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Massive WTF !

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infrasound View Drop Down
Old Croc
Old Croc


Joined: 13 May 2011
Location: Brizzle
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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Topic: Massive WTF !
    Posted: 31 October 2011 at 12:46am
Right, here's one for you guys to try and work out what the hell is going on here.

My (new) small SMPS that I use for active monitor duties is playing up. Bigtime. It's output voltage is around 50% higher than it should be, at 75vDC instead of 50vDC. The adjustment allows ±20v rail swing, from 55vDC to 95vDC (!) - instead of 30v-70v.

First thing that occurred to me was that it was buggered. Metered the mains input on the PSU and it came to 330vAC.

What the hell I think, how is everything not fried in this room! I go and test the socket, and its 242vAC. The mains input on the PSU- 340vAC and climbing??


WTF.
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infrasound View Drop Down
Old Croc
Old Croc


Joined: 13 May 2011
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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Posted: 31 October 2011 at 12:47am
Update: Now on 365vAC and climbing, expecting something to give soon!
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infrasound View Drop Down
Old Croc
Old Croc


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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Posted: 31 October 2011 at 12:52am
Definitely just discovered free energy Big smile
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haloweenhamster View Drop Down
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Joined: 24 January 2010
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Post Options Post Options   Thanks (0) Thanks(0)   Quote haloweenhamster Quote  Post ReplyReply Direct Link To This Post Posted: 31 October 2011 at 6:34am
Sounds like a switch mode to me
all switch mode supplys I have scoped input or output to ground fluctuates from 300-380vac at 400-500khz
2x court top horn 2" + 1" loaded
2x court mid horn 12" loaded
2x ass mt1200 10" + 2" + bullets
2x court W bins 15" loaded
1x/3x TAS sub 18" loaded
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tomschute View Drop Down
Old Croc
Old Croc


Joined: 15 May 2006
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomschute Quote  Post ReplyReply Direct Link To This Post Posted: 31 October 2011 at 7:55am
Originally posted by infrasound infrasound wrote:

Definitely just discovered free energy Big smile


was gonna say wouldn't be advertising this - the coats will be round soon!
Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk
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