Rex wrote: > Brooke Clarke wrote: > >> Hi Dave: >> >> Do you have a photo? >> >> It's been my experience that older electronic equipment fails because of >> poor >> connections rather than bad components. For many examples see: >> http://www.prc68.com/I/HaT.shtml >> >> Have Fun, >> >> Brooke Clarke >> >> > > Brook, > > A little off topic from the original thread, but on your referenced > page, in the "Dead CRT Computer Monitor" section, the blown device is > probably a TVS (Transient Voltage Suppressor). My first thought was that > it was a MOV (Metal Oxide Varistor) but the symbol was different. With a > bit of Google, I found this page: > http://books.google.com/books?id=4SkqFozu80MC&pg=PA122&lpg=PA122&dq=schematic+symbol+MOV&source=web&ots=VydlPTFGNA&sig=A8fKQfYQ3Agb0OU8iEMwM9Zhdsc&hl=en&sa=X&oi=book_result&resnum=1&ct=result#PPA122,M1 > > (Wow! What a URL. Good chance it will wrap in the email. If you can't > copy that, it is page 122 in the google online book "Embedded Systems > Design Using the Rabbit 3000 Microprocessor". Seems like a pretty good > description of voltage suppressors if you scroll back and forth a few > pages.) > > So I just thought I'd try to help with the device, as your page still > has it as an open question. Still unknown is the voltage rating and what > caused it to blow. Since you mention it was on the AC mains, there is a > good chance it was just doing what it was supposed to do, and the > voltage should be something a bit greater than the AC input voltage. > > -Rex > > > Dang! Glancing again at the page just after I sent, the symbol IS an alternative form for a MOV, not a TVS. All the rest still applies. -Rex
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