wrote:
On Sun, 25 Nov 2018 16:06:58 -0500, wrote:

On Sun, 25 Nov 2018 15:13:56 -0500, John McGaw
wrote:

On 11/25/2018 11:16 AM, wrote:
I have an old ATEN CS-104 KVM switch that I want to try before I toss
it. But I need the power cord with its AC/DCconverter-I can't find
mine. Anyone know of where I might get/buy same? I don't see
anything on EBAY.

Just hopin'

Pete

Probably this would do that job but you'd have to determine what the total
power consumption of the KVM is first:

https://www.amazon.com/Universal-Ada.../dp/B06ZZMGLJ2

At leasr I can see how the thing connects to AC and it is chaper than
RS @
https://www.radioshack.com/products/...wer-ac-adapter
Thanks
I think I will buy it.
Pete

OHOH
Detrmining voltage looks critical. I sure don't wanna destroy the
KVM. Looke like I may be in deep doodoo here. Dammit.
Thanks
Pete

The input requirement is 9V @ 0.25A .

The product John McGaw picked is 9V @ 1.2A (i.e. OK).

The adapter uses a rotary 7 position switch to select
the desired output voltage. You should feel a little
detent as the switch rotates past each position. With
the arrow pointed roughly at 9, it will give 9.0 volts.
Which is what you want. That's not a potentiometer, and
is not "continuously adjustable". It has discrete voltage
values, and the switch contacts close inside to select
one of the 7 values available.

Your KVM draws 0.25A, which is less than the 1.2A maximum
load the adapter supports. There is plenty of headroom
and that's what you want. You wouldn't want the
converse, like a 1.2A KVM and a 0.25A adapter, because
then the adapter would shut itself off. When the load (0.25A)
is less than the max (1.2A), the adapter provides the 0.25A
you need and not more. It's a rating of capability, rather
than being "shoved in" no matter what.

So the 9V number is the critical one, because the
adapter is a voltage source. That's the one we're
most concerned about matching. And the source and
load are 9V=9V .

Whereas for the current flow value, as long as the
load draws less than the max the adapter is capable
of, everybody is happy.

The hardest part of the job, will be fitting the plug.
And that part, is the unfortunate part of barrel designs.
It's not idiot proof. As an engineer, I don't like to
see designs like that, as it leaves too much to the
imagination. It is possible to make connectors
that resist rotation or reversal or fitting wrong
voltages together. But unfortunately, the 15 different
barrel types, just don't have any purpose.

What you'll normally find, is of the 15 barrel types,
only about 2 are popular for computer electronics. And
those are likely to be in the little kit you're getting.

Another peculiarity, is two of the barrels are damn close
in dimensions. If you're standing in a RadioShack testing
those two, you can't tell which one to buy :-/ I love stuff
like that, knowing they're nominally "different" but not
knowing which I should select. The RadioShack guy wasn't much
help. No, I didn't buy both of them. The two popular barrels
are sufficiently different, you can tell them apart.

Paul