Amplifier project aftermath: 20W stereo version

While finishing my work on the Roskilde boombox project with the MAX9768 chip I discovered that there is a sister-chip called MAX9744. While the 9768 is a 10W mono amplifier the 9744 is a 20W stereo chip! so 4 times the power in a single chip, while the same controls are maintained! This was too good to pass up, so I present to you, the Rev.4 of my amplifier project. This is basically just the recommended system design with SMD parts.

schematic_20w

The schematic layout more or less matches the 9768 design file. The only change is the dual input and output along with a 100uF cap at the output stage supply.layout_20W

 

The layout is quite small as well – 25.4mm * 22.4mm. I have put a lot of thermal vias on this one just to be sure the heat can get away from the chip.

 

So there you have it – go make some noise!

Rev.4 – 20W – Stereo (unverified. Read as I haven’t made a prototype yet.)

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