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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 7th Sep 2016, 4:53 pm   #81
Al (astral highway)
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Default Re: The deeper mysteries of 'ground'?

Thank you, David. That's interesting and helpful.

I won't, on reflection , safety earth the secondary negative rail. Only the transformer cores, RFI suppressor case and high-voltage cap cases will be safety earthed, along with any protruding external hardware connected to any of these.
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Old 7th Sep 2016, 8:15 pm   #82
Lucien Nunes
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Default Re: The deeper mysteries of 'ground'?

Out of interest, what is the highest voltage that would appear across the isolating transformer insulation if any arbitrary point in the HV generator became earthed?
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Old 7th Sep 2016, 9:13 pm   #83
Al (astral highway)
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Default Re: The deeper mysteries of 'ground'?

Quote:
Originally Posted by Lucien Nunes View Post
...what is the highest voltage that would appear across the isolating transformer insulation if any arbitrary point in the HV generator became earthed?
Hey Lucien, without getting bogged down in figures, it's exactly the same circuit design as used in a standard microwave oven, except using the much-discussed mercury rectifier instead of silicon. Crucially, the transformer is taken from a scrap microwave oven so is designed to stand-off the appropriate voltage continuously.

Another minor difference is that the valve will have its own filament transformer, taken from another (commercial) microwave oven.
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