I need to make a temperature controlled 12 volt DC fan circuit which turn on at certain temperature ( say 40°C ) and turn off below 40°C ,but at 40°C the speed should be minimum and up on increasing temperature the fan speed should also increase.
ANY BODY HELP.
I already made this circuit but fan runs at high speed all times and it's noicey.
http://www.escol.com.my/Projects/Project-03(Thermostat-1)/Proj-03.html
And by searching I found this
https://forum.allaboutcircuits.com/...ert-linear-fan-control-to-switch-mode.122967/
ANY BODY HELP.
I already made this circuit but fan runs at high speed all times and it's noicey.
http://www.escol.com.my/Projects/Project-03(Thermostat-1)/Proj-03.html
And by searching I found this
https://forum.allaboutcircuits.com/...ert-linear-fan-control-to-switch-mode.122967/