Just did a quick rework of the 2x2 MicroFC SiPM array PCB, added the temperature compensation from the single PCB and cleaned up the layout in general. It's now 2x2cm in size and still keeps the easy solderability for the four SiPMs (results in a fill factor of ~40%), while also adding the ~21mV/K slope for the power supply.

If you want to use it, just connect your power to the "VCC" pad, ground to "GND" and then the SiPM anodes to the spectrometer. You can check the set voltage at the "C" pad on the PCB. If you don't want to use the extra circuitry, you can just solder your power straight to the "C" pad and not bother with the other circuitry. However, you'll still have to solder the low-pass filters for each SiPM, otherwise they won't work.

You can find all the files here: https://github.com/OpenGammaProject/MicroFC-SiPM-Array-Board

Let me know what you think!