Re: fried Boom Box

From: Stan (stanleyh_at_delete-this-crap-xprt.net)
Date: 01/28/05


Date: Fri, 28 Jan 2005 10:50:37 -0800


"StanŽ" <spammen@spamworld.it> wrote:

}[CUT]
}
}Those portable stereos do have a simply transformer. It in many cases have
}only one secondary which usually is about 8 VAC @ 20-30VA. Yeah, simply
}transformers (no switching) can overheat and burn when used to a different
}HZ frequency
}DANGER : You may ask for the tension/frequency of the state U are going.
}Examples :
}AMERICA/CANADA (excluding South America) 110V @ 60HZ
}NEW YORK SUBNET 600V @ 400HZ

????

Are you saying that somewhere in the state of New York the power at home
wall outlets is 600V @ 400HZ?

If so, cite reliable references please.

Stan.



Relevant Pages

  • Re: Laptops being "dual-voltage"?
    ... It's true that a cheap TRANSFORMER power supply designed for 60Hz may well overheat on 50Hz. ... However, all laptop power supplies are "switching" power supplies, which are incredibly indifferent to the AC line frequency, since the very first thing that they do is full-wave rectify it and minimally filter it to DC, without a transformer or any ... A cheap powersupply designed for 60Hz will more than likely overheat and fail on 50Hz (if you don't believe me, buy a cheap one from R'shack and try, or just buy an electric toothbrush not specified for 60Hz and try it in Europe. ...
    (comp.sys.laptops)
  • Re: topology suggestions for 3.5kW batt charger?
    ... of now he does have a 240V/20A circuit for this purpose which, ... quasi-resonant switching; ZVS or ZCS? ... Voltage regulation needs to be ... transformer. ...
    (sci.electronics.design)
  • Re: amplifier redux
    ... filter on the output nof your power supply. ... I thought the switching supplies COULD supply all the current needed. ... The gaps are the responsibility of the capacitors. ... If you're asking, why not eliminate any kind of transformer, and connect the ...
    (rec.audio.pro)
  • Re: common mode transients through transformers
    ... and I am having some problems with common mode transients from ... transformer and into the isolated primary ground. ... I am using 20ns mosfet switching on the Hbridge right ...
    (sci.electronics.design)
  • Re: Very Hot Power Cord to Laptop
    ... First, the transformer creates some heat as the windings have resistance, and some current is induced and flows in the iron laminated core of the transformer. ... A switching power supply works totally differently; the incoming AC is full wave rectified to DC, then the DC is switched on and off at a very high frequency as a "square wave" passed to the primary of a pulse transformer. ...
    (alt.sys.pc-clone.dell)