P
patrick
Chinese copy, $3.99 on sale:Christopher said:You could do a lot worse than this example:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=25412&item=3830665168
Chris Pollard
http://www.harborfreight.com
Chinese copy, $3.99 on sale:Christopher said:You could do a lot worse than this example:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=25412&item=3830665168
Chris Pollard
Based on the anecdotal evidence, I'd guess that some testers are only
checking for any voltage on a specified "pin," rather than precisely
measuring it, else a false positive with 1.5 V undervoltage would be
unlikely. If the tester is like $10 to $15 I can understand that, any
more and it should do precise testing, given that a $9 DMM can do the same.
michael
Christopher Pollard said:It's here new for $9.99.You could do a lot worse than this example:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=25412&item=3830665168
Chris Pollard
http://www.baylornet.com/research/Simpson.260.Series.Multimeter/item29/25412.html
AG
One is a 430TX mobo made by some defunct company and doesn't seem to
have any documentation available for it on the web. The other is an
FIC PA-2007 (VIA VP2 chipset) that uses a 5V-only Analog Devices brand
chip to convert between RS-232 and TTL levels and contains its own
charge pump circuitry to generate +10V and -10V for the RS-232 side.
When I bought this mobo used, its RS-232 ports didn't work except at
slow speeds because two .1 uF surface mount capacitors for the charge
pump were missing. I thought they'd been knocked off during
installation of a PCI card, but apparently they had vaporized when the
previous owner plugged or unplugged a parallel printer or serial
device with the power on. I know that the parallel port could do this
because my friend later unplugged a printer from this mobo and caused
the same capacitors to explode.
In any case, your original statement that the motherboard doesn't
"use" these negative rails can be seen to be ambiguous. A PCI-only
board would not need the -5V rail since the PCI spec makes no
provision for same. However, the -12V supply *is* bussed to the PCI
slots, so the motherboard does actually use it.
Micah Torrance said:I keep both in my toolbox. I find the tester is most times right, and
is good for a quick-and-dirty check of things. If I have to get into
it more deeply, I haul out the dmm and crank it up.
I got the PS tester at CompUSA and it's come in very handy.
I got mine at CompUSA as well .... Is it a CompUSA brand?
On Wed, 04 Aug 2004 06:35:45 +1000, Franc Zabkar
The motherboard may route -12V to PCI but what uses it?
Old soundcards with integral amp come to mind but nothing else.
Micah said:Don't have it in front of me right now, but I believe it is.
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