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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
A friend of mine used some for rectification of a current limited HV transformer, but he didn't know that the diodes need to be rated at Vpeak-peak for half wave rectification. The diodes supposedly got so hot that they desoldered themselves, but still worked afterwards.
The use of avalanche diodes would make sense as I believe there are several dies in series. Making series stacks of MW diodes would then be easy without any ballancing circuits. What do you think?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I think it would be easier to just buy a single diode.
I think probably pretty much any diode would do something interesting when biased near to its reverse breakdown voltage and exposed to radiation. Even non-avalanche-rated diodes (1N4007 etc) can withstand a small current in the avalanche mode.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Probably not, tube rectifiers in TVs were obsolete before automatic shutdown circuits were introduced. Tube TVs protected against X-rays by using a thick leaded glass envelope for the rectifier tube.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Heh.
OK so it doesen't actually detect X-rays but senses excess HV that can cause X-ray emission and also crack the glass. Thats intriguing..
Wonder why they used to put a warning on camcorder viewfinders when the HV was below 3.5KV even in the event of total HV runaway? I once tried this and overran one with a bad vertical output to 14V in and the HV only went up by an estimated 10%.
(scuttles off to go and find the salvaged B/W CRTs to see if they have a warning label too)
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Are microwave oven diodes avalanche diodes?
