[TenTec] Noise from Fans

[Rick - DJ0IP / NJ0IP]

The resistor probably gets pretty hot.
The diode string does not.
Also, with a diode string, you can select more than one speed, if desired.
At the end of the day, "poor cat"; loses its skin, one way or the other.

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of K8JHR
Sent: Friday, March 07, 2014 9:19 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Noise from Fans

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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