Diy power supply from an old computer psu - Revision history

Mol: /* Power Switch */

2023-06-11T06:25:13Z

Power Switch

← Older revision		Revision as of 09:25, 11 June 2023
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	* Pink: +5V sense (sometimes)		* Pink: +5V sense (sometimes)
	* Yellow (small gauge): +12V sense (rarely)		* Yellow (small gauge): +12V sense (rarely)

			=== Safety Features ===

			* Short circuit Protection?
			* Over load Protection?
			* Over Heat Protection?


	=== Power Switch ===		=== Power Switch ===

Mol: /* Wire Coloring */

2023-06-11T06:22:01Z

Wire Coloring

← Older revision		Revision as of 09:22, 11 June 2023
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	* White: -5V (on older ATX power supplies)		* White: -5V (on older ATX power supplies)
	* Red: + 5V		* Red: + 5V
	* Purple: +5V standby
	* Blue: -12V		* Blue: -12V
	* Yellow: +12V		* Yellow: +12V
	* Gray: power is on indicator		* Gray: power is on indicator
	* Green: ON/OFF switch; turn DC on by shorting to ground.		* Green: ON/OFF switch; turn DC on by shorting to ground.
	* Brown: ~~Voltage~~ sense (on newer power supplies)		* Purple: +5V standby
			* Brown: +3.3V sense (on newer power supplies)
			* Pink: +5V sense (sometimes)
			* Yellow (small gauge): +12V sense (rarely)

	=== Power Switch ===		=== Power Switch ===

Mol: /* Current */

2023-06-11T06:14:53Z

Current

← Older revision		Revision as of 09:14, 11 June 2023
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	12 V and 5 V.		12 V and 5 V.

	=== Current ===		=== Current on Voltages ===


			The possible outcomes are 24V (+12, -12), 17V (+5, -12), 12V (+12, GND), 10V (+5, -5), 7V (+12, +5), 5V (+5, GND), 3.3V which should be sufficient for most electrical testing.

	=== Wire Coloring ===		=== Wire Coloring ===

Mol: /* References */

2023-06-11T06:13:14Z

References

← Older revision		Revision as of 09:13, 11 June 2023
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	== References ==		== References ==

			https://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply

Mol: /* Wire Coloring */

2023-06-11T06:13:05Z

Wire Coloring

← Older revision		Revision as of 09:13, 11 June 2023
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	* Blue: -12V		* Blue: -12V
	* Yellow: +12V		* Yellow: +12V
	* ~~Grey~~: power is on indicator		* Gray: power is on indicator
	* Green: ON/OFF switch; turn DC on by shorting to ground.		* Green: ON/OFF switch; turn DC on by shorting to ground.
	* Brown: Voltage sense (on newer power supplies)		* Brown: Voltage sense (on newer power supplies)

Mol: /* +12V */

2023-06-11T06:12:47Z

+12V

← Older revision		Revision as of 09:12, 11 June 2023
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	Connect the remaining yellow wires to the +5V binding post: solder them all together and solder them to the +12V binding post.		Connect the remaining yellow wires to the +5V binding post: solder them all together and solder them to the +12V binding post.

			=== GND ===

			Connect the remaining black wires to the ground binding post.

	== References ==		== References ==

Mol: /* +3.3V */

2023-06-11T06:11:54Z

+3.3V

← Older revision		Revision as of 09:11, 11 June 2023
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	* If you only have two or less orange wires, you should also have a '''brown wire''' which must be connected with the orange (Some newer power supplies will have "voltage sense" wires that need to be connected to the actual voltage wires for proper operation).		* If you only have two or less orange wires, you should also have a '''brown wire''' which must be connected with the orange (Some newer power supplies will have "voltage sense" wires that need to be connected to the actual voltage wires for proper operation).


	=== +5V ===		=== +5V ===

Mol: /* Wire Coloring */

2023-06-11T06:11:29Z

Wire Coloring

← Older revision		Revision as of 09:11, 11 June 2023
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	* Grey: power is on indicator		* Grey: power is on indicator
	* Green: ON/OFF switch; turn DC on by shorting to ground.		* Green: ON/OFF switch; turn DC on by shorting to ground.
			* Brown: Voltage sense (on newer power supplies)

	=== Power Switch ===		=== Power Switch ===

Mol: /* References */

2023-06-11T06:10:46Z

References

← Older revision		Revision as of 09:10, 11 June 2023
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	Consider using a lighted 12V switch, which will act as the load necessary to turn on the power supply, or replace the 10W power resistor with the cooling fan that was originally inside the PSU, be careful with the polarity though - match the red and black wires to each other.		Consider using a lighted 12V switch, which will act as the load necessary to turn on the power supply, or replace the 10W power resistor with the cooling fan that was originally inside the PSU, be careful with the polarity though - match the red and black wires to each other.

			=== +3.3V ===

			Connect the remaining orange wires to the +3.3V binding post: solder them all together and solder them to the +3.3V binding post.

			* Gray/ White: Some power supplies may have either a gray or brown wire to represent "power ok". (Most PSU's have a '''smaller orange''' wire that is used for sensing and this wire is usually paired at the connector to another orange wire. Make sure this wire is connected to the other orange wires, otherwise your lab power supply won't stay on.) or a red wire (+5V) for the power supply to function. When in doubt, try the lower voltage first (+3.3V).

			* If you only have two or less orange wires, you should also have a '''brown wire''' which must be connected with the orange (Some newer power supplies will have "voltage sense" wires that need to be connected to the actual voltage wires for proper operation).


			=== +5V ===

			Connect the remaining red wires to the +5V binding post: solder them all together and solder them to the +5V binding post.
			* If there is only three red wires, another wire (sometimes pink) must be connected to them.

			=== +12V ===

			Connect the remaining yellow wires to the +5V binding post: solder them all together and solder them to the +12V binding post.




	== References ==		== References ==

Mol: /* Wire Coloring */

2023-06-11T06:01:21Z

Wire Coloring

← Older revision		Revision as of 09:01, 11 June 2023
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	* Black: Ground (0V)		* Black: Ground (0V)
	* Orange: +3.3V		* Orange: +3.3V
	* White: -5V		* White: -5V (on older ATX power supplies)
	* Red: + 5V		* Red: + 5V
	* Purple: +5V standby		* Purple: +5V standby