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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

    Tim Wescott
    Control systems and communications consulting

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
    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
    PGP Key:
    Version: GnuPG v1.4.3 (MingW32)

    -----END PGP SIGNATURE-----
  4. Dave.H

    Dave.H Guest

    I'll have a look at Dick Smith Electronics.
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