banditpowdercoat
03/04/2010, 09:01 PM
I am building a fan/temp speed control using a 10K thermistor, 10K Pot and Mosfet. All works fine, but I would like more gain, I guess it is out of the thermistor. I have looked and I don;t think I can find one that will work directly. Basically, I would like the Mosfet to be triggered with the 20*f change but at 10* change, or there abouts. If that makes sense.
Faster slope I guess it is.
This picture is somewhat what I am building. But change the Switch for a 10K Thermistor, and the Resistor for a 10K Pot
The reason for the pot is to be able to adjust the "on" signal for different brushless fan's.
http://upload.wikimedia.org/wikipedia/en/4/4a/Mosfet_n-ch_circuit.svg
Is there something easy I can incorporate? I thought about an OP Amp, but maybe simpler design? a transistor for a darlington configuration maybe??
Faster slope I guess it is.
This picture is somewhat what I am building. But change the Switch for a 10K Thermistor, and the Resistor for a 10K Pot
The reason for the pot is to be able to adjust the "on" signal for different brushless fan's.
http://upload.wikimedia.org/wikipedia/en/4/4a/Mosfet_n-ch_circuit.svg
Is there something easy I can incorporate? I thought about an OP Amp, but maybe simpler design? a transistor for a darlington configuration maybe??