Difference between revisions of "power supply units"
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<span style="background:#ffff00"> </span> YELLOW: +12V. On newer power supplies you may need to attach a 22Ω 10 Watt resistor to GND as a dummy load. Switching power supplies usually need at least some load to operate properly. | <span style="background:#ffff00"> </span> YELLOW: +12V. On newer power supplies you may need to attach a 22Ω 10 Watt resistor to GND as a dummy load. Switching power supplies usually need at least some load to operate properly. | ||
| − | <span style="background:# | + | <span style="background:#ff0000"> </span> RED: +5V. On older power supplies you may need to attach a 5Ω 10 Watt resistor to GND as a dummy load. Switching power supplies usually need at least some load to operate properly. |
<span style="background:#ff8800"> </span> ORANGE: +3.3V | <span style="background:#ff8800"> </span> ORANGE: +3.3V | ||
| − | <span style="background:# | + | <span style="background:#0000ff"> </span> BLUE: -12V |
<span style="background:#8800ff"> </span> PURPLE: +5V standby. This provides low power 5V even when "off". | <span style="background:#8800ff"> </span> PURPLE: +5V standby. This provides low power 5V even when "off". | ||
Revision as of 12:19, 16 December 2011
Obtain an ATX PSU.
BLACK: GND ground
GREEN: Power on. Ground this line to turn ON.
YELLOW: +12V. On newer power supplies you may need to attach a 22Ω 10 Watt resistor to GND as a dummy load. Switching power supplies usually need at least some load to operate properly.
RED: +5V. On older power supplies you may need to attach a 5Ω 10 Watt resistor to GND as a dummy load. Switching power supplies usually need at least some load to operate properly.
ORANGE: +3.3V
BLUE: -12V
PURPLE: +5V standby. This provides low power 5V even when "off".
WHITE: -5V (rare)
GRAY: Power OK signal line. Attach an LED in series with 330Ω resistor for a power ready light.
BROWN: +3.3V remote sense. This may not be necessary for all applications. You should attach this to the +3.3V ORANGE line. The attachment point should be near the load, not just inside the PSU. This allows the PSU to measure the resistance of the power lines leading to the load and fine tune the voltage level. For long power lines the voltage drop can be significant.
