Full Member level 3
Hi - I'm working on designing a board that will have a high voltage DC input. The voltage could be anywhere between 0 and 5KV. I'd like an indicator LED to light up when the voltage is at a dangerous level. Say - 50V. The high voltage is generated on a different board and it is not a strong power supply - so I don't want to put much load on it. The best idea I have is to make a massive voltage divider and run an LED with a comparator. Can anybody think of any better ways of doing it? That approach annoys me as those resistors will have to be a huge value to keep from drawing too much current.