[TenTec] Noise from Fans

[Bill Ny9h]

I use an import chopper dc to control speed on 4pabst fans in a box , in an enclosure  behind the wall which fronts in a nice cabinet, with multiple 3" dryer hoses on multiple shelf levels, evacuating hot air. I use the hoses also to decouple fan noise. 
My Acom amp , along with network switch, router, magicjack, raid netdrive is in the enclosure ,not the  operating room...  A kpa 500 is on a shelf...And the icom 7800 make heat , also a k3...and other stuff.
Pictures by googling. Ny9h,  click on "see more shack pictures"

Now the kicker...in the winter I vent heat back into the room, in the summer it vents into the garage, which is the adjoining room.

Bill

Sent from my iPad

On Mar 7, 2014, at 3:18 AM, K8JHR <jrichards at k8jhr.com> wrote:

> I made a fan built into my shelf system to help the amp vent hot air. I used an Off-On-Off switch with a single resistor to accomplish that feat.   This gives me high and low speed with just a flick of the switch.
> 
> Why is a diode better than a resistor?  OR is it just another way to skin the same cat?
> 
> I will have to send you some photos off list, as it turned out nicely. I did this even though I think I cut enough air holes in the shelf to accommodate the hot air, but figured this would be better in any case - cannot be too safe, ya know.
> 
> -------------------  K8JHR  --------------------
> 
> On 3/7/2014 2:51 AM, Rick - DJ0IP / NJ0IP wrote:
>> That is very good.
>> Try using diodes instead of a resistor.
>> Use a string of 1N4004 or similar.
>> Each diode drops a good half volt.
>> You can even make it multi speed if you add a small switch.
>> ______________________________________________
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