Driven by 120 VAC? 500 watts and cheap don't go very well together, unless you are thinking of surplus or used equipment, and then the shipping might scare you.
Maybe:
Rated around 500W and which is cheap?
-- Dirk
The Consensus:- The political party for the new millenium
Volume. Order a million 24V 400W PSUs and you can probably get them for $15(us).
The cheapest way is probably 2 cheap PC power supplies, and 2 big diodes in case they get shorted.
Production items. So, how come 400W PC PSUs are so cheap and a 24V PSU isn't?
-- Dirk The Consensus:- The political party for the new millenium http://www.theconsensus.org
Check with Jameco; they have a reasonable selection of higher-powered switchers. I was looking for a 3.3 V, 20+ A supply yesterday and they had a couple around US$80 quantity 1. The parametric search on their Web site is fairly useless; download the PDF catalog and flip through the power supply pages.
Matt Roberds
That's 66W. The OP wanted 500.
robert
We buy lower power, 150W 24V switchers from
-- Regards, Carl Ijames carl.ijames at verizon.net
My mistake; you're right. I was thinking about some bigger supplies that I was also looking up at Jameco yesterday. They do have ones that big, but a 24 V, 25 A supply starts at $174/1 and gets worse from there.
Matt Roberds
Battery charger. I used to work for these guys:
If you call them, tell them Rich Gryce sent you. ;-)
Good Luck! Rich
I'm starting to think that a big fat transformer and some fat caps are going to be the cheap way to go. I don't need super regulated PS.
-- Dirk The Consensus:- The political party for the new millenium http://www.theconsensus.org
In article , Dirk Bruere at Neopax wrote: [...]
If nothing else is at issue, this usually is the lowest cost way to go.
-- -- kensmith@rahul.net forging knowledge
to
Can one get 500W of transformer, plus large caps, for the price of 2 PC power supplies?
I read in sci.electronics.design that Ian Stirling wrote (in ) about '24V switching PSU?', on Wed, 12 Oct 2005:
Can you get 500 W at 24 V out of two PC power supplies? The 12 V outputs are usually fairly low power compared with the 5 V outputs.
-- Regards, John Woodgate, OOO - Own Opinions Only. If everything has been designed, a god designed evolution by natural selection. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
Hope you weren't referring to astrodyne, since their website does have pricing. They also have a 225W open frame unit for $125 qty 1 if you wanted to use one psu per motor :-). They only have the 500W version as an enclosed unit, not open frame. We were looking at powering a brushless dc motor a while back, and at 24V and about 75 W an open frame switcher from astrodyne was cheaper than I could find a power transformer, bridge, and caps. Good luck with your search.
-- Regards, Carl Ijames carl.ijames at verizon.net
Well, since I intend to use it to drive some 200W 24V DC motors a bit of ripple won't matter. BTW, I really dislike sites that don't have prices.
-- Dirk The Consensus:- The political party for the new millenium http://www.theconsensus.org
Notwithstanding stacking PC power supplies is probably not a really exceptionally great idea. :-)
Cheers! Rich
Not true anymore. The processors are powered off the +12V supply output (the ATX-12V and EPS-12V specs). That's were the real power is (500W is a little high though).
Here is one with 440W (20A) on the +12V output:
-- Keith
Why then does "Watts RMS" Get 1.55 million hits on Google, and "RMS Watts" gets over 15,000?
Not to mention "continuous RMS watts" which gets almost 200 hits, probably fewer than the others because it's the crème de la crème of watts.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
You also have to consider the distinction between mere "continuous watts" and the superior "continuous RMS watts".
Here you can see that Yamaha is fully aware of the difference:
"Continuous RMS power is the spec that really tells you how powerful an amplifier is"
And here are some relatively high-end ($28,290 per amplifier) tube amplifiers-- 18 watts "Continuous RMS watts/channel into 8 ohms"
Of course the more expensive amplifiers offer more of those "continuous RMS watts".
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Maybe he meant "RMS" as in "Ridiculous Marketing Standard". ;-P
Cheers! Rich
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