I'm working on the next revision of a prototype PCB board, and from the first one I learned that LEDs would be very helpful instead of having to probe each pin/wire for a certain state.
In this regard I have a design question; how would you add LEDs for debugging purposes to a PCB, such that they don't interfere with or alter the voltages and currents, and still keep the added components to a bare minimum.
As of right now my thought is placing a MOSFET gate on the wires in question, and then let that control the LED. But I'd like to know how you would do it, as I am no expert in electronics and always looking to learn from more experienced people.
· The signals being debugged are, of course, digital in nature.
· The LED's in question are going to be SMD, of course.
· If you have schematic examples that makes it so much easier to understand :D
— Thanks in advance :)