I have an old Intel E29477-002 fan lying around and I want to turn it into a desk fan. Any ideas how to make a Low/Off/High speed switch for it with a SPDT switch? The fan should spin on 50% speed on low and full speed on high.
My SPDT switch has three positions: On1, Off, and On2. I tried that, but the fan whined on the LOW setting. I am powering it with a 9v battery.If you had 12V, and a SPDT switch, you could wire up a big resistor to slow the fan down, and straight through for full power. Unplugging it would be your third state.
A potentiometer would make more sense, then you wouldn't need a switch at all. Unless you wanted to get rid of the waste of heating the potentiometer all day when you turn it up to stop the fan going.
Its a 12v fan.My SPDT switch has three positions: On1, Off, and On2. I tried that, but the fan whined on the LOW setting. I am powering it with a 9v battery.
It whines, but still spins at half speed on the low setting. The voltage is 5v on low.Its a 12v fan.
If you're powering it with a 9v battery then on low you're only hitting it with 4. 5v at the most - that's not enough, the motor is struggling to turn the fan hence the whine.
Use a 12v battery instead.
If I voltage control the fan, it whines on the LOW setting, but it does spin up.Pulse Width Modulation works by rapidly switching a fixed DC source to reduce power output. You can't do this manually with a switch. It is done with a transistor (MOSFET usually) and is a lot more complicated then it sounds.
You have a single pull triple throw if there are three discrete positions. Same would apply, closed circuit, resistor that lets half power through, and open circuit. Would need to be like a 2W resistor for safety. Or a resistor divider to spread the load a little. Something like a 200 Ohm and 400 Ohm maybe, fan V+ would get connected between the two resistor in series. With the larger being closer to the 9V+.
9V battery, yeah, not really enough for a 12V fan. When the battery is full it will be like 10V+. Not really sure what half speed would be there, fan might spin at 5V, but not something I have tried with a stock Intel fan. I have a lot of 12V fan that will just spin at 5V though, even from stopped. Might be a scenario where you start it on high and then move it to 'half' speed. (How AC fans work, actually.)
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