HiLetgo 5pcs PAM8403 2X 3W Mini Digital Power Amplifier Board AMP Class D 2.5-5V Input

I've been using this for 8 hours a day for the past month. I have it powering 2 - 16 ohm speakers (about 1.5W total between both channels). It hasn't had any issues at all. It doesn't even get warm to the touch at maximum volume for 8 hours straight. Definitely great value. I haven't tested the other 4 boards but they all appear to have the same build quality.

These work great! The sound was a little tingy so I added some capacitors and it sounds great now. They work well with the little 5v Bluetooth modules found on Amazon.

works perfectly for esp32

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.

Been an audio guy for many years so I was a bit skeptical of these coming from full rack size class AB stuff, but these are pretty impressive. They're not "hi-fi" by any means but they sound really good for what they are, and as others have mentioned they don't even get warm enough to bother slapping a little heat sink on. I wired up the first unit to run from a USB-A plug, with a standard 1/8" aux plug for input, and alligator leads for outputs. Connected it to a few different drivers and speakers for testing, threw some awkward passive crossovers at it, drove a 2 ohm load with it. Thing barely got warmer than room temp.There is a bit of noise on the output, quieted some with a small cap across the power input, would probably be better in a small shielded or metal project box, but again, it's really impressive for the price.The sound isn't as full or powerful as a "real" amp, but for something like a mini bluetooth boombox or a small project that needs to make noise, this would be ideal.

no compraria esto nuevamente, los compre una ves y no los volveria a comprar su audio no es el mejor, y podemos decir que solo sirven para pruebas, pero el audio es malo la verdad

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.

Works as described.