Two different methods of shifting from 3V3 down to 1V8 and vice versa. The second method is particularly useful as it requires less components and is bi-directional. The first method was required for prototyping a GPS module and was needed in a hurry and had to fit in a small space. I have included the work I did breadboarding the design as I was fairly happy with how small I got the circuit.

In the process of developing PCBs it is quite normal for the first revision of a design to require modification - either due to error or a design afterthought/improvement. Here are some examples and thoughts on how to successfully modify a PCB. This is not a specific project as such, rather an attempt to start collecting ideas and processes that I have come across or developed over the years. This is work in progress, please comment.

Cutting tracks: