DIY Audio Projects Forum

PAM8403 - 3+3W D-amp
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Author:  Soundbrigade [ 06 Jan 2017, 10:28 ]
Post subject:  PAM8403 - 3+3W D-amp

Having read about the PAM8403 on a Swedish forum I decided to grab a bag from AliExpress and just recently got my ten stereoamps.

At the cost of a few bucks you get ten bare 3W stereo classD amplifier.boards. You have to add connectors, PSU and a chassis.
I got mine from here: AliExpress
Hooks up to a PSU or battery of 3-5V. When I ran my amp from a bench PSU I measured approx 11mA current, but I am not playing at max OP.

This is what they look like:

And once installed, running on 3,7V:

I've been plying my Elkie Brooks CDs all afternoon and I am pretty much satisfioed with the quality of sound. On occassions it may sound a bit harsh, but the last hours I haven't been disturbed by anything like that.

This module can go anywhere, toy synths, music boxes, stompboxes, guitar practicing amps or as a backup at home. I just dug up an iPod dock and a cast zinkbox that could make an iPod amp.

The major disadvantage is the size. Installed in a box, connectors, battery and volume pot will require lots of space.

Author:  Gio [ 08 Jan 2017, 12:08 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

US $1.69 / lot 10 pieces / lot , US $0.17 / piece

What a great price! At 17 cents, that works out to about 6 cents per stereo Watt!

These modules would be great for a wide variety of DIY projects as you mentioned. The 5V supply voltage can make these really handy around computers if it can work well will work from typical 5V USB supply.

Looks like tons of great inexpensive stuff on AliExpress. I may have to try ordering some stuff.


Author:  Soundbrigade [ 08 Jan 2017, 12:57 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

They are also available on eBay and elsewhere. Check for good prices. And as you can get 10 stereo amps at 2 dollars, it's pointless ordering ONE amp only.

I should stress that they sound OK. Been listening for a few days, mostly rock but some jazz and I am happy.

Ed. And I am VERY surprised that this hasn't appeared on the forum before. I can give it a thought to make a sort of Audio Project to be published in here, but I lack a good housing and I cannot find my battery holders (for the 18650 batterie).

Author:  Geek [ 08 Jan 2017, 20:52 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

IIRC, Elektor had an issue with this chip. Flexible is an understatement!

Author:  gofar99 [ 09 Jan 2017, 09:32 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

Hi, I have not tried these particular amps but ran into an issue with some others. I used them on a TV. Fed the speaker / headphone jack into them and then off to some speakers. Decent sound and all.......that is until the CATV guys showed up at the door. It seemed that the class D amps put out a lot of high frequency switching noise and containated the ground/shield of the CATV. It was sufficient to cause signal degradation on certain channels (ones I do look at) for a block around. When they hooked up the test gear here it was really clear how bad the contaimation was. Just be alert to the possibility.

Good listening

Author:  Soundbrigade [ 09 Jan 2017, 12:00 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

Hmmmm ... Arizona ... ??!! ... Didn't you wanted a referendum about free pot ...????!!!! And care about distorted TV-channels. Guess it was something like Paradise Hotel or Housewives of Miami on those channels ...

PS. Hav been listening to Natasha (Chesky Labs) in my car for a while and decided to have ago right now. Sounds VERY natural to me.

PPS. I have a tube preamp with a 6R7 tube (grid attached to top of tube), I hardly can use as it picks up noise from cell phones ... :lildevil:

Author:  mwhouston [ 12 Jan 2017, 09:23 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

I just received a 15W class D amp module. It fits in a match box. Not sure what to do with it but I'll think of something.

Author:  Soundbrigade [ 12 Jan 2017, 10:37 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

The problem are the connectors. Where to find microminiature RCA- and 4mm speakerconnectors ..... :confused:

Author:  KrammeAcoustics [ 23 Jan 2017, 08:53 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

heja magnus

now when you've got so many of those pam8403 amps, why not try to offer one two channel amp per loudspeaker. you could go even further by splitting each amplifier up in two ( matched with a two way loudspeaker ). one section (L) for the woofer and (R) for the tweeter. use a passive lowpass RC filter at input of the amplifier for the woofer and a passive highpass CR filter for the tweeter. remember to unmount the loudspeakers originally crossover filter. conclussion: four seperate amps serves four speaker units and it only needs to add four 1/4 w resistors and four bipolar caps in the region 1-10 k and 10-100 nF ( offcourse depending of the input impedance ).

try also to add electrolytic caps of 1000-2200 uF as close as possible to the voltage input terminals of the board. it helps to better sound which is needed.

well you're scandinavian, so i know you can do it :wizard:

Author:  Soundbrigade [ 23 Jan 2017, 11:12 ]
Post subject:  Re: PAM8403 - 3+3W D-amp

Struggling a bit with something more substantial. A small Hammond cast box with line inputs, speakrer conns, and, most important, the iPod docking station. Switching between the line IP and docking station (and indirectly to the phono connector in the iPod dock).
Didn't have a suitable potentiometer so I used a 100K linear potentiometer where the slider is connected to gnd through an 18K resistor. The result is an almost logarithmic curve. It's in this region I have problems right now. It seems that the potentiometer isn't grounded.

Alsdo, there's a 3,7V batteri inside the box. Pretty tight.





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