Chris wrote:
How about using the open frame linear supplies like the ones from Power One or Lambda?
I have had very good results with Deltron open-frame linear supplies. They have selectable mains voltage and low output noise (1mVrms/5mVp-p). I have used many (i.e., hundreds) of the Model W303E triple-output supply. These have one, 5v/8A section and two sections, each selectable between 5v/12v/15v at 0.7A/1.7A/1.5A. [*NOTE* there is an overall 55W output limit, so they will not do all of that at once.] Each section can be adjusted +/- 5%. These show up regularly on ebay.
As for switchers, I have been satisfied with the performance of Integrated Power Designs (IPD) products. [IPD is a different company than Power Designs, who made some of the best lab and bench power supplies of the 1960s through 1990s.] One in particular may be of interest to time nuts: the Model SRW-65-4006. This is a four-output supply (5v/5A, 24v/1A, and +/-15v/2A) [*NOTE* again, there is a 65W overall limit, so it won't do all of that at once]. It is available open-frame or with a chassis and cover. For installation close to other circuitry, and particularly inside a piece of equipment, I strongly recommend the model with both chassis and cover (options CH and CO). Check ebay and look at distributors.
Assume you will need to post-filter the switcher output, either with L/C filters or low noise linear regulators. Note that I did not say "LDOs". I don't know why, but everyone seems to be stuck on LDOs these days. Active regulators (including LDOs) *always* perform better with more headroom (up to 4v or so). The only excuse for designing LDO is if you have a gun to your head from a power budget you can't otherwise control. [Here, "LDO" is mostly a matter of how you use the part, not of its claimed capabilities -- "LDO" regulators work much better with at least 4v of headroom.]
Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
