Power supply for amplifier fan

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Marck3794

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Joined 2013
#1
Hi everyone,

I need a fan to cool down the heatsink of my chip amp, so i need a 12v power supply to power it.

But there isn't enough space in the chassis to fit another transformer.

So here it is the question : since i have a +/- 20v power supply in my amp, can i just take the voltage from one rail ( 0 - 20v ) and bring it down to 12v or this asymmetric design will damage the amplifier/power suppy?

(I know it's a stupid question but i didn't find an answer anywhere)
 
#2
The chip amp wont notice it. If you run the fan at 8V or so just use a resistor to loose the extra 12V.

If you are using a toroidal transformer, just wind an extra winding onto the core. Start with 10 turns and measure the voltage and then scale the winding according to your results. You don't need any special kind of wire, normal PVC coated wiring will do.
 
#3
KatieandDad said:
The chip amp wont notice it. If you run the fan at 8V or so just use a resistor to loose the extra 12V.

If you are using a toroidal transformer, just wind an extra winding onto the core. Start with 10 turns and measure the voltage and then scale the winding according to your results. You don't need any special kind of wire, normal PVC coated wiring will do.
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I think i'll just use a dropping resistor ,

Thank you for you answer 🙂
 
#7
Sorry, my bad... in the previous post i meant to say that when the fan is running i can hear some electrical noise in the speakers, i've already decoupled the fan with a capacitor and that seems to help a bit.

Also i noticed that even if i power up the fan with a wall-wart i can still hear that noise if the fan is close to the power amp.
 
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