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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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24th Oct 2018, 2:16 pm | #21 |
Heptode
Join Date: Dec 2014
Location: Limerick, Ireland.
Posts: 901
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Re: Voltage divider
But not capacitors and distances between the 0V bus bar and chassis or case metal parts that meet any 250V standard. I have I think five USA sets that are battery mains, and not one meets safety criteria even with isolation RF earthing capacitors replaced even with 2KV parts, though they might all be safe in practice.
I'd only use modern 115V gear that's plastic cased on an autotransformer, nothing vintage and especially if it didn't have an internal isolating transformer. Of course if it's for yourself and you are qualified to decide, then an autotransformer is fine. |
24th Oct 2018, 2:29 pm | #22 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
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Re: Voltage divider
VAPhi? Reference to power factor perhaps? For sinewaves at any rate, power factor is cosΦ where Φ is phase angle between voltage and current. VA*cosΦ is actual watts.
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
24th Oct 2018, 7:26 pm | #23 | |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Voltage divider
Quote:
Neat explanation, Chris. I wouldn't have spotted that the phi was an anglicisation of Φ, as I've never heard the symbol pronounced! Thanks! I found this resource for those less expert than you on the forum, who'd like some more insight. Here's an extract... Power factor calculations
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Al Last edited by Al (astral highway); 24th Oct 2018 at 7:36 pm. |
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