PC Power Supply - Power Good line?  
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PC Power Supply - Power Good line? - 1/14/2003 8:38:18 PM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		I have a AT 250watt 9amp power supply. I have sucessfully got it "working" by puting 1 or 2 10ohm/10watt resistors on one of the 5+volt red lines. I have two problems.

1. I have read many times that on the AT PSU, a 5volt line needs to be connected to the "power good" line. Most PSU's power good line is orange. I do not have a orange line and do not know how to determine which line the power good is. I have red, yellow, black, 1 white, 1 brown, 1 blue

2. I am only getting 4.5volts on the 5volt lines (red) and 11.4volts on the 12 volt line (yellow).
What do I need to do to get the voltage up to 5 and 12 respectively?

Thanks for your help
Matt
       Post #: 1

PC Power Supply - Power Good line? - 1/14/2003 9:24:02 PM   
Red Scholefield



Posts: 4868
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline 		You need a heaviery load on the 5 volt line. Try using an 1157 automotive bulb and wiring both elements. This will give you the 2 amp load needed to wake it up.

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PC Power Supply - Power Good line? - 1/14/2003 9:49:58 PM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		Thanks Red.

What about the power good line. Do I need to find it and connect to a 5volt line or maybe it is working without requiring that connection?

thanks
Matt

(in reply to mgmoore7)
       Post #: 3

PC Power Supply - Power Good line? - 1/15/2003 12:22:55 AM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		I decided to try emailing the manufacturer since I found their website and to my amazement they replied within a few hours and told me that the while wire is the power good signal.

I got the light bulbs and will try again tonight to get a full 12 volts.

I also got my triton today which was the reason for making this power supply.

Thanks for your help
Matt

(in reply to mgmoore7)
       Post #: 4

power good wire - 1/15/2003 5:44:42 AM   
voegdmcm


 

Posts: 35
Joined: 12/10/2001
From: Wichita, KS, USA
Status: offline 		Could you please tell us what they said needs to be done with the power good wire? Thanks. Dan

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PC Power Supply - Power Good line? - 1/15/2003 6:08:25 AM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		According to most of the info that I have read:
If you have a AT style PS then you need to put a 2amp load on one of the 5+volt lines with a resistor or auto light bulb and connect the power good line to a 5+ volt line as well.

(in reply to mgmoore7)
       Post #: 6

power good wire - 1/15/2003 6:19:56 AM   
voegdmcm


 

Posts: 35
Joined: 12/10/2001
From: Wichita, KS, USA
Status: offline 		mgmoore7, thanks for the speedy reply. Dan

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PC Power Supply - Power Good line? - 1/15/2003 6:37:51 AM   
Panzlflyer



Posts: 1938
Joined: 2/28/2002
From: Goldsboro, NC, USA
Status: offline 		I humbly disagree.
AT power supplies were deficient in their design with respect to the PG signal and will start regardless or it was simply tied to the 5v internally.
An ATX does require using the Power Good signal.
Depends on the quality and or the Manufacturer

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       Post #: 8

PC Power Supply - Power Good line? - 1/15/2003 6:40:21 AM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		Like I said that is what I have read. My personal experience (only one PS) is that I only need to put a load on one of the 5+ lines and it started right up. I still am not getting a full 12 volts but I think that is because I need more load and I am going to try that right now.

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       Post #: 9

PC Power Supply - Power Good line? - 1/15/2003 6:58:28 AM   
Panzlflyer



Posts: 1938
Joined: 2/28/2002
From: Goldsboro, NC, USA
Status: offline 		Wires crossed...
A load is needed because of the Switching design and the need to stabilize the regulator.
The power good signal is usually required on ATX power supplies as they do not have the usual switch. The switch on ATX comes via the motherboard

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       Post #: 10

PC Power Supply - Power Good line? - 1/15/2003 8:16:32 AM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		[QUOTE]Originally posted by mgmoore7
Like I said that is what I have read. My personal experience (only one PS) is that I only need to put a load on one of the 5+ lines and it started right up. I still am not getting a full 12 volts but I think that is because I need more load and I am going to try that right now. [/QUOTE]


I am now getting 12 volts on the dot with a light bulb and 2 - 10w 10ohm resitors in a series on separate 5 volt lines. If I add a 2nd bulb it only lights up a little but I get about 12.2 volts. I am just going to use one for now.

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       Post #: 11

PC Power Supply - Power Good line? - 1/15/2003 10:08:29 AM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		I am left with one challenge. Where and how do I mount the resistors. Can I mount with some glue to the metal case? What if they are touching something? Thanks. Matt

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       Post #: 12

PC Power Supply - Power Good line? - 1/15/2003 6:43:27 PM   
Red Scholefield



Posts: 4868
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline 		[QUOTE]Originally posted by mgmoore7
I am left with one challenge. Where and how do I mount the resistors. Can I mount with some glue to the metal case? What if they are touching something? Thanks. Matt [/QUOTE]

If you will check your local auto supply store you will find they have a universal bulb socket that will accept an 1154 bulb. This socket is a perfect fit in the hole where all the wires exit the power supply. If you use the 1154 connect BOTH wires to the 5 volt line (red wires - lots of them but you only need one). The socket will be grounded through the case to complete the circuit. It makes a nice clean set up and a load that is big enough to get you a resonable voltage on the +12 volt lines.

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Red S.
AMA 951 Leader Member

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PC Power Supply - Power Good line? - 1/15/2003 6:57:44 PM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		Thanks red. That is exactly what I did with the bulb although I did not buy the socket. I just soldered wires directly to the bulb and wrapped it with some electrical tape. It fit nicely in the plastic housing that held the wires.

My question was actually what to do with the resistors though. I have 2 wired in a series to a red and black wire. Those are what I am concerned about where and how to mount them.

I am starting to wonder though whether they are needed though. I never tested the voltage with just the bulb and without the resistors. They are hardly getting warm to the touch. Maybe I will remove them and test the voltage??

Thanks
Matt

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       Post #: 14

PC Power Supply - Power Good line? - 1/15/2003 7:18:42 PM   
Red Scholefield



Posts: 4868
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline 		[QUOTE]Originally posted by mgmoore7
Thanks red. That is exactly what I did with the bulb although I did not buy the socket. I just soldered wires directly to the bulb and wrapped it with some electrical tape. It fit nicely in the plastic housing that held the wires.

My question was actually what to do with the resistors though. I have 2 wired in a series to a red and black wire. Those are what I am concerned about where and how to mount them.

I am starting to wonder though whether they are needed though. I never tested the voltage with just the bulb and without the resistors. They are hardly getting warm to the touch. Maybe I will remove them and test the voltage??

Thanks
Matt [/QUOTE]

If you wire both elements of the bulb it does not appear that the resistors are required. At least on the two I modified just the bulb worked fine.

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Red S.
AMA 951 Leader Member

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PC Power Supply - Power Good line? - 1/15/2003 7:43:13 PM   
mgmoore7


 

Posts: 114
Joined: 7/29/2002
From: Tampa, FL, USA
Status: offline 		[QUOTE]Originally posted by redscho


If you wire both elements of the bulb it does not appear that the resistors are required. At least on the two I modified just the bulb worked fine. [/QUOTE]

"both elements of the bulb"

I am not sure that I understand this. Do you mean the two contact points on the bottom of the bulb? I figured that they were the same. I only wired one contact point with one wire and one wire to the side of the bulb. If I need to wire the second contact, do I use a second red wire or wire both contacts to one wire?

Thanks so much.

I never new that I would learn so much from doing this project. I have really enjoyed this.

Thanks, Matt

(in reply to mgmoore7)