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On Saturday, August 22, 2015 3:19:50 PM Alan Grimes wrote: |
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> Isn't this the filthiest oscilloscope u've seen recently? |
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> |
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> The only bare metal contact that I could safely use to get a reading off |
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> was a +12v line on a spare PCI-E gpu plug. The ground reference is the |
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> chassis. |
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> |
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> You can see the machine's settings in the photo clearly enough. The |
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> waveform is fairly constant, it stays in this mode most of the time but |
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> sometimes goes into a "low ripple" mode where the ripple falls to +/- |
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> 20mv and holds tight. The scaling indicates the upward spikes are around |
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> 0.120 volts and the downward spikes are about 0.22 volts. This |
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> __SHOULD__ be within the input tolerances of the motherboard's regulators. |
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|
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Regulators don't filter noise, they introduce it. Capacitors do that as |
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somebody pointed on the other thread. |
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|
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So if you're on a tight budget and you have an electronics surplus store |
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nearby you can replace all the capacitors on your mobo and PSU (except the big |
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bulky ones on the PSU) for about $3. |
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|
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> I would call this PSU marginal, it absolutely does power the machine but |
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> it's noise output is a bit larger than what I would prefer. |
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> |
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> Given that i'm flat on my ass broke with a foreclosure over my head, I |
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> am powerfully inclined to continue to live with the PSU the way it is |
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> now until it is no longer possible to do so. |
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> |
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> I had to use my windows 7 machine to get the photo off my camera because |
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> digikam does not compile. =| |
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> |
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> |
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|
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-- |
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Fernando Rodriguez |
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