Re: [PLUG] SCSI cases

[Paul <paul@dpagin.net>]

To which pin would you connect the power-on LED?

It sounds like a 5ohm, at /least/ 5W, resistor would work for testing. 
Testing should only happen briefly anyway.

Connecting the resistor to a drive cable is a good idea.  That way if 
power supply is being tested the resistor can be added.  If the power 
supply is used for something like a drive case the resistor can be 
removed.  That can't be done with an integrated tester.

I used to start up AT power supplies without loads.  Of course the 
voltage was off, but they never had a problem.  Why is it a problem with 
ATX supplies?


Tom wrote:

> The load from Cyberguys may be a 25 Watter, I can't tell from the photo.  The 
> 5.4 Ohm would work on the 5V line.  The design of the power supplies requires 
> a load on the 5V line only.  The +/- 12V & -5V lines are controlled by the 5V 
> line so they don't need a load to regulate them.  I have an AT supply running 
> at home with a PC-104 CPU board on it.  I "obtained" a 5 Ohm, 25 W resistor 
> from my former employer.  The 12V lines and -5V stay well within tolerance 
> with no loads on them.  
>  
>
>  

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