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 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
