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Can applying 3V damage a sound card?

Last response: in Components
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May 25, 2012 3:36:28 PM

Hi all,

I have a sony vaio laptop, and I installed a PC based oscilloscope program. For testing, I applied a 3V signal to the mic input. A crackling sound is heard from the speakers. After that It feels like audio input sensitivity is decreased. Can 3V damage the audio card?. How can I check is there damage of sound card? A help from anyone is highly appreciated.
My sound card is realtek HD
May 25, 2012 3:47:00 PM

3V in the mic input does sound like a lot. A microphone only outputs very slight voltage variations, that's why you always need an amp.
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May 25, 2012 3:52:31 PM

FinneousPJ said:
3V in the mic input does sound like a lot. A microphone only outputs very slight voltage variations, that's why you always need an amp.


Thanks for ur reply. I know 3V is not the usual voltage range of a audio input. But I thought there will be some over voltage protection circuit inside the card. What I want to know it, is it possible to partially damage a sound card( In my case reduced sensitivity)?
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May 26, 2012 4:46:54 AM

likhin said:
What I want to know it, is it possible to partially damage a sound card( In my case reduced sensitivity)?
Yes absolutely, While the inner components that make up electronic hardware usually either work or don't work It's not unheard of for a stressed inner component (transistors, resistors, capacitors etc.) to have their value changed as a direct result of stress (IE improper voltage, heat, improper grounding, etc.) This changed value can cause issues which might manifest in a myriad of ways including reduced sensitivity.

In your case reduced sensitivity seems to be logical since the area you fed the over-voltage too leads directly to the circuitry responsible for that sensitivity.

I'm sure you suspect this already anyway. I wish I could give you a different answer.
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