I’m using voltage dividers to drop down from high voltages like 327V peak to 2.5V peak and read it with an ADC. (Also reading lower voltages like 5V from various sources, so the above was just an example)
In that particular case I’m using 1.3Mohms with 10Kohms resistors, giving a current of 0.25mA, with 80mW power.
Should I use 130Kohms and 1Kohms? Power will get a bit high. Also, if I’m drawing 2.5mA with my measuring it might affect the circuit I’m reading.
The question is: At what current values does noise become a thing to look out for?
