....I swear I made this thread already...
Anyways, I bought a CDV-700 geiger counter off ebay and ended up getting it free because it has a problem.
When turned on it works fine and all for a few minutes, then the high voltage dies and the tube loses power. Turn it off, wait a minute and switch it back on. You get it briefly.
Anyways, something seems to be not happy that it's warmed up. I'm immediately suspecting the capacitors.
Aside from C2 which is a 3v 400uf axial for the meter and C3 which is part of the clicker circuit I'm looking at C1, C4 and C5 which are ceramic disc capacitors. So I replaced those and now I get no high voltage at all. Put the old caps back in....no high voltage with those now too, wtf?
(my replacement caps are the ones at the bottom)
Looking at the schematic these capacitors are polarized...but they're discs. They shouldn't be polarized....are they?
Anyways, I bought a CDV-700 geiger counter off ebay and ended up getting it free because it has a problem.
When turned on it works fine and all for a few minutes, then the high voltage dies and the tube loses power. Turn it off, wait a minute and switch it back on. You get it briefly.
Anyways, something seems to be not happy that it's warmed up. I'm immediately suspecting the capacitors.
Aside from C2 which is a 3v 400uf axial for the meter and C3 which is part of the clicker circuit I'm looking at C1, C4 and C5 which are ceramic disc capacitors. So I replaced those and now I get no high voltage at all. Put the old caps back in....no high voltage with those now too, wtf?
(my replacement caps are the ones at the bottom)
Looking at the schematic these capacitors are polarized...but they're discs. They shouldn't be polarized....are they?
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