The sensor board 1108 may include one or more of a power supply connector 11082, an AC DC converter 11084, a voltage regulator 11086 and a power unit 11088. The power supply connector 11082 is electrically coupled to the plurality of wire terminals 720, and configured to receive an external power supply. The AC DC converter 11084 is coupled to the power supply connector 11082 and configured to generate one or more DC supply voltages to drive various electronic components of the doorbell camera 106. The voltage regulator 11086 is configured to regulate the one or more DC supply voltages to one or more internal supply voltages as needed. The power unit 11088 is coupled to the image sensor array 1114 and/or the image processor to provide power therefor. In some implementations, the sensor board 1108 further includes one or more storage capacitors that are configured to enable voltage conversion and regulation by the AC DC converter 11084 and the voltage regulator 11086. In some implementations, the main board 1110 includes at least a central processing unit CPU, a memory system e. g. , including memory and a memory controller. In an example, the main board 1110 includes a system on chip SoC, a memory e. g.