PAM8403 6W STEREO AMPLIFIER TUTORIAL

43,390

49

48

Introduction: PAM8403 6W STEREO AMPLIFIER TUTORIAL

About: A 16-year old who aspires to be one of the finest entrepreneurs in this huge world. Passionate about electronics,dance,music and set in to turn my hobbies into my profession! Wish me luck :D

This instructable will guide you through the steps of using the PAM8403 CLASS D DC STEREO AMPLIFIER.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: BASICS

THIS TINY AMPLIFIER OPERATES ON 5V DC AND PRODUCES AN OUTPUT OF 6W ( 2 X 3 W ) .

This is one of the cheapest and most powerful stereo amplifier, provided with proper wiring and power sources.

The IC does not require a heat sink, so this will be perfect for your custom speaker project.

This amplifier costs about 80 cents in the U.S and around 50 Rupees in India.

The dimension of this board is 2cm x 2cm only !!!

DON'T SHORT THE GROUNDS OF THE LEFT AND RIGHT AUDIO OUTPUTS WITHOUT USING A . There will be a schematic below if you want to attain common ground for making headphone amps.

AVOID PROVIDING MORE THAN 6 Volts.

I WILL DEFINITELY NOT RECOMMEND YOU TO BUILD THIS ON A BREADBOARD, THE DISTORTION RATES ARE HORRIBLE !!!

USE CO-AXIAL CABLES FOR THE DC INPUT AND AUDIO INPUT. FAILING TO DO SO WILL RESULT IN HORRIBLE RF INTERFERENCE AND BAAAD AUDIO OUTPUT.

THE AMPLIFIER BOARD COMES IN TWO VERSIONS, ONE WITH VOLUME CONTROL AND ONE WITHOUT. There's a schematic below to add your own volume control.

Step 2: THE CONNECTION

The board basically has every connection labels imprinted so you don't need to go through rocket science for the connections.

Anyways, as i had mentioned earlier, use a shielded cable for the inputs. Normal wiring can be done for the outputs.

Find yourself a aux cable or any cable with a male stereo pin.

NOTE : SHORT THE GROUNDS OF THE AUDIO INPUT AND THE VOLTAGE IN

Step 3: FOR TRS PINS ( 3 Leads)

You will find three wires in basic aux cables, two of them are signal wires and one is the ground, usually the black or yellow wire is the ground.

IF YOU DON'T KNOW WHICH WIRE IS CONNECTED TO WHICH LEAD:

1) GET A MULTIMETER AND SWITCH IT TO CONTINUITY MODE

2) Connect one cable of the MM to the bottom lead of the pin and the other cable to any wire

3) IF you hear a beep then it means that those two terminals are connected to each other.

4) Do the same for the signal pins. Anyways you can interchange left and right signal inputs, it doesn't make any difference to the circuit.

SOLDER THE WIRES TO THEIR RESPECTIVE PADS.

Step 4: FOR TRRS PINS ( 4 Leads)

In this case, there will be four wires, two for signal, one for ground and one for +ve voltage in, this wires is basically for the inbuilt microphone of your earphones/headphones.

You will require only the SIGNAL AND GROUND PINS.

Step 5: THE USB CABLE

Ok so you will see four wires, +ve V, -Ve V, Data -ve and Data +ve .

You need only the +ve and -ve V wires.

Solder them to onto the respective pads on the board.

You will usually find aluminum shielding below the first plastic layer, strip that off, then you will find aluminum wires surrounding the four colored wires,, strip them off too.

Step 6: CONNECT YOUR SPEAKERS

This amplifier is capable of driving any speaker! In my test i had it connected to two 8 Inch subwoofers rated 8ohms 100Watts each. But yeah, it won't be spitting out it's peak output power and you won't be satisfied with it if you use huge speakers! ...

SO THE SPEAKERS TO GO WITH THIS AMPLIFIER IS :
Any FRS rated 4- 8 ohms 10 Watts

or any other speaker with an impedance of 4-8ohms and 10watts power...

BEST RESULTS CAN BE ATTAINED USING 4 Ohms 3 Watts speakers.

NOTE : DON'T SHORT THE GROUNDS OF THE SPEAKERS, THIS WILL DAMAGE THE IC. FOLLOW THE CIRCUIT BELOW TO ATTAIN COMMON GROUND

Step 7: VOLUME CONTROL

1) Get a 10 K ohms Audio taper stereo potentiometer ( in simple words, two potentiometers with single knob resulting in same output)

2) Connect the left output to the top left pin of the pot

3) Connect the negative of a 10 uf electrolytic cap to the top middle pin of the pot and connect the positive of the cap to the amplifier's left input.

4) Connect the top right pin of the pot to the amplifier's ground.

5) Connect the right output to the lower left pin of the pot

6) Connect the negative of a 10 uf electrolytic cap to the lower middle pin of the pot and connect the positive of the cap to the amplifier's right input.

7) Connect the lower right pin of the pot to the amplifier's ground

NOTE: IN THE SCHEMATIC, THERE ARE TWO POTENTIOMETERS , DON'T GET CONFUSED, IT's TO DEPICT THE STEREO POTENTIOMETER ( 2 in 1 Pot ) .

Step 8: COMMON GROUND

IF you are looking forward to make a headphone amplifier, you can't directly short the ground pins of the output, please follow the above circuit.

Step 9: TEST IT OUT

Connect the power supply

It's normal to hear slight humming from your speakers before connecting your audio cable.

Connect your audio cable, now the humming should have disappeared.

That's it!!! Play your track and comment below if you have any issues with the amplifier and i will try solving it :D

Thanks and stay tuned :D

2 People Made This Project!

Recommendations

  • Tiny Speed Challenge

    Tiny Speed Challenge
  • Clocks Contest

    Clocks Contest
  • PCB Design Challenge

    PCB Design Challenge

48 Discussions

0
abstruseharmonic
abstruseharmonic

Question 1 year ago

I can connect only one speaker on only one left/right output, right?
Both points need not be filled, do they?

0
donutboy333
donutboy333

Answer 7 days ago

no

1
KenC155
KenC155

Question 3 months ago on Introduction

Hi, I’ve bought 5 PAM8043 boards from China, sorry for my ignorance but on wiring the input I’m bamboozled by the L.G.B. And how to connect (as per attached image. ). Can you advise what LGB means please? I’ve scoured internet and various forums but failed.

615AE366-2C27-41D7-A233-2A3D0091CDE7.jpeg
0
donutboy333
donutboy333

Answer 7 days ago

I think the B is a typo. It is supposed to be an R. The markings would be Left, Ground, Right.

0
OTM999
OTM999

Answer 2 months ago

Maybe L are Left , G are Ground and B are Right but im not sure you can try.

0
KenC155
KenC155

Reply 8 weeks ago

Many thanks, I’m going to give that a go.

0
skeatzy
skeatzy

Answer 3 months ago

I believe you meant LGR - left channel, ground & right channel inputs.

0
KenC155
KenC155

Reply 3 months ago

Many thanks. The board had LGB. But I thought it might mean LGR.

1
shafin.11.11.2002
shafin.11.11.2002

Answer 3 months ago

I think they meant LGR, which means Left, Ground and Right.

0
KenC155
KenC155

Reply 3 months ago

Many thanks. I thought as much, will tinker with that. K

0
TinglerAP
TinglerAP

8 months ago on Step 5

I have to pam8403 amplifiers and 4 speakers. I've connected 2 speakers to each board. When I connect the left, right and (t) of both the boards to get her with the help of a aux pin, only the left speakers of both the boards work while the right ones remain silent. But when i connect only 1 board with the aux, the left and right speakers of that board works. I cannot get the problem behind this. Please solve my problem.

0
BettingR
BettingR

Reply 4 months ago

U can looping ..wire...

0
LaxmanK13
LaxmanK13

Question 8 months ago on Step 1

How to connect valume button

0
BettingR
BettingR

Answer 4 months ago

Audio input ...left and right near

0
Qasim ali g
Qasim ali g

6 months ago on Introduction

Sir Mara Pam 8403 ic circuit heat hota hai is ka kya solution hai

0
BettingR
BettingR

Reply 4 months ago

Brother kuchh problem nehi...
Itna jaldi kharap nehi hoga

1
jeffrey77x
jeffrey77x

Question 6 months ago on Step 9

My name is jeff, I have a few questions. 1. What do you mean when you use the word pot 2.what is a 10uf electrolytic cap and where can I get this from and any other parts I may need. I do have 5 PAM8403 just need the other parts. You probably realize I am a novice when it comes to electronics. I do this as a hobby and are really enjoying it. Thanks

0
BigBadHodad
BigBadHodad

Answer 5 months ago

Pot is potentiometer, just means a dial thing like a volume knob as for the capacitors, you can get kits on amazon, ads fruit or even wish.

0
francisdumas
francisdumas

Answer 6 months ago

Hi,
A pot is a potentiometer, they come I many different configurations. What you need for a stereo amplifier is a stereo pot or you may use one pot per channel to have some sort of balance control. Now there is the resistance that you need to decide. Suggested here is 10k (10 khoms) meaning that the rotation of the knob will give you a resistance from 0 to 10k. 50k would work too, reading on the subject would tell you the pros and the cons. Now for volume control you want a logarithmic scale as opposed to a linear scale since our brains perceive sound pressure in a logarithmic way (decibels). Linear scale would work too but makes it harder to fine tune the volume as well as other cons.

Electrolytic capacitors are easy to find, open any old electronics and you might find 10uF caps you can salvage. Or you can search eBay, Amazon, mouser, DigiKey, for 10 uF electrolytic capacitors. Any low voltage will work since it’s for line in which are maximum 2 volts. So a 10 uF 16v would be perfect. They come in different shape, you will want “through hole” shape as opposed to a “smd” or “on board” shape.

One last suggestion is to type any questions you have in google and very often you will find your answer right away.

1
FarihaK3
FarihaK3

12 months ago

It works fine with 80% volume but when i turn my phone's volume to 100%, the bass mixes up with sound and audio is very noisy. What should i do? i am using it with usb powered charger with 2.1Ampere of output current with 5V.