From: Craig H. <cr...@gu...> - 2005-05-20 16:57:22
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> Craig Hughes wrote: > > >> Gordon, >> >> was I right about there being a way to patch an old audiostix into >> a new one? I kind of pulled that one out of my ass >> >> C >> >> > this is re: mic-in? yes, there was, it was how we corrected it in > testing. > it was to add a power-the-mic-line-through-one-resistor i think. > > I believe this is how: > Make sure there's a 4.7uF CAP connecting the Jack to the UCB1400 > already. > Then Add the following resistor with R=2K8 > AVdd {can be pulled off a bypass cap easily enough} ____-/\/\/\/ > \/\-____MIC-IN {can be pulled off the Jack} > > To reiterate: > (A) If C3 is not populated, add a 4.7uF cap there. > (B) Connect "LINE_IN_LA" to the resistor mentioned above by > soldering one end to the MIC Jack and the other to a wire connected > to AVdd > > Questions: > 1. Which is the correct pad of the Jack? It is the pad on the edge > that has only one pad. > 2. Which bypass cap? The bypass cap (0.1uF cap) nearest the > aforementioned pad. NOT the huge caps-- the tiny cap. Confirm > with a multimeter/continuity tester that it is [A]Vdd and not GND. > > > Gordon On May 19, 2005, at 8:30 PM, Craig Hughes wrote: > OK, I'll go digging for the details. > > C > > On May 19, 2005, at 12:55 PM, Andreas Granig wrote: > > >> Craig Hughes wrote: >> >> >>> The "query" on l doesn't work (and I haven't had a chance to work >>> on fixing that yet), but setting it should work. Try aumix -l R >>> -l 100 then try a line-in source. I doubt it's a software >>> problem, since you're able to play, and recording "works" but is >>> just giving you silence. >>> >>> >> >> Yes, this one did it: >> >> # aumix -i 100 >> # aumix -l R -l 100 >> aumix: MIXER_WRITE >> # brec -S -s 8000 -b 16 -w foo.wav >> >> But since I always tried it with a mic source, I didn't hear >> something. Only audacity showed that it had recorded something, >> and after a boost of 30dB I was able to hear it. >> >> >> >>> iirc there is a soldering iron patch you can make to enable the >>> old cards to do mic- in too, which I'll look up if you can >>> confirm that line-in is in fact working. >>> >>> >> >> The soldering iron is already heated ;o) >> >> Thanks, >> Andy >> >> >> ------------------------------------------------------- >> This SF.Net email is sponsored by Oracle Space Sweepstakes >> Want to be the first software developer in space? >> Enter now for the Oracle Space Sweepstakes! >> http://ads.osdn.com/?ad_id=7412&alloc_id=16344&op=click >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> > > > > ------------------------------------------------------- > This SF.Net email is sponsored by Oracle Space Sweepstakes > Want to be the first software developer in space? > Enter now for the Oracle Space Sweepstakes! > http://ads.osdn.com/?ad_id=7412&alloc_id=16344&op=click > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |