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Direct from the mains?
Direct from the mains?
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Old 12th September 2008, 09:42 PM   #1
Jonathan Bright is offline Jonathan Bright  Australia
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Default Direct from the mains?

I live in a country with around 240V ac as mains power. I notice that some PSU for small signal tube circuits require around that voltage prior to retification/sabilization etc.. Given that we get 240ac straight "out of the tap", is it possible to dispense with the power supply transformer in these designs? Now be polite please. There may well be very good and obvious technical/legal/safety reasons etc.... it is just an innocent enquiry....ok?

I think my negative ion generator (built from a local mag' design) does this.
"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.
Old 12th September 2008, 10:24 PM   #2
ray_moth is offline ray_moth  Indonesia
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This is not meant as a flame, but in a DIY forum such as this no one with any sense of responsibility is going to agree with doing what you suggest. It's dangerous (and possibly illegal where you live, anyway). If you do a search you'll find it has been discussed here already.

Bottom line: always use a transformer, even if it's only a 1:1 isolation transformer to give the same voltage as the mains.
Old 12th September 2008, 10:36 PM   #3
SY is offline SY  United States
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Direct from the mains?
It is DEADLY DANGEROUS. Don't even think about it. That's why we have a forum rule against it.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

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