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Article #1645Re: Understanding a split-mode power supply.
From: David L. Jones
Date: Sun, 04 Jan 2009 09:45
Date: Sun, 04 Jan 2009 09:45
43 lines
2952 bytes
2952 bytes
"Phil Allison" <philallison@tpg.com.au> wrote in message news:6sb46vF53m30U1@mid.individual.net... > > "Sylvia Else" >> Phil Allison wrote: > >>> ** In an earlier post you state the PCB had been subjected to water >>> ingress and insect attack - so almost anything is possible. >>> >>> Odds are, the switching transistor was forced hard on by the above, >>> taking out the 8.2 ohms and Q1 in quick succession. >>> >>> Relace whatever parts you find are damaged, clean the PCB carefully with >>> detergent and a brush (as you would washing glass ware etc in the sink ) >>> rinse with clean water and dry thoroughly with lotsa hot air ( ie a hair >>> dryer). >>> >>> Then cross you fingers and try it again. >>> >>> If all is well, coat the PCB is clear acrylic lacquer to help it >>> survive. >>> >> >> It's true that I mentioned brushing away a dead spider. >> >> I wish I'd noted exactly where the spider was. It conceivably was around >> the 200K resistor, which could explain both the failures, and the demise >> of the spider. >> >> Anyone know the resistance of a small spider before it dies from shock? > > > > ** If you see one with three red stripes across its abdomen > > - means it is 2.2 kohms, +/- 20 % ............. Power rating? And what's the pinout? Dave.
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X-Google-Thread: 112d1e,3f5de0c6e381c3d6 X-Google-Thread: 1131b0,3f5de0c6e381c3d6 X-Google-Thread: 103407,3f5de0c6e381c3d6 X-Google-Attributes: gid112d1e,gid1131b0,gid103407,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!t-online.de!newsfeed-0.progon.net!progon.net!goblin3!goblin.stu.neva.ru!lon-transit.news.telstra.net!lon-in.news.telstra.net!news.telstra.net!news-server.bigpond.net.au!53ab2750!not-for-mail From: "David L. Jones" <altzone@gmail.com> Newsgroups: sci.electronics.design,sci.electronics.repair,aus.electronics References: <49601fcc$0$26314$afc38c87@news.optusnet.com.au> <qaa0m4poq9ppo2l7prp91o9bmko9s0mj96@4ax.com> <49602fd0$0$26849$afc38c87@news.optusnet.com.au> <496043b6$0$25649$afc38c87@news.optusnet.com.au> <6sb0fgF54kccU1@mid.individual.net> <4960526e$0$19326$afc38c87@news.optusnet.com.au> <6sb46vF53m30U1@mid.individual.net> Subject: Re: Understanding a split-mode power supply. Lines: 45 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.3138 X-RFC2646: Format=Flowed; Response X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 Message-ID: <By%7l.7507$cu.1138@news-server.bigpond.net.au> Date: Sun, 04 Jan 2009 09:45:05 GMT NNTP-Posting-Host: 124.188.224.162 X-Complaints-To: abuse@bigpond.net.au X-Trace: news-server.bigpond.net.au 1231062305 124.188.224.162 (Sun, 04 Jan 2009 20:45:05 EST) NNTP-Posting-Date: Sun, 04 Jan 2009 20:45:05 EST Organization: BigPond Internet Services