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240 Volt AC To 12 Volt DC

Discussion in 'Electronic Basics' started by Dave.H, Dec 7, 2007.

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  1. Dave.H

    Dave.H Guest

    I was wondering if it was possible to build a power supply that steps
    the 240 Volts AC mains to 12 volt DC 200 mA. I know I could use a
    wall transformer, but that would be to bulky for my little Tunecast II
    FM Transmitter.
     
  2. Tim Wescott

    Tim Wescott Guest

    You basically have the choice of using a transformer-rectifier-regulator
    supply, which will pretty much be a wall wart, or using an off-line
    switcher. In the US the wall warts have all gotten smaller because
    they're off-line switchers now -- has this not happened in the 240VAC
    countries?

    --
    Tim Wescott
    Control systems and communications consulting
    http://www.wescottdesign.com

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
    Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
     
  3. -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    I'd say about half of the wall warts I have in the UK are switchers. It's
    only the _really_ cheap stuff that still has a transformer in.

    My advice to the OP is to get a phone charger that outputs 9v DC - that
    little gizmo will happily run from it. They're cheap enough and nearly
    all are switchers.

    - --
    Brendan Gillatt
    brendan {at} brendangillatt {dot} co {dot} uk
    http://www.brendangillatt.co.uk
    PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
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  4. Dave.H

    Dave.H Guest

    I'll have a look at Dick Smith Electronics.
     
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