Since the fan controller I already had didn't go very low, I decided to build my own with this circuit:
This circuit is cheap since the only powerful thing you need is the topmost transistor (since I was only controlling the stock Sonata case fan I just used the same transistor - BC337-16). Resistor, zener diode & potentiometer are not going to draw much so you can get low power versions. I chose a mini pot with metal knob because it was easier, but a cermet works just as well.
So I went to Maplins, was shocked when they had everything I wanted, and set upon building this thing. I already had a box & stripboard spare, but both are around £1 each (though the size of the circuit means you can cut the stripboard in three)
After gluing wires & socket in (and cutting a few holes in the box)
Lid screwed down and connected to fan/power (maybe I should've got a bigger box after all)
This is working very well for me - since the voltage now ranges from 0v-10.2v, I can set my fan to 4v where it runs practically silently.
I may investigate using a thermistor for automatic control, but that'll be for AirAdjuster Mark II
DIY fan controller
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That's a nice and simple circuit you got.
But unless you want to go below 5V for the fan you might as well buy a zalman fanmate. Cost around $5. The fanmate uses a voltage regulator, but what you have is almost the same but buildt from discrete components.
I suggest that you either secure the box very well or make some kind of insulation for the metal shaft so you can't accidentally short anything.
But unless you want to go below 5V for the fan you might as well buy a zalman fanmate. Cost around $5. The fanmate uses a voltage regulator, but what you have is almost the same but buildt from discrete components.
I suggest that you either secure the box very well or make some kind of insulation for the metal shaft so you can't accidentally short anything.
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The cheapest I've seen a fanmate over here is £7 - but since it only goes to 5v and the total cost is less than £3 (and much better for me since I already had stuff) I did this instead.
I agree - it would be a good idea to cover the metal parts with electrical tape. It wasn't necessary for me since I've tucked this in the corner of the drive cage now, but using a cermet and a plastic knob would be a better choice.
I agree - it would be a good idea to cover the metal parts with electrical tape. It wasn't necessary for me since I've tucked this in the corner of the drive cage now, but using a cermet and a plastic knob would be a better choice.