weekendguy
New Member
I need some help with a simple circuit - I want to convert the difference between 2 resistors (actually 10K thermistors) into a linear 2-10 vdc voltage output. If the resistances are the same, the output voltage is low, the greater the difference the higher the output voltage up to 10vdc. I am picturing using a comparator but I'm just not clear on the approach.
I'd need to be able to set upper and lower output voltage limits (may need to tweak actual output range to be 4-8vdc for example). And same on the input side - would need to tweak range of what difference is considered high and low.
Thermistors will provide resistance in the range of 750-5000 ohms.
The output goes to a motor speed control to set a pump motor speed - lower difference, lower speed; higher difference, higher speed.
I'd need to be able to set upper and lower output voltage limits (may need to tweak actual output range to be 4-8vdc for example). And same on the input side - would need to tweak range of what difference is considered high and low.
Thermistors will provide resistance in the range of 750-5000 ohms.
The output goes to a motor speed control to set a pump motor speed - lower difference, lower speed; higher difference, higher speed.
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