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From: "Phil Allison"
Subject: Re: Smallest component to step down 240VAC to 18VDC?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Wed, 9 Oct 2002 18:43:34 +1000
NNTP-Posting-Date: Wed, 09 Oct 2002 18:32:06 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"The little lost angel" wrote in
> Are transformers with a AC->DC circuit the only way to step
> down mains AC to low DC voltages? Are there no small IC that can
> convert 240V to something like 16V to 24V range?
> Could I do something like
> 1) AC to DC rectifier(? or converter or whatever?) with four diodes
> (IIRC from high school)
> 2) then split it (a la Kirchoff/Resistive divider) across say 6
> LM117HV (60Vin, adj Vout, 1.5A) to put a nominal 40Vin to each,
> 3) then tie the six 16Vout outputs back to a single output connector?
> Reason being... I lost my 16V 4.5A laptop charger and need to
> make one small enough to pack in my bag. :(
> The wall wart(?) I'm using now is way too big for that.
** I have seen advertised general purpose, small, plastic cased 12 volt
@ 4 amps SMPS available with standard DC plugs for output and IEC inlets
for the AC. Small means 120 x 60 x 36 mm. Also slightly smaller size
adjustable voltage versions, like 9 -15 volts @ 2 amps.
Keep looking - I bet it exists.
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