cooling fans

[Dave M.]

Does it make sense to use power supply output power to run it's own cooling
fan? Isn't that like fanning yourself? Aren't you actually getting hotter?
Nothing is over 100% efficient.

I want to add a mini fan to cool an NTE 7046 converter in a TV power supply.
The fan uses 120-140 milliamps. I'm concerned that the fan will just
aggravate an already heavy load problem. The other method would be to use
the relay-switched ac line to power a small transformer, bridge and filter
for the fan.

Thoughts?

Dave M.

 

[John Larkin]

On Tue, 12 Oct 2004 17:47:01 GMT, "Dave M."
<gadget007@rochester.rr.com> wrote:

Does it make sense to use power supply output power to run it's own cooling
fan?

Usually it is, by a big factor. A small amount of electrical power can
move enough air to do a lot of cooling, especially if the gear is
already sitting in still air.

John

 

[Dave M.]

Thanks,

It turns out I can run a 13.2 volt mini-fan at the TV PS's 8 volt output and
at only 69ma.


"John Larkin" <jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote in
message news:kj6om015upi45k2l2l97b47v0n0hptlpjc@4ax.com...

On Tue, 12 Oct 2004 17:47:01 GMT, "Dave M."
gadget007@rochester.rr.com> wrote:

Does it make sense to use power supply output power to run it's own
cooling
fan?

Usually it is, by a big factor. A small amount of electrical power can
move enough air to do a lot of cooling, especially if the gear is
already sitting in still air.

John