Hi Guys,
I am curious. I am trying to design a thermal differential controller and ended up with the circuits as in the attached picture below.
If the temperature on the Collector thermister is greater (about 5⁰C degrees or more) than the temperature on the Storage thermister, then the pump runs, otherwise it is off.
Thermisters are rated as 5k @ 25⁰C degrees
Presets (VR1 and VR2-in both circuits) are 2k ohms
Pump (MT1) is rated as 12vDC 6W 0.5A
I wanted to ask your opinion, which would you consider is the better circuit - Circuit 1 or Circuit 2 and why?
And is there anything that I have not thought of?
Many thanks for your comments and thoughts.
PS. I may use an LM393 instead of an LM358
I am curious. I am trying to design a thermal differential controller and ended up with the circuits as in the attached picture below.
If the temperature on the Collector thermister is greater (about 5⁰C degrees or more) than the temperature on the Storage thermister, then the pump runs, otherwise it is off.
Thermisters are rated as 5k @ 25⁰C degrees
Presets (VR1 and VR2-in both circuits) are 2k ohms
Pump (MT1) is rated as 12vDC 6W 0.5A
I wanted to ask your opinion, which would you consider is the better circuit - Circuit 1 or Circuit 2 and why?
And is there anything that I have not thought of?
Many thanks for your comments and thoughts.
PS. I may use an LM393 instead of an LM358
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