[Elecraft] Power Supply?

[Phil Hystad]

Andrew...

Isn't the RS-20M a linear power supply?  I do not have an RS-20M, I have two RS-35M and neither of those have fans either.  But, I was assuming that the power supply we have been discussing would be a switcher and contained in a smaller box (the P3 box) so I think it would demand a fan.  I have had two other switchers in a box about the size of the P3 and both of them had fans -- noisy fans in fact which is the reason I got rid of them.

phil

On Jul 2, 2011, at 2:21 PM, Andrew Moore wrote:

> K7PEH> You would need a cooling fan in their for a 20 to 25 amp supply and I
> don't think the P3 is set up to handle a fan.
> 
> My RS-20M doesn't have or need a cooling fan (though that's in part due to
> its venting and heat sink, so that needs to be carried over to the P3
> enclousre).  I'm going to see if I can migrate it to the P3 (which itself
> probably doesn't generate a lot of heat).  If it needs one, fans are small
> and can sit right on top of the case, fed with 12 V from the supply that
> will now reside inside.
> 
> AC7AC> And much of that space in the P3 is reserved for P3 add-ons that are
> in development.
> 
> I expect I'll be so happy when my bare bones P3 arrives that I'll live with
> it as-is for a while.  If I'm tempted to fill out the inside with add-ons,
> I'll remove the supply at that time and figure out Plan B.
> 
> AC7AC> I rather like the idea of an external power supply. It doesn't need
> to occupy table-top space; mine sits on a box under the desk.
> 
> Same here - but I'd like it more if it matched the P3 enclosure.  And now it
> might... This may be too ambitious but I'll give it a shot and won't be too
> proud to say "you can say you told me so" if I fail.  If it's too much of a
> stretch to fit a 20 A supply in there, I'll use a supply of less than 20 A,
> and settle for running less than 100 watts from the K3.  When I get a KPA500
> sometime in the (distant?) future, I'm sure the stepped-down K3 would still
> have plenty drive to run the amp at a level acceptable for my needs.
> 
> Really wish I could just buy a blank P3 enclosure and save all the trouble.
> 
> --Andrew, NV1B
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