Gain not working? MAX98306

I’ve purchased a “Stereo 3.7W Class D Audio Amplifier - MAX98306” to drive a single 8 ohm speaker in an arduino project. I’ve tried shorting the gain selector but I’m not hearing a volume difference compared to nothing being shorted at all.

I’ve tried all of the gain options without luck. I am using it mono mode with only the R-channel attached.

I’ve got some pictures below in case I’ve done something obviously wrong with the wiring.

Any help would be appreciated.


Hi Scyzer,

Everything looks to be connected correctly to me, though I personally would have used the included header pins and shorting block instead of soldering a wire in place for the gound setting. This would make it easy to instantly check the different gain settings volume difference.

Can you check the resistance from the hole marked G- to ground? This should measure a dead short if your jumper wire is soldered in without any bad solder joints.

1 Like

Legend - will grab the multi tonight.

As for the header pins + shorting block - the shorting block was missing from my kit!

Hi Scyzer,

Let us know your results, I’m keen to get to the bottom of this.

Let us know if this happens in the future and we can organise something to get you back on track.