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Author Topic: Circuit change for Two Speed Temperature Fan PWM Controller  (Read 2302 times)

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kam

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Circuit change for Two Speed Temperature Fan PWM Controller
« on: October 19, 2010, 16:59:32 PM »
Attached i have the schematic update for the Two Speed Temperature Fan PWM Controller. Hopefully, this change will make an off delay for the fan. Try and tell us the results.

kam

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Re: Circuit change for Two Speed Temperature Fan PWM Controller
« Reply #1 on: October 19, 2010, 17:05:41 PM »
Better add an 150 ohm resistor before the cap as well, to prevent over current through the T2. Check this schematic.

Keep in mind, that this change may alter the circuit startup procedure. The fan will probably start with very low rpm and probably will increase slowly.
« Last Edit: October 19, 2010, 17:07:51 PM by kam »