DROK 5W+5W Mini Amplifier Board 2pcs PAM8406 Audio Amplifier Board DC 5V Digital Stereo Power Amp 2.0 Dual Channel Class D Amplify Module for DIY Speaker Sound System

I am happy with this purchase.

Haven’t full used this item. I do currently see a square wave when sending a sin wave. I am not sure if the input is too high. I will keep testing the next time I use it.

So I am basically using the 3.5mm audio jack for input but I wired directly to a PCM5102 also purchased from here. https://amzn.to/49uvKUO Now, I have to say it is working great as long as I do not touch the volume control. It is not totally bad but you can get quite a bit of hum at high volume by just touching the volume. It may get better once I put in a case it is open air right now so the 60 Hz is easy to pickup on low side audio. However, there is a thing that makes this worse. The RCA jacks, they appear to be wired backward. That is the gold outside part of the jack is actually connected to the Left and Right + inputs! OOPS, that is not good that is supposed to be the grounded part of the RCA with the tab on the inside of the hole the Pos Line in so this makes it like an antenna for 60 Hz and if I touch the RCA gold outside surface the 60 Hz is terrible! So, I am going to remove them from my board to help raise the noise resistance. I will not be using them anyway. They did something strange with the diff input on these RCA jacks. It probably works but with the outside flipped like it is I would not use the RCA use an adapter and use the 3.5mm jack. I have not found a schematic to prove this case however my multi-meter tells me the Left Positive Line on the 3.5 jack is connected to the Outside of the Left RCA plug and the same holds true on the Right side. Again, I am removing them so it is not a big deal to me. Just FYI in your use of this amplifier. Double check the RCA jacks before using them!!!

I bought a 2 pack of these and neither one produces any good sound. Both of them are very hard to get RCA into. Plastic isn’t molded correct and have to push very hard to get them in. Soon as power is on they produce popping and whining noises that are very annoying. But no sound comes out from the input

like many others here talking about noise from the amp. I have one power supply that when playing music or even nothing playing the is dead quite for noise. The power supply is a 12v@1amp, then i get noise going up from there. nothing playing but the knob turned up a bit noise, even playing noise. this happens with my [email protected], [email protected], [email protected], and a 24v@4amp. now i bought the 19v3.41amp power supply last because i started looking for 3 prong grounded brick power supplies, yea still noise. This is the only thing being powered, no amount of moving/routing cables around matters. Maybe its quite even up to max rated voltage with fully regulated supplies, i don't know, wish i had one to test.