I have power supply that has selectable voltage with resistors (470 & 1K ohm 1/2w carbon film +-5%). The resistors measures 462 and 970 when they were installed and as soon as I turned on the unit and measured the values again (when it was off) the resistor values were 440 and 900. This happened on 2 different identical supplies with two sets of resistors. This is the first time I have used these resistors so I don't know if that is normal or not.
Can anyone shed some light on why this may be happening and whether I may have bad resistors or what?
Can anyone shed some light on why this may be happening and whether I may have bad resistors or what?