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pam8403 6w stereo amplifier tutorial

by:Mingfa Tech     2020-04-16
This instruction manual will guide you through the steps of using pam 8403 Class d dc stereo amplifier.
This tiny amplifier works on a 5 v DC to produce an output of 6 w (2 X 3 W ).
This is one of the cheapest and most powerful stereo amplifiers with the right lines and power supplies.
The IC does not require a radiator, so this is perfect for your custom speaker project.
The amplifier costs about 80 cents in the United States.
About 50 rupees in India.
The size of this board is only 2 cm x 2 cm! ! !
Do not shorten the left and right audio output site without using
If you want to get what you have in common with making a headphone amp, there will be a schematic diagram below.
Avoid providing more than 6 volts.
I would definitely not recommend you to build this on the breadboard, the rate of authenticity is terrible! ! ! USE CO-
Axial cable for DC input and audio input.
If this is not done, it will result in terrible RF interference and BAAAD audio output.
There are two versions of the amplifier board, one with volume control and one without volume control.
Here\'s a schematic to add your own volume control.
Each connection label is basically printed on the motherboard, so you don\'t need to connect through rocket science.
Anyway, as I mentioned earlier, the input uses a shielded cable.
The output can be wired normally.
Find an auxiliary cable or any cable with a male stereo pin.
Note: Shorten the grounding and voltage of the audio input. You will find that there are three wires in the basic auxiliary cable, two of which are the signal lines, one is the ground wire, and usually the black or yellow wires are grounded.
If you don\'t know which wire to connect to which wire: 1)
Get the multimeter and switch it to continuous mode 2)
Connect one cable of MM to the bottom lead of the pin and the other cable to any line 3)
If you hear a beep, then that means the two terminals are connected to each other. 4)
Do the same for signal pins.
Anyway, you can swap the left and right signal input, which has no effect on the circuit.
Weld the wires to their respective pads.
In this case, there will be four wires, two for signals, one for grounding and one for ve voltage In, which is basically a built-in microphone for headphones/headphones
All you need is a signal and a ground pin.
Okay, you\'ll see four wires, ve V ,-Ve V, Data -
Ve and Data ve.
All you need is ve and-ve V wires.
Weld them to the corresponding pads on the board.
You will usually find the aluminum shield under the first plastic layer, peel it off, and then you will find that there are aluminum wires around the wires of the four colors, and also peel them off.
This amp can drive any speaker!
In my test, I attached it to two inch subwoofer with a rated power of 8 ohm 100 W.
But yes, it won\'t spit out its peak output power and you won\'t be happy with it if you use a huge speaker! . . .
Therefore, the speakers matching this amplifier are: any fr rated 4-
Any other speaker with 8 ohm 10 watt or impedance 4-
8 ohms, power 10 watts. . .
The best results can be achieved with a 4 Ohm 3 watt speaker.
Note: Do not shorten the grounding of the Speaker, this will damage the IC.
Follow the circuit below to achieve common ground 1)
Obtain a 10 k Ohm audio conical stereo potentiometer (
To put it simply, two potentiometer with a single knob produces the same output)2)
Connect the left output to the top left pin of pot3)
Connect the negative pole of the 10 uf electrolytic cover to the top middle pin of the pan and connect the positive pole of the cover to the left side input of the amplifier. 4)
Connect the top right pin of the pan to the ground of the amplifier. 5)
Connect the right side output to the bottom left pin of pot6)
Connect the negative pole of the 10 uf electrolytic cover to the lower middle pin of the pan and connect the positive pole of the cover to the right input of the amplifier. 7)
Connect the bottom right pin of the pan to the ground note of the amplifier: in the schematic, there are two potentiometer, do not confuse, it is the stereo potentiometer depicting (2 in 1 Pot ).
If you are looking forward to doing a headphone amplifier and can\'t short the ground pin of the output directly, please follow the circuit above.
Connecting the power supply before connecting the audio cable, it is normal to hear a slight hum from the speaker.
Connect the audio cable and the hum should be gone now. That\'s it! ! !
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