Pc Power Supply Wiring Diagram. This video does a quick walk. Yx 6302 Atx Power Supply Pin Out Connector Wiring Diagram.
Turning on the Power Supply It is designed to not turn on unless it is connected to a computer motherboard. 12v 350 watt power supplies are very common when using various light controller boards SanDevices Falcon16 LOR CMB24D etc. AT and ATX PC computer supplies schematics.
If you plug them both into the same power supply cable then you are drawing all the power of the PCI Express connector through a single 18 gauge wire.
But it still has the same characteristics as a fixed regulated power supply. It will keep a stable voltage when it has any load. This is controlled by the green power on wire. Note that most schematics circulating on the internet depict old-style PSU with bipolar transistors and without PFC.