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soundcard max (safe) input voltage
soundcard max (safe) input voltage
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Old 1st April 2013, 06:29 AM   #11
geraldfryjr is offline geraldfryjr  United States
diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
Well, It is hard to say what could have caused the chip to go out, as sometimes they just do.
Many times it is common house hold static charges, I lost my pinnacle video digitizer card because of this.
I pulled the card as it was working and when I reinstalled it later it doesn't work at all now, not ever since then.

I had a scare just the other day where the ALC892 in my machine was being flakey and as I was messing with my loop back buffer I accidently touched a 12V line to the input to it and found I thought I lost an input.
As it turned out I had an intermittent cable and it was bad and I didn't know about.
swapped it out and every thing was fine.

Then I did another loopback test and it was fine, But my Flakey ALC892's outputs keep glitching and I can see this on the scope.
Sometimes it works perfectly and sometimes it is just Flakey.

Posted is two tests that were back to back and the glitches are very random.
I am not yet sure yet if this Win7 driver issue or if the chip is just plain Flakey.

But the voltages I mentioned I have done on my older 933Mhz P3 Dell with an AD1885 as well, and, it doesn't seem to phase it either as it's maximum input is rated at 1Vrms (2.83Vp-p).
My signal generator is good for about 20Vp-p.

Sometimes those cheesy input jacks can go bad as well I have had issues with them on my old P4 Asrock board before.
And on my Xfi card when it is in the last slot and there is not enough room to put the 1/8 mini to rca adapter.

Haveyou tried a different input source or a straight thru loop back test?
I have ruined a few of those really thin Microphone cables before as they can't take alot of abuse from being pulled on.

I have recently measured voltages as high as 4.5KV using a proper resistor divider network with the sound card inputs here,



It is possible that maybe one of the input capacitors got open as their voltage ratings are not very high, it is hard to say without knowing more details about your setup.

Attached Images
File Type: jpg ALC892 TEST 1.jpg (457.2 KB, 78 views)
File Type: jpg ALC892 TEST 2.jpg (452.4 KB, 69 views)

Last edited by geraldfryjr; 1st April 2013 at 06:38 AM.
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