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Old 11th August 2007, 08:38 PM   #21
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Join Date: Nov 2002
Location: Netherlands
Originally posted by Eva
Your layout does not show any safety spacing (5mm recommended) between mains live side and output side.

Originally posted by streetera
Needs at least 8 mm creepage and clearance between input and output (including across opto / isolation barrier and any swtiching XFR)
Nice the pros put up some numbers on safety distance. But the CE regulations demand at least 6 mm creepage and clearance distance for class II and 0.4 mm isolation thickness minimum anyway between the mains parts and touchable LV parts.

Even it is DIY and for you own use (and risk), it is wise to comply with this distances for your own and others safety.

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Old 13th August 2007, 02:39 AM   #22
jaya000 is offline jaya000  India
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Now waiting 4 schematics & pcb layout.
How about power amp project development?
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Old 13th August 2007, 03:52 AM   #23
mzzj is offline mzzj  Finland
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Originally posted by Pjotr

The CE regulations demand at least 6 mm creepage and clearance distance for class II and 0.4 mm isolation thickness minimum

Is cotton tape approved?
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Old 13th August 2007, 03:23 PM   #24
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Default cottom


No fire, no lightning.
Yes, All aproved cottom.
I think there is more fire in the post.
I don´t like some posts. The best will be I will go out/away DIYAUDIO.COM.

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Old 14th August 2007, 01:49 AM   #25
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Old 20th August 2007, 09:19 PM   #26
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Some people dont see DIY electical safety as an aspect of good design. Im different to these, I do. of course I cant make anyone do anything over such a medium as this but I can just ask politely that they inform others of any safety short comings where there are KNOWN to exist. regards A Streeter
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Old 21st August 2007, 02:33 PM   #27
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Default about pcb design

In my smps the voltage is 342VDC input (127VAC with doubler) and the output is around (regulation less) +83/-83VDC and there´s not danger enter primary and secondary tensions. I never have problems with safety clearance because 3mm is very good distance. Remember 1mm/air isolation = 1000VDC , ok?

Bye for all
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Old 22nd August 2007, 10:26 AM   #28
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Then there is moisture, contamination, spikes etc. It is 8mm/6mm for a reason.
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Old 31st August 2007, 08:37 AM   #29
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Thumbs up nice work

Nice work CHACALPOWERS . I was wondering if you could post the schematic of the SMPS. I am also building an smps with sg3525 controller.but mine is 12v to +/-50v 400W.Planning to build a sub woofer amp for car with it.
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Old 1st September 2007, 10:35 PM   #30
aandy is offline aandy  United Kingdom
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Location: in UK unfortunatly
regs are real but thouse of us that do this for a living had to start.

my bigest smps does 12kw and semikron tell me that's small.
mains rectified will all ways give a new man a lesson!
and it hearts!

nice to see a toriodal smps tx also i did one and the big boy told me it would not work,it did
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