Powering Up
Once you’ve soldered in the components needed for the power supply, power up the board and check that this is operational. Also check that you have power on every pad on the board where you expect power to be, and check the ground pads to make sure that there is no power where you expect no power to be.
Next, solder in the power-decoupling capacitors for the ICs. Add in the processor’s oscillator and decoupling capacitors. If the oscillator is a module, check its operation with an oscilloscope. Does it have a waveform on its output pin?
If IC sockets are used, solder these next, then insert the components. If you’re using processors that need to be externally reprogrammed, then sockets are a good idea.
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