VoltNode™ is a SA818 based UHF/VHF node designed to be compatible with the open source SVXLink project. The PCB was designed to fit over the OrangePiZero and the schematic and GPIO choice is based on the original work of the ROLink community, with the goal of having this hardware compatible with ready made OS images create by the ROLink community.
More info about this project in Voltlog #385.
Checkout assembly.pdf above for a drawing with component position and designators. This should help when you are assembling the PCB.
Someone designed a 3D printable case for the VoltNode.
Known issues in revA: The mic negative input on the orangepizero is left floating which could lead to some input noise being amplified. A fix is indicated in the schematic.
revB: Addressed the issue by addig capacitor to MIC1N.
