Five-Way LCD PANEL METER AND USB DISPLAY

摘要

We came up with this idea while working on the high-current linear power supply design that we started describing last month (part 2 starts on page 68 of this issue). We needed a way to show several different voltage and current readings, along with heatsink temperature, and it just didn't make sense to use several panel meters for that job. It's difficult enough to cut a single neat rectangle in the front panel of the instrument case to fit one screen, let alone three or even five. And there would be a lot of extra wiring if we used separate panel meters, plus increased current draw and it could end up pretty expensive.