Message-ID: <[EMAIL PROTECTED]>
From: "Ken Hjulstrom" <[EMAIL PROTECTED]>
Subject: Re: [SM] Power Supplies
Date: Tue, 11 Mar 2003 00:17:05 -0500
Mark,
>It is very important to supply the correct voltage to the device. Too
>little
>will possibly damage the device, and too much almost definitely will.
>Remember
>that the device itself determines the currrent flow. The operating device
will
>pull the amperage that it needs, and if the supply line or adapter cannot
provide
>enough, then some part of the supply line will be damaged or shut down. The
>most common result of this is that the adapter will blow a fuse if there is
>one,
>or will start smoking and/or burning. Home electric lines have fuses and
>circuit breakers to protect the wiring should too much current be demanded
>of the line. Remember that the amp rating of a power supply refers to the
>maximum amps it can supply; it's not pushing that amperage through every
>device connected to it.
>Hope this helps,
>Ken
Dear Ken,
Your explanation is lucid but I am still puzzled. I understand the
importance of the device having the correct voltage. What exactly then does
the power adapter mean on a Syjet when it reads output "5v-1.0A 12V 0.75A"
? Does the power adapter chose the voltage automatically? On the Radio
Shack or Belkin devices that are sold as replacements, the user chooses
settings. In particular the amperage settings but there is no setting for
2a, only 1.5 or 5 amps. How would you set it? And if your explanation that
the hard drive device draws the amperage that it needs, is correct, then
why did a previous response to my question warn that a device advertised as
supplying up to 5 or (I assume) 5 amp adapter by Radio Shack might indeed
damage the hard drive. When I look at the printer power adapters I become
even more confused, for there they list 30 volt outputs and 400mA to the
device. I understand from the careful reply of a member of the list that
printers use more voltage, but does the 400 mA here mean that the amperage
is much less for the printer than for say a old Zip drive power supply
which draws 1 amp? The Macpower adapter sold by Other World Computer lists
+12V--2A as its output. When the Does anyone have a real experience of
these replacement power supplies?
Mark
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