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» Film-Tech Forum   » Operations   » Film Handlers' Forum   » A-Chain readings using laptop mic input

   
Author Topic: A-Chain readings using laptop mic input
Frank Dubrois
Jedi Master Film Handler

Posts: 896
From: Cleveland, OH
Registered: Mar 2005


 - posted 06-24-2006 02:16 PM      Profile for Frank Dubrois     Send New Private Message       Edit/Delete Post 
I know its definately the way to do it. But my external sound card wont be here until next week, so I made a set of cables to try this out and maybe compare the readings (just because I get bored). The dolby tone didnt even register. Would that be common? I thought I'd at least get a reading, but it was flatline. I thought the mic input would at least work..just not be as accurate.

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Monte L Fullmer
Film God

Posts: 8353
From: Nampa, Idaho, USA
Registered: Nov 2004


 - posted 06-24-2006 04:01 PM      Profile for Monte L Fullmer   Email Monte L Fullmer   Send New Private Message       Edit/Delete Post 
Where are you trying to get the source from? Mic input doesn't like higher current sources like what an AUX output creates...doing such a feat requires a 40 to 50 dB current attenuation before heading into the mic input..

..you possibly could have toasted the mic circuit on your laptop doing this..

-Monte

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Frank Dubrois
Jedi Master Film Handler

Posts: 896
From: Cleveland, OH
Registered: Mar 2005


 - posted 06-24-2006 04:11 PM      Profile for Frank Dubrois     Send New Private Message       Edit/Delete Post 
lol...oh good. I dont use the mic for anything anyway.

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Frank Dubrois
Jedi Master Film Handler

Posts: 896
From: Cleveland, OH
Registered: Mar 2005


 - posted 06-27-2006 04:25 PM      Profile for Frank Dubrois     Send New Private Message       Edit/Delete Post 
FYI...it does damage the either the sound card or the speakers. i hear a cracling noise whenever the speakers are used or the volume is adjusted. Oh well...

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Charles Greenlee
Jedi Master Film Handler

Posts: 801
From: Savannah, Ga, U.S.
Registered: Jun 2006


 - posted 06-27-2006 11:04 PM      Profile for Charles Greenlee   Author's Homepage   Email Charles Greenlee   Send New Private Message       Edit/Delete Post 
Had it have been a desktop or tower, I'd say scew it and just replace the soundcard. But a laptop? I'd be Po'ed.

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Frank Dubrois
Jedi Master Film Handler

Posts: 896
From: Cleveland, OH
Registered: Mar 2005


 - posted 06-27-2006 11:43 PM      Profile for Frank Dubrois     Send New Private Message       Edit/Delete Post 
Well, I wanted to try it. Its a little annoying that it happened, but not totally unexpected. I dont really use sound with the laptop anyway, so its not a big deal.

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Charles Greenlee
Jedi Master Film Handler

Posts: 801
From: Savannah, Ga, U.S.
Registered: Jun 2006


 - posted 06-29-2006 12:43 AM      Profile for Charles Greenlee   Author's Homepage   Email Charles Greenlee   Send New Private Message       Edit/Delete Post 
You live, you learn. How many of today's great discoveries blew up on their inventors when they were just experiments in someone's garage? You may have a very valid idea, just forgot to check the signal strength. Next time you try it, build an attenuating circuit to drop the signal down to tolerances. Good thinking though.

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