Probably a terrible idea but i must try it

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justan338

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Jan 29, 2013
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So, i want to modify a box fan so i can wrap a belt around it and a cars alternator wich would be connected to a car battery to power a car amplifier to power my car subwoofers, all in my home...thoughts or ideas?
 

Frank4d

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Sep 10, 2006
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It is probably a bad idea for a few reasons...

An alternator won't produce a regulated 12 volts without a battery and voltage regulator. Without these the alternator is free to produce 40 volts or so which would blow out your amplifier or even the alternator. An alternator output also has a lot of AC ripple, which the battery or a large capacitance helps smooth out.

Box fan motors don't develop much torque (they are designed to spin a fan blade). Connecting it to an alternator may put enough drag on the motor that it can fail to start up or run efficiently.

You also need to consider the diameters for pulleys connected to the fan motor and alternator, and the fan motor speed, so you don't spin the alternator too fast or too slow. For example, for a fan rotating at 1000 RPM with a pully having a circumference of 12 inches driving an alternator with a pully having a circumference of 6 inches, the alternator will spin at 2000 RPM. This really isn't a negative, just something you need to consider.

I think it would be better to power your amplifier with a 12 volt power supply, A high wattage computer power supply may even work depending on how much power is needed by the amplifier.
 
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