Voltage transformer for computer cooling fan - Electronic Circuits Projects Diagrams Free

lk23 · 18th June 2003, 08:57 PM

I am installing a 12 volt computer fan on the back of my stereo system to dissipate heat. The fan specs are 1.2 watt and .1 amp. What do I need to look for in a voltage transformer. I have found a 12 volt, 300mA transformer. Will that work? Do I need to match the amperage? Thanks

Klaus · 19th June 2003, 05:48 AM

It will work fine, in fact, you could safely run 3 such fans from this transformer.
However, you did not say if the transformers output was rectified. These computer fans require 12V DC voltage, a transformer all by itself puts out AC voltage. Its easily converted to DC by inserting a bridge rectifier.

If your Stereo runs that hot maybe it is because you turned the volume up too much

Klaus

lk23 · 19th June 2003, 01:52 PM

Klaus, THanks for the quick reply. Yes, the transformer is 12 volt DC. It was previously the power source for Koss wireless headphones that no longer work.

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18th June 2003, 08:57 PM	(permalink)
lk23	Voltage transformer for computer cooling fan I am installing a 12 volt computer fan on the back of my stereo system to dissipate heat. The fan specs are 1.2 watt and .1 amp. What do I need to look for in a voltage transformer. I have found a 12 volt, 300mA transformer. Will that work? Do I need to match the amperage? Thanks

19th June 2003, 05:48 AM	(permalink)
Klaus	It will work fine, in fact, you could safely run 3 such fans from this transformer. However, you did not say if the transformers output was rectified. These computer fans require 12V DC voltage, a transformer all by itself puts out AC voltage. Its easily converted to DC by inserting a bridge rectifier. If your Stereo runs that hot maybe it is because you turned the volume up too much Klaus

19th June 2003, 01:52 PM	(permalink)
lk23	Thanks Klaus, THanks for the quick reply. Yes, the transformer is 12 volt DC. It was previously the power source for Koss wireless headphones that no longer work.