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EI3DIB > HELP 23.08.07 10:42l 38 Lines 1542 Bytes #999 (0) @ WW
BID : 61760_EI3DIB
Read: DG5YM GUEST
Subj: Switch mode ?
Path: DB0FHN<DB0MRW<DK0WUE<7M3TJZ<ON0AR<GB7CIP<EI3DIB
Sent: 070819/1533Z @:EI3DIB.#TIPP.IRL.EU #:61760 [Ardfinnan] FBB7.00i
From: EI3DIB@EI3DIB.#TIPP.IRL.EU
To : HELP@WW
HI any experts.
I am putting my foot in it here by possibly admitting I know little or nother
about switch mode PSU's apart from basic theory.
Give me a good old fashioned transformer any day and I know where I am.
So when a PSU for one of my Ex PMR Rigs blew up after a power surge I tried
to find a repair agent but as with much of this stuff it is now to old and
they no longer deal with them.
But I was lucky in a way as the chap I spoke to apeared to know what I was
talking about and also basicaly what to check ? Check the little Red VDR just
after the mains input ? yep I found that Ok, but here I have a problem.
It is RED and I managed to get hold of a couple but they black and Blue but
no Red ones ? No marking that I can see on the RED one so I presume like a
Resistor Colour code that the colour is the value ?
Can anyone on here tell me what the heck these little beasts are all about
and just what the colour represents and where I may obtain replacement ones
from as I presume they are obtainable easily enough if only I knew what I was
looking for ?
VDR ? Voltage dependant resistor perhaps ? sounds like an odd sort of beast
to me but as above at my age I cut my teath on transformers and Valves and
found it hard enough adapting to 3 legged Silicon blobs, these things have me
rearly confused. Anyone else remember the real Cats whisker ???
Without the sarcastic remarks !!! Any help apreciated please.
Best 73 from John, Sysop @ EI3DIB.#TIPP.IRL.EU
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