>I have a Practical Peripherals 14.4 modem that someone passed on to me. It
>came minus the power brick. I want to test it, before I chuck it to the
>electronics recyclers.
>
>It says on the modem that it is "rated" for 9VDC 1000mA output. I have lots
>of spare AC/DC converters, but none that fit that output spec exactly.
If anything it's input, not output. Make sure the polarity is
correct, either center positive or center minus. This is usually
shown as an open circle with a dot in the middle. If it's center
plus a line connects the dot to a plus sign and the circle to a minus
sign.
>
>Forgive my ignorance of basic electronics, but what happens if I use it
>with, say, a 9V 900mA brick? 2.8A? Risk of fire|shock|explosion|Kentucky
>fried circuits? Is that spec min, max, or does it have to be exact?
The 900mA PS will probably work, at least for testing. Prolonged use
could lead to failure though.
The 2.8A PS will probably be okay. The problem with this one is that
since the load is quite a bit below the power supply's rated output
the voltage may be to high. The output voltage of a cheap wall wart
drops a lot with load. So while it may be rated at 9V at 2.8A it's
open circuit voltage could be more like 15V. At 1A it might be down
around 11-12V. This probably won't damage the modem but it's
impossible to say.
--
Clark Martin
Macintosh Consultant
Another designated driver on the Information Super Highway
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