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| Authored by: Anonymous on Saturday, September 29 2012 @ 02:12 PM EDT |
A single finned selenium part with two terminals is just (in
effect) a single diode, not a bridge.
Per Wikipedia
(http://en.wikipedia.org/wiki/Selenium_rectifier), what
appears to be a single selenium rectifier is actually
multiple selenium rectifier cells in series, each with a
voltage drop of about 1 and a reverse voltage rating of
about 25.
These facts clue you in on how you might replace a selenium
unit with multiple silicon diodes to get close to
duplicating its series voltage drop: Series-connect multiple
identical silicon diodes (forward voltage drop, 0.6 to 0.7),
with a forward-current rating equal to or higher than that
of the part you're replacing.
As a guess, there's one heat-sink plate per selenium cell.
So for, say, a 7-plate selenium rectifier (7-volt drop) I'd
series-connect 10 or 11 silicon units of the same or higher
forward current rating. Use parts such that their reverse-
voltage ratings equal to or more than reverse-voltage rating
of the selenium part.
A higher-than-original-part reverse-voltage rating is
acceptable and even desirable, and should be easy to achieve
with modern silicon parts.
And of course connect all of the silicon subdiodes in the
same electrical direction (anode v cathode) as the original
selenium part.[ Reply to This | Parent | # ]
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- Selenium? - Authored by: bprice on Saturday, September 29 2012 @ 08:02 PM EDT
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