On Saturday 07 October 2006 05:17 pm, lcdpublishing wrote:
Hmmm, that sounds neat. I will have to look through my box of
computer "Guts" and see if I have an old card. Chances are good
though they would be surface mount though wouldn't they?
Not the caps, though.
I had one die on me here a while back, and there really wasn't all that much
to it -- the chip itself and maybe a couple of buffers and such, and the
rest of what was on that card was caps and some connectors for things like cd
audio and such. It shouldn't be too hard to see which caps you need to mess
with, just look from the line in connector (that is the one you're using
right?) and trace it out. You probably don't even need to remove them, just
check first to see if there's any DC present on the side away from the jack,
and if not, solder a bit of wire across them and you should be good to go.
Of course this puts the input jack connecting directly to the chip, but I
expect your use probably has some external circuitry anyhow, doesn't it?
The little bit of stuff I recall looking at for pc scopes did. And in fact
it may have been on one of those pages where I saw this idea in the first
place, I don't recall.
--- In Electronics_101@..., "Roy J. Tellason"
<rtellason@...> wrote:
On Saturday 07 October 2006 03:54 pm, lcdpublishing wrote:
The one problem with this type of scope is accurately calibrating
the voltage (vertical) scale. These things (SOundcard versions)
cannot measure a steady DC voltage - it must be alternating to
different levels and at some magical, Minimum frequency.
There's a way to get around that, particularly if you have a
spare sound card
to mess with. You remove the coupling capacitors that are
blocking the DC
from the input connector, and jumper the pads...
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Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
