3. Soldering

Soldering can be tricky so you need to take your time, all the process took me two hours and a half. The idea is to make smooth and shiny solder joints. I started with the USB connector and from the smallest ones to the biggers. Trying always to do first the components placed in the middle, leaving the components on the edges for the last. I used Neil's design.

During the soldering or at least once after finish, we have to tester the connections to see the connectivity and that the current pass across the circuit without short-circuit.