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On 6/22/2011 2:27 PM, wrote:

You will want an older xt/at style supply, not the newer ATX, if you
want it to be "simple"

The proper ATX supply is sufficiently simple. It should also have an
on-off switch, which some ATX supplies have.

1. The 3.3V sense wire (orange or brown) which will be connected to one
of the orange 3.3V power wires on the connector before the connector is
cut off (probably pin 11) needs to be reconnected to a +3.3V wire after
the ATX connector is cut off.

2. PS-ON (green, pin 14) needs to be connected to ground.