modifiying mp2307 buck converter boards

I was using some Mini360 DCDC buck converter modules to power raspbery pis when I noticed their output was a little noisy. On the bench with a 5ohm resistive load drawing about an amp, the output ripple was around 950mv, which is quite bad.

The upper two circles(red and yellow) are connected to the input voltage - I added a 10uF capacitor to each, which helped lower the input switching noise. The yellow circles are unpopulated pads, one for input and one for output. I added a 10uF capacitor to the pads in the lower yellow circle, and stacked three more 10uF capacitors around it.

I used 0805 capacitors, but the yellow pads were probably for 0603 parts - this makes them a little tricky to connect. The existing capacitor under the purple was larger than an 0805.

The final result was about 150mV of ripple at 1A - much better but still not great.