I have worked on about 20 different QMX rigs for fellow hams. ?I made up a set of linear regulated ?PS boards for this kind of testing. ?3.3V from the existing linear regulator and 5V from a bench supply (fed from a hacked and burned up SMPS board) that I can control and measure the current. ?Feeding the ADC_ lines as well. ?This all works well and is very helpful in isolating problems and quickly confirming the main circuitry. ?One of my best tools.
