Updated 2x2 SiPM Array

A project log for All-In-One Gamma-Ray Spectrometer

More sensitive to gamma radiation than a Geiger counter with the added bonus of telling exactly what's inside your samples!

nuclearphoenixNuclearPhoenix 11/24/2023 at 17:300 Comments

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.

Front side with only the four SiPMs

Front side with only the four SiPMs
Back side with all the other components
Back side with all the other components

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:

Let me know what you think!