Hi. I am looking for a fan control circuit that will turn the fan on at 160 degrees F and off when temperature drops to 130 degrees F. I built one of my own and managed to get it to turn ON at 130 and OFF at 160. It was turning the fan on as it passed the 130 mark. That didnt occur to me at 1st. Silly me. Then I tried various circuits I found on the web and even one from a Data Sheet for the LM56 by National Semi.
I have now built 4 circuits, and not a one of them works as needed. Now I am out here asking if any of you gurus might have such a circuit or be able to point me to such a circuit, or even dream one up that I can try.
I have another circuit, a constant current PWM, that is working, but I now understand it is running the MOSFET in linear mode. For best functionality, at least as I now understand MOSFETs, the MOSFET should be running in switched mode. I am not sure this is entirely correct. If this sounds like something you can guide me on, please, educate me. Ill submit the PWM schematic (just have to get it prepared) if you need it to determine precisely what I mean.
Im just an old dog who has been around electronics many years and can usually piece something together when needed. But these 2 circuits are giving me fits. Any suggestions, designs, help of any sort will be greatly appreciated.
I have now built 4 circuits, and not a one of them works as needed. Now I am out here asking if any of you gurus might have such a circuit or be able to point me to such a circuit, or even dream one up that I can try.
I have another circuit, a constant current PWM, that is working, but I now understand it is running the MOSFET in linear mode. For best functionality, at least as I now understand MOSFETs, the MOSFET should be running in switched mode. I am not sure this is entirely correct. If this sounds like something you can guide me on, please, educate me. Ill submit the PWM schematic (just have to get it prepared) if you need it to determine precisely what I mean.
Im just an old dog who has been around electronics many years and can usually piece something together when needed. But these 2 circuits are giving me fits. Any suggestions, designs, help of any sort will be greatly appreciated.