On Mon, 23 Jul 2012 09:05:41 -0700, "Guv Bob"
wrote:

I need to replace an AC adapter that went out.

What device is this adapter powering?

Original is 12V 225mA. I have several 12V 1000mA.
Any problem using 1000mA rated unti with 225mA machine?

12V AC or DC?

Assuming DC, no problem if your unspecified device does not require
regulated power. Some power supplies have internal regulators. This
is very common with 5.0VDC adapters. Not so common with 12VDC
adapters, but still possible. If your adapter looks and feels like
it's just a big transformer, with just a diode inside, the replacement
is fine. However, if it looks like a switching power supply or the
unspecified device lacks an internal regulator, you'll eventually have
a problem with an unregulated adapter.

If AC, there's no such thing as a regulated AC wall wart so there
should be no problem substituting a high power adapter.

If DC, also, check the polarity on the DC power connector. Panasonic
phone devices and computah powered speakers sometimes use positive
grounds.

If DC, I usually don't have many failures with transformer operated AC
adapters. If they get hot, they may blow a thermal fuse, but that
takes real effort. However, switching regulators are another story.
For example:
http://802.11junk.com/jeffl/pics/repair/slides/Motorola-2210-02-PS.html
http://802.11junk.com/jeffl/pics/repair/slides/2Wire-power-supply.html
They're smaller, lighter, more efficient, cheaper, and turn off
without a load, but fail far more easily and more often.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558