AC Input to DC Chargers

[Richard Hallett]

Read the side of the unit for output capacity.

Put a load of a couple of amps as a resistor or bulb or something on the
5volt red wire to black. Output is determined by the load on the 5 volt line
which is the important line in the computer.  Output on yellow wire to any
black ground will now be increased to about 12 volts and should work for
your use.  Blacks are ground yellow is twelve volts and red is five volts

If it is an ATX supply you will also have to short the green wire going to
the main board to a black wire.

All this can be done without entering the case of the pc supply.

Much more can be done if you are qualified to work high voltage live .  If
you don't know what this means leave the cover on the supply and just use
the suggestions in the preceding.  Internal voltages are lethal and much of
it is not isolated.

Rick
----- Original Message -----
From: "Ted Sander" <tedsander at attbi.com>
To: <discussion at nsrca.org>
Sent: Saturday, February 15, 2003 10:20 AM
Subject: AC Input to DC Chargers


>
>
> Veering a little off thread about battery chargers, has anyone adapted a
PC
> power supply to feed any of these chargers on the bench?  Any cautions to
be
> aware of?  Seems like most chargers are made for 12V input - great at the
> field, not so handy on the bench unless you spring for the high priced
> add-on.  Obviously, we're talkin' enough input capacity for TX and RX
> batteries here, not mega-cell electric flight.  I've got two or three old
> dead PC's peeking out from under the workbench.....
> Going further, any advice on converting these power supplies to a
reasonably
> accurate variable output?  My TX lets me calibrate it's built in volt
meter,
> but you need stable, varying amounts of dc voltage to do it.  I'm tired of
> driving across town to borrow my friends regulated power supply, plus
having
> my own would come in handy for other projects.  (But not enough demand to
> justify buying one).  Any web resources about this?
>
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