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In Reply to: RE: With JULI@ as digital only why not cut the 3.3 V traces also? posted by rickmcinnis@dogwoodfabrics.com on July 28, 2010 at 20:05:38
Sorry to call you by your last name on my last note.
Don't know what I was thinking.
Would you mind connecting a voltmeter to your JULI@'s power supply leads and measuring the voltage when you turn your machine off?
I have checked everything possible and am 99% sure I have no leakage from JULI@'s 5 volts tabs into the MB, yet when I turn off the machine my voltage will drop as if it is being sinked into the MB. I cannot imagine what would cause this.
Not having any problems with the machine coming up tonight. Running fine though I am still needing to install another (higher voltage)transformer to get the voltage right. I have no idea of how it sounds but it runs fine with 4.5 volts. Using my traditional choke input supply the voltage goes all over the place at start up but settles down to a solid reading.
With traditional supplied one must do some experimenting to get the voltages right. Next thing to try is a nine volts secondary. Hope that is the one.
Not sure if your regulated supply will eliminate what I observe at turn off but when the mood strikes I would appreciate you seeing what happens.
If there is not voltage change, maybe you could do a current measurement?
(I thought while I was asking ...)
Thanks,
Rick McInnis
Follow Ups:
Rick,
I had a memory (they are coming less often as I gain seniority) of doing this measurement about a year ago.
I found it.
Here's what I recorded:
Juli@ 5v PCI
73.7 mA computer off
147.8 mA on computer on in cMP mode
189.2 playing music
Again, I'll confirm these measurements this weekend, but this is what I got a year ago.
Greg in Mississippi
Everything matters!
LOL again.
Rick, calling me 'Stewart' is not a problem and works too... I'm not too picky about things like that.
I can make that measurement, likely this weekend, but might get to it Friday night. In my setup, since I have the 5v fed from a regulated supply, measuring the current will give you the best information, since the voltage will stay at 5v no matter what. But if the current rises with the motherboard off, that may shed some light on what you're seeing. It's easy to do on my setup, just unsolder two wires and insert a meter set to measure current.
Will let you know what I see.
Everything matters!
I am impressed with your note keeping and your files.
Your measurements do point to something going wrong.
I looked for problems extensively last night and could not find anywhere the "voltage" could be leaking out of the board into the MB. (as I said)
Very confusing.
Of course, I need to get it connected and hear it. If it sounds OK I guess it is fine (?).
No need to set all of that up again for measuring. I have confidence in your numbers. You are very kind to offer and this is appreciated.
I am of the opinion that when one takes copious notes this does lessen the importance of memory and the brain is at the ready to work a little less hard. So your good habits are what is to blame for what you think is a function of age. Of course, if we did not take notes we would not have got where we are, so as with everything with every gain there is a loss. One has to choose their compromises and consequences of those decisions . Just like designing an amplifier or speaker. One is either frustrated or satisfied.
I am fifty five though I prefer to think I have celebrated my thirty-eighth eighteenth birthday and when the memory seems to fail I figure it is the same as an HDD getting full and in need of de-fragmentation. Please humor me.
As close as you are I would like to take a drive to hear what you are up to. (how's that for inviting oneself?)
Thanks again for the help and your experiments!
Rick McInnis
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