From: Jim Thompson
Subject: Re: Smallest component to step down 240VAC to 18VDC?
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
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Date: Wed, 09 Oct 2002 17:36:57 GMT
NNTP-Posting-Date: Wed, 09 Oct 2002 13:36:57 EDT
Organization: Cox Communications
On Wed, 09 Oct 2002 17:04:02 GMT,
firstname.lastname@example.org (The little lost angel),
In Newsgroup: sci.electronics.design,
Entitled: "Re: Smallest component to step down 240VAC to 18VDC?",
Wrote the following:
|On Wed, 9 Oct 2002 18:41:21 +0200, "fred bartoli"
|>Just because :
|>- your laptop will be *DIRECTLY* connected to mains without isolation. Just
|>a good way to kill yourself.
|>- 120V (mains) * sqrt(2) (rectification + cap) = 170V; then (170V-16V) *
|>4.5A = 690W to keep you hot in case your laptop couldn't succeed in making
|>you cold for the rest of your brand new eternal life...
|I don't quite understand this isolation part.
|The 230VAC comes in, the diode rectifier would change it to 230VDC
|Then spread across 10 (okay 6 might had been too little) regulators,
|each of them drops 7V, and puts out 16V to the laptop. If the laptop
|draws the full 4.5A, then the regulators would be burning something
|like 25W, which isn't too much right?
|L.Angel: I'm looking for web design work.
|If you need basic to med complexity webpages at affordable rates, email me :)
Just buy the right adapter... otherwise you *ARE* going to fry
yourself, although, looking on the positive side, you could earn a
Darwin Award ;-)
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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