Re: ATX power supply to drive a 12V DC motor?

On 5 Jan 2007 08:04:37 -0800, "MK" <michaelkatsilis@xxxxxxxxx> wrote:

Hi Eric,

I don't want to open the PSU. Can you give an alternative solution
please?

Regards,

Michael

Eric R Snow wrote:
On Fri, 05 Jan 2007 07:53:25 -0800, Eric R Snow <etpm@xxxxxxxxxxx>
wrote:

On 5 Jan 2007 05:36:38 -0800, "MK" <michaelkatsilis@xxxxxxxxx> wrote:

Hi,

I have a 12V DC motor (6A under load). The only power supplies I have
around here are ATX. Someone at an electronics shop told me they can be
used to supply the power, but I didn't ask how. Is it just a matter of
using an IDE connector to power the motor?

Regards,

Michael
Information from the January 2007 issue of Nuts and Volts column
called Electronics Q&A:
Connect a red wire and a black wire with a 10 ohm 5 watt resistor. If
there is a brown wire connect it to the orange wire. Connect the green
wire to a black wire with a switch. This is the on/off switch. Wired
as above the motor can be connected to a yellow and black wire and
turned on and off with a switch without damaging the power supply. If
you want the motor can be connected without a switch and the 10 ohm
resistor eliminated. Then the power supply on/off switch can be used
to turn the motor on and off. If you do this don't connect the red
wire to anything and don't disconnect the motor when the power supply
is on. Make sure all the unconnected wires cannot make contact with
anything. Here's a web site mentioned in the same column about ATX
power supplies:
http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTM
All the above info was gleaned from Nuts and Volts and I cannot take
any credit for it.
ERS
WHOOPS! I forgot to add that if the load resistor is used it needs to
be mounted to a heat sink because it will get hot.
ERS
No need to open up the PS. All the wires come out. Just cut off from
the connector the wires you need. The resistor, if used, can be
mounted to the outside of the PS. Use wire nuts to connect the wires
to your motor, the switch, or each other. I don't know if the on/off
wires need a momentary connection or if they need a continuous one.
Try this: If there is a brown wire cut it from the connector and
connect it to an orange wire. Cut away a black and a yellow wire and
connect to the motor leads. Reversing the wires will reverse a
standard DC motor. Cut away the green wire and another black wire.
Plug the PS into the wall and touch the green and black together
momentarily. If the motor comes on and stays on then buy a momentary
contact switch. If the motor will only stay on with the green and
black wires touching then get a switch that makes constant contact.
Since the above scheme disposes of the resistor do not discionnect the
motor if the PS plugged in. If all the other wires are left in the
connectors they will be unlikely to be able to touch anything. But
just to be sure wrap the connectors with black tape.
ERS
.

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