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G0EJO > TECH 21.07.03 00:28l 25 Lines 1181 Bytes #999 (0) @ WW
BID : 000209199PZT
Read: DB0FHN GUEST OE7FMI
Subj: 12V to laptop supply converter
Path: DB0FHN<DB0RGB<DB0FSG<DB0GAP<DB0BOX<DB0MRW<OK0PKL<OK0PPL<RZ6HXA<HA3PG<
WB0TAX<GB7ESX<GB7MAX<GB7PZT
Sent: 030719/1959Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:20900 XSERV407i
Date: Sat, 19 Jul 2003 19:59:26 +0000
From: g0ejo@gb7pzt.#24.gbr.eu (Geoff)
To: tech@ww
Subject: 12V to laptop supply converter
Hello all,
Just bought today from Maplin electronics a "Auto DC Power Regulated Adaptor"
made by Vanson (maplin code N58AC) at the special offer price of 19.99GBpounds.
What I find interesting is that it seems very efficient, more than I would have expected for this type of thing.
My notebook computer requires 19V @ 3A and running this converter from the shackpsu of 13.8V shows that it gets barely detectably warm. As the unit is quite smll - it fits easily in the palm of your hand - I wondered what sort of
techique they use for conversion. Does anyone in packetland know?
(technique)
I would guess that as the output is above the input voltage, it may be an isolated type smpsu with its output "stood on top" of the incoming 12V. Thus to acieve(achieve) 19V output it would only need to produce 7V to add to the original
12V. Even so, It seems very good at doing it.
(I've just noticed another error above - I can't edit after typing with
this system. The Maplin code should be N59AC )
Cheers.
Geoff G0EJO Bournemouth
G0EJO @ GB7PZT
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