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Topic: Temperature controller with resistive heating element. Help with circuit. (Read 1 time) previous topic - next topic

retrolefty


The system that I am controlling is sensitive to magnetic fields and I therefore cannot have a current controlling the heating element that switches on and off rapidly.  So, I don't think the MOSFET will work for what I'm doing, since it does just that.  Does anyone have any suggestions for controlling an analog DC current, so that it won't be changing rapidly in time? 

Thanks for the help, guys.


Heating elements usually don't create large magnetic fields, unless it's formed as a coil with lots of turns.

Lefty

KDanielH



The system that I am controlling is sensitive to magnetic fields and I therefore cannot have a current controlling the heating element that switches on and off rapidly.  So, I don't think the MOSFET will work for what I'm doing, since it does just that.  Does anyone have any suggestions for controlling an analog DC current, so that it won't be changing rapidly in time? 

Thanks for the help, guys.


Heating elements usually don't create large magnetic fields, unless it's formed as a coil with lots of turns.

Lefty



I will have to check what the allowable change in B-field for my system is, but I do believe it is pretty low.

If it turns out that the MOSFET will not work, do people know of any other methods that might produce a less dynamic current?

Thanks for the reply

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