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Old 21st May 2004, 02:46 PM   #1
Rixsta is offline Rixsta  United Kingdom
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Default how can i protect my soundcard's input

Anyone know how to protect a soundcard input/output from a power spike while still getting good quality sound ?
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Old 21st May 2004, 03:32 PM   #2
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The usual method is a pair of back-to-back diodes.
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Old 21st May 2004, 03:44 PM   #3
Rixsta is offline Rixsta  United Kingdom
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Cool nice and eazy cheers do i do that on the ground and the singnal wire or just the signal ?

dont worry you need the ground dont you stupid me lol

dont diodes produce loads of distortion or is it ok because the diodes are back to back.

Also lol are they zeners ?
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Old 21st May 2004, 04:03 PM   #4
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They will distort as you approach the limit voltage. Lower level signals won't be affected much. The cut-ff is not abrupt and the effect probably won't sound offensive unless a high input is really sustained.

One thing you need to find out is: what is the maximum peak (not RMS) voltage allowed for your soundcard. The zener voltage needs to be a bit lower than that. For example, if the highest peak allowed was 6V, I would use two 4.3V zeners which results in a limit of approximately 5V so that you have a saftey margin.

If someone has a more precise rule or calculation, hopefully they will post it.
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Old 21st May 2004, 04:14 PM   #5
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally posted by sam9

If someone has a more precise rule or calculation, hopefully they will post it.
he he yep

exelent stuff you diy people rule
i take it that they protect against dc too

as iv'e said before on this site "im a bigginer to electronics" but hey im learning.

Thanks

rixsta
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Old 21st May 2004, 04:50 PM   #6
tiroth is offline tiroth  United States
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I recommend some resistance in series prior to the diodes unless all of your sources are short-circuit protected. You don't want to protect the sound card by blowing out the source component when the voltage gets high enough for the diodes to conduct (or risk frying the diodes).

I used series-connected LEDs instead of zeners, supposedly much quieter.

As long as the series resistance is a reasonable fraction of the input impedance, you should be fine.
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Old 21st May 2004, 04:57 PM   #7
sam9 is offline sam9  United States
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"I used series-connected LEDs instead of zeners, supposedly much quieter."

Is there enough cuurent to light the LEDs when overcurrent conditions occur. If so, that's clever - I'm a sucker for flashing lights.
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Old 21st May 2004, 05:26 PM   #8
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ok cheers people for now i will try the Led's
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Old 21st May 2004, 05:28 PM   #9
tiroth is offline tiroth  United States
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Quote:
Originally posted by sam9
Is there enough cuurent to light the LEDs when overcurrent conditions occur. If so, that's clever - I'm a sucker for flashing lights.
Yep. Just watch out, LEDs are not as robust as zeners--current limiting is mandatory.
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