JohnWondersWhy
New Member
Hello,
I have a 100 (variable) volt input that I need to drop to 10v.
So, I've used a 2700 + 300 ohm resistors (3 watt) in series to do this. The problem is that the 2700 resistor will be much warmer than the 300 causing my 10/1 ratio to vary. The ratio doesn't have to be exact; but, I'd like the system to be stable (better that 1%).
Any ideas on how to stablize the divider? Or is there an easier way (less heat) way to do this?
I'm considering potting the two resistors or probably just using a TO-220 package and piggyback the resistors together. Both in an attempt to keep them at somewhat the same temperature.
More background . . .
-the high voltage is being pulsed at 10khz
-I'm using low value resistors for noise immunity (they are feeding an op-amp and then on to a ADC)
I have a 100 (variable) volt input that I need to drop to 10v.
So, I've used a 2700 + 300 ohm resistors (3 watt) in series to do this. The problem is that the 2700 resistor will be much warmer than the 300 causing my 10/1 ratio to vary. The ratio doesn't have to be exact; but, I'd like the system to be stable (better that 1%).
Any ideas on how to stablize the divider? Or is there an easier way (less heat) way to do this?
I'm considering potting the two resistors or probably just using a TO-220 package and piggyback the resistors together. Both in an attempt to keep them at somewhat the same temperature.
More background . . .
-the high voltage is being pulsed at 10khz
-I'm using low value resistors for noise immunity (they are feeding an op-amp and then on to a ADC)