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Class D Switching Power Amplifiers and Power D/A conversion

Increasing power of PAM8403 3W+3W amplifier board
Increasing power of PAM8403 3W+3W amplifier board
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Old 30th January 2015, 11:44 PM   #1
Wilfrid is offline Wilfrid  France
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Smile Increasing power of PAM8403 3W+3W amplifier board

Amplifier board is 3W + 3W PAM8403 (datasheet) class D.
I've a few speakers 4Ohms 5W
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As I'm not familiar with class D.
So to have more power in a large place, not to have something very loud but having a good repartition, can I:
- Use 1 amplifier, left + right to the same speaker, and so using a second amplifier left + right for a second speaker? By simply soldering left and right input together.
- Or using 4 speakers (Parallel? Serial?) and doing the same bridge mixing L+R outputs.
- Or do I have to use 2 amplifier boards and 4 speakers, but wiring from left to left and right to right, (so in my case having a certain lenght of wiring which seems not to be too good)... and adding 2 lefts input together, and 2 right inputs together.
...And to go further, can I use 8 or 16 speakers connected to 4? 8? PAM8403 to have a nice repartition of sound in a large place.
Any professionnal suggestion is welcome, and I hope you'll understand my french accent
After that a little operation on how to multiply and add all these Watts, Volts, and Ohms is also welcome to choose my 5V DC power In
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Old 31st January 2015, 11:00 AM   #2
Dinithm is offline Dinithm  Sri Lanka
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Old 31st January 2015, 11:22 AM   #3
abraxalito is offline abraxalito  United Kingdom
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Since these little puppies are so cheap on Taobao (1.2rmb or around $0.20) I've also given the issue of increasing the power some thought. I only came up with using output transformers. Your output power is limited by the voltage swing, so you need a trafo to step-up the voltage. If you wind your own trafo you can dedicate a primary winding to each amp, then choose the appropriate number of secondary turns. So for example with 4 primary windings each driven by an amp you could arrange the secondary to deliver 12W (minus a small loss due to the trafo's resistance).
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Old 1st February 2015, 02:10 PM   #4
Wilfrid is offline Wilfrid  France
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Thank you for the answer... And this nice drawing that makes things very clear.
I'm gonna try it like this.
This means:
- No problem to split the input and send it to that many devices?
- No problem to bridge Right and Left input on each PAM8403?
(Because people say that it's not something good on a class D amplifier)
- Each PCB PAM8403 becomes here a mono amplifier?
- Speakers stay in 4 Ohms?
- DC supply to use in this case should be 5V / 36W ?
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Old 1st February 2015, 02:26 PM   #5
lutkeveld is offline lutkeveld
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No you can't bridge them, you can parallel them. Bundle left and right respectively and connect them to the speaker. Then you have one channel that can deliver 6W in 2 ohm.

Supply can be 5V 1.25A (6,25W).
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Old 1st February 2015, 02:57 PM   #6
counter culture is offline counter culture  United States
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You could use them in an active speaker system. Biamping or triamping. This radically increases the effective power, 2*3W amplifiers can have an effective power of 12W if used for biamping. Or maybe drive a line array?
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