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Can use the computer USB port 5V power supply or using a mobile phone charger USB port 5V power supply
battery power can also be used high efficiency:90%
can provide 3W (left channel) +3 W (right channel) output power in the 4 load and 5V power supply conditions
A class, B class amplifier such efficiency is only about 30%
D class amplifier is highly respected today
D class amplifier efficiency is extremely high, not because of temperature affect the sound quality but do not add heat sink and take less space noise canceling circuit was built in the amplifier board
power on / off without pop noise
module has a short-circuit current protection and over-temperature protection
Application:
LCD TVs, monitors/Laptop/Portable Speakers/ Portable DVD players,/game consoles/ Phone / speakerphone
Specifications:
Operating voltage: 2.5V-5.5V
Speaker With:4-8ohms recommended:4 ohms
Speaker Power :2-8W
Size:21 x 18 x 3.4mm(L x W x H)
Color:As the pics show
Net weight:1g
Package Included:
5*Super Mini PAM8403 Digital Power Amplifier Board
Note:Left and right channel output "negative" can not be connected together, otherwise it will burn IC, and should be connected before the horn (load). Rated working voltage 2.5 ~ 5V, the limit working voltage 5.5V
neil
Reviewed in the United States on August 15, 2024
small wish it had a better way to mount. only used one worked as i needed sound was ok
ricardo j sanchez
Reviewed in Spain on August 12, 2024
The media could not be loaded.
MM
Reviewed in the United States on March 27, 2024
When I bought these they came in a tiny foil bag. I used one of them on two tiny 3 watt speakers. When I tested them I noticed that it was extremely ‘scratchy’. When the speaker would hit low notes they would just get really muffled. Genuinely considered returning. But because they were five bucks decided to keep them. Ended up getting a surround sound system with no amp or receiver. Remembered I had these and used them. They all worked perfectly. So a word of help is use these on bigger more power hungry speakers (my surround sound using 60 watts from each amp) so they aren’t ’scratchy’. To clarify if you using this on tiny 3 watt speakers and they sound really bad especially on those bass notes, hook the boards up to more power hungry ones (I’m using them on two 30 watt ones[plus a woofer]).
Tom Crowley
Reviewed in the United States on December 31, 2024
Replaced the failing circuit, installed the new on (now have 4 spares) Works great.
NK
Reviewed in the United States on October 8, 2024
Sounds good for my application but note that the output contains the PWM signal from the amp, which is a noisy 250KHz square wave. This is well outside of the response range of your average speaker, and certainly not audible, but it's definitely there. If it affects the audio or not, I can't really tell.Since it's not stated here (but is in the PAM8403 datasheet), make sure your speakers are connected BEFORE powering up, and that your input signal is within -0.3 and +0.3V. Otherwise you could damage these.These benefit from good placement in your project to avoid picking up noise. Adding ferrite beads on the outputs wouldn't hurt either. Read the PAM8403 datasheet and look at the sample circuits to get the most out of these.For boards like these that don't have mounting holes, I use the pins to provide mechanical connection as well as electrical. Unfortunately, the pins aren't well aligned to do that on a standard perfboard. The outputs are perfectly aligned, so they fit well, but the input and power connections aren't. You can bend your pins slightly to make it work, but it's crazy that they just didn't align them, it's literally only off by a mm or less in each direction.
ND
Reviewed in the United States on June 11, 2023
Love these little guys - tiny, simple to wire up and enough juice to make things happen. Great for prototyping, etc. I only wish there were a mounting hole or two.
Keith
Reviewed in the United States on March 16, 2022
I needed a small cheap amplifier to test out some custom speakers I built and this does the job! Great sound output and the performance blows my mind! You can squeeze in small pitch 2 pin terminal blocks for solder free connections for power and audio out.
Steven
Reviewed in Canada on September 29, 2020
This little amplifier module really packs a good punch. Decent sound quality for smaller diy boombox projects. I'd buy again.
Filippo
Reviewed in Italy on July 24, 2020
Segnalo che ho ricevuto 10 amplificatori come da titolo (la descrizione a volte dice 5 e a volte 10).Piccolo (come una moneta) e funzionale, non è praticissimo da usare con breadboard (i contatti non si allineano con i buchi di una breadboard standard) ma fa il suo. Ne ho provati un paio e funzionano, e non ho sentito evidenti e gravi distorsioni sul suono.
meadors
Reviewed in the United States on August 25, 2019
These PAM8403 amplifier modules aren't going to win an award for audiophile grade high fidelity, but they sure are fun for bluetooth speakers and ~5v applications. They're tiny in form factor and dirt simple to wire. I've used them for bluetooth speaker wiring with a simple stereo to mono summing circuit. It's really easy to build at least a workable prototype with them. It's hard to beat the price with having 5 of them, too.
Raff
Reviewed in the United Kingdom on March 25, 2019
First off, the price was very good for a small 3watt + 3watt amplifier. In fact you get 10 cards which I didn't need. I would have preferred to buy say a couple for a lower price. Anyway it is compact with no large coils or electrolytics. This is quite innovative for a class D amplifier. It is still a good idea to put some ferrite beads on the wires though to reduce RF interference. It is powered by 5v, probably a USB outlet and has a reasonable volume. 3 watts is into 4 ohms 10%THD. Each board is stereo. So good for desktop speakers etc.
Joe McGlothin
Reviewed in the United States on January 4, 2019
I'm using this for a RetroPie build and the testing so far for sound quality has been great! Seems to push a decent amount of power for such a small board and especially handy because it can run off the battery directly, doesn't need to get boosted to 5V! Doesn't save too much because the efficiency is generally pretty high, but eliminates the extra current required for the boost!I just ended up using some cheap-o speakers I scavenged from an old bluetooth speaker set and have had no complaints, especially for the cost!
GeekySimian
Reviewed in the United Kingdom on December 3, 2018
Bought six of these for general purpose amps in a school electronics lab. So far have built two (using a DC to DC converter from elsewhere on Amazon to provide 5V whatever the students try to connect to it) and they've worked really well. Gain is just enough to drive the amp into clipping with the input driven from a mobile phone headphone lead.Mounting is a little difficult as the board is so small. My first two are hot glued on for the time being, but am going to use self adhesive foam pads for the remaining four.
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