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Old 16th May 2009, 12:40 PM   #1081
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Hi Andrew.

To get a better view than these pictures I would have to pull the amp apart, not my idea of a good weekend. The power supply that that these parts are taken from spent years plugged into a wall with no problems. If these parts are rated to 400V and are safety approved parts why would there be any problem using them with a 300V transformer?
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Old 16th May 2009, 12:50 PM   #1082
AndrewT is offline AndrewT  Scotland
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I did not refer to 300V.
What are you referring to?
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Old 16th May 2009, 01:00 PM   #1083
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very nice work ~D'Evil~ SPb -, and not only the electronics. I see you make very good photo's also. What kind of camera you use?
Thanks, Wim.

Just 3.2Mpx Canon Powershot A75
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Old 16th May 2009, 01:50 PM   #1084
VLSI is offline VLSI  Australia
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Hi Andrew

This capacitor thing is getting very technical, nice to know we are all very safety conscious.
Have a look at this and lets us know what you think.
http://my.execpc.com/~endlr/line-filter.html
(first hit that came up at google and I only had a quick look at the article)
I notice from the pictures the blue things (ceramic) 2200pf (0.0022uf) are X1 Y2 (impulse tested to 4 & 5 kV) higher than X2?
Note X1 and X2 are usually film used across L & N while Y1 & Y2 are usually ceramic for L & N to ground limited to a maximum of 4700pf as leakage above this value and an earth failure could could result in an electric shock.
I'm off now to look for a paper on the whole mains capacitor safety standards thing.
Regards to all.
Greg
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Old 16th May 2009, 02:26 PM   #1085
AndrewT is offline AndrewT  Scotland
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as soon as anyone enters DIYanything, one must know the risks and how to minimise them. Anything else is criminal.
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Old 16th May 2009, 04:34 PM   #1086
troystg is offline troystg  United States
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Quote:
Originally posted by AndrewT
as soon as anyone enters DIYanything, one must know the risks and how to minimise them. Anything else is criminal.

Absolutely, positively correct!!

It is each builders responsibility to KNOW before they build. Mains voltages and tube supplies can kill instantly. Caps popping in your face can blind and disfigure.

Safety first, ALWAYS.

If in doubt, ask questions. Plenty of good people here who will answer. This is a great forum and we are lucky to have it.
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Old 17th May 2009, 02:09 AM   #1087
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I agree with you all with reguards to safty. I did not know that the caps on the mains where the right ones for this project. I just assumed that they would be ok as they worked well in this role previously. This could be very risky.

As for the moment should I pull them out?
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Old 17th May 2009, 03:10 AM   #1088
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Quote:
Originally posted by Mike-Toronto

As for the moment should I pull them out?

They are properly rated - leave them in.
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Old 17th May 2009, 03:31 AM   #1089
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Thanks will do.
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Old 17th May 2009, 04:42 PM   #1090
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I had decided to take the time to read through this today as I had more time as I do during the week. Thank you all for the feedback and information. Since building this project I have become much more interested in building other kits. I am in no hurry and will take some time to get a better understanding of basic electronics. In regards to the caps on the MAINS. I did know enough to understand why the caps where there. I have been working with professional audio equipment for over a decade now and have dealt with several power conditioners. This being said I do not have the slightest clue as to what most of the information on the parts mean.

All of you have helped drive the safety nail further into my way of thinking. It is not just me that I am putting in harms way.

All the best
Mike
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