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Post: hallo andrew, thank you for replay. maybe i wrote it wrongly. will try again: - i know adc_pi got voltage divider - i measure 12v and 5V not 15v. but this is not important, what ever i need to measure, i will do the resistor math from voltage input and ouput - each circuit has it's own voltage divider (one for 5v and second for 12v) - for 12V i need to use another voltage divider with two resistors, using just one will burn adc_pi,as explained in original post -also i believe that using another voltage divider will make some offset, but it should not get error like 33% did you try to measure with adc_pi own power source for rpi like you describe? thank you,pavel