what if I want to use a small 8 ohm 0.5 W speaker that has a red and black cable connected to it. Would I just replace the female 3.5 mm jack with this speaker?
Yes, indeed. You should connect the black to the ground and red to the signal +. I have read this chip is made to put out 0.7 Watts, so maybe you shouldn't put the amplifier on full power, or you can damage the speakers.
yes you would :)
does anyone know what voltage capacitors to install?
I'd choose 10v or higher. Just make sure it's higher than the 9v or it'll explode =D
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