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. Author manuscript; available in PMC: 2019 Jun 12.
Published in final edited form as: HardwareX. 2019 Apr 15;5:e00063. doi: 10.1016/j.ohx.2019.e00063

Fig. 3.

Fig. 3.

Main PCB (left) and pressure regulator PCB (right) before and after all components have been soldered on. Most components are mounted on the top side of the main PCB (back side not shown here), while the pressure regulator PCB has components on both sides to save space.