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In Reply to: power supply caps question posted by Damon on September 21, 2000 at 15:48:56:
The selection of one value or another for a particular component depends (ideally--let's exclude cost as a consideraton) on what the component is supposed to do. "47" values are common all over because they happen to be standard values (I don't know how or why that came to be). In a power supply, caps are usually filters. If you're trying to smooth out raw rectified AC, the bigger the cap, the more effective the filtering, generally speaking. If you're trying to filter out RFI, EMI, power line noise, and the like, then the particular frequency being targeted for elimination becomes a factor. Low frequencies can only get through bigger caps. High frequencies see those same big caps as high impedances, however, so smaller values more effectively filter out those frequencies.
In the real world, it's likely that the "47's" are cheaply available and are close enough to an ideal value to do the job.Duane H
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- Re: power supply caps question - Duane H 10:45:17 09/22/00 (0)
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