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Old 18th October 2013, 02:37 PM   #331
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Originally Posted by RollE2k View Post
what is the output voltage to the "lock" led? and which is the current-set resistor for the led? - thinking about using a blue led there which does have ~3.2v forward voltage.
Blue LEDs usually require a lot more current, and could damage the ES9018, unless you add a buffer (R+Q). Off the top of my head, it is 3.3V. The resistor is easy to find, just follow the trace back toward the chip (at work, so I cannot look).
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Old 18th October 2013, 02:40 PM   #332
RollE2k is offline RollE2k  Sweden
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Approx what current does run through the leds right now?
I won't need more than maybe 4mA max, so that wouldn't be impossible i think? :-)
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Old 19th October 2013, 05:29 PM   #333
RollE2k is offline RollE2k  Sweden
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Could you check this Brian? 3-4mA ok? :-)
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Old 19th October 2013, 09:26 PM   #334
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Unhappy S/PDIF & Ground shorted out

I have not had my board hooked up yet. While waiting for other parts, decided to solder on the uFL sockets onto the board—I did the s/pdif first, since until I have a USB interface, I'll be using toslink. After I soldered it, I tested continuity, and the ground and s/pdif were shorted. So I unsoldered the connector, thinking that I must have gotten a solder bridge under it. No—all was clean. It is still shorting though, which I can't imagine is correct. The pads are clean, there is no visible solder to connect them. Is it possible that solder got into the mid layers? Any way to fix this? If not, will this affect the PCM/DSD input? I used very little solder—.015 diam. with a rtiny tip (.020?) on my Hakko. Heat was at 640 F.
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Old 20th October 2013, 12:38 AM   #335
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Originally Posted by RollE2k View Post
Could you check this Brian? 3-4mA ok? :-)
R2 and R5 feed the LEDs. They are both 357R, yielding roughly 9mA to the LEDs.
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Old 20th October 2013, 12:39 AM   #336
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Originally Posted by picovolt View Post
I have not had my board hooked up yet. While waiting for other parts, decided to solder on the uFL sockets onto the board—I did the s/pdif first, since until I have a USB interface, I'll be using toslink. After I soldered it, I tested continuity, and the ground and s/pdif were shorted. So I unsoldered the connector, thinking that I must have gotten a solder bridge under it. No—all was clean. It is still shorting though, which I can't imagine is correct. The pads are clean, there is no visible solder to connect them. Is it possible that solder got into the mid layers? Any way to fix this? If not, will this affect the PCM/DSD input? I used very little solder—.015 diam. with a rtiny tip (.020?) on my Hakko. Heat was at 640 F.
Can you post a picture of the pads?
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Old 20th October 2013, 02:54 AM   #337
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Default pads close up

Here's a macro shot with low angled lighting. I'm including a quick shot of the housing I've made while waiting the 5 months for the final parts (MJE for BP supply, Mouser is shipping this week!!)
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Old 25th October 2013, 10:25 AM   #338
DQ828 is offline DQ828  Australia
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Originally Posted by picovolt View Post
Here's a macro shot with low angled lighting. I'm including a quick shot of the housing I've made while waiting the 5 months for the final parts (MJE for BP supply, Mouser is shipping this week!!)
I like the case very much, not sure about the soldering though

I shouldn't talk I fried a track to the lock light & had to do a micro repair, you might be able to do a similar thing, if you can work out where the grounding is occurring.

Last edited by DQ828; 25th October 2013 at 10:29 AM.
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Old 25th October 2013, 02:23 PM   #339
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I'm hoping to. The soldering didn't look bad, until I had to solderwick off the connector and then, when it was still shorted, kept using more solderwick in the area to soak up as much as I could. But obviously I did screw something up with the soldering. For work I've been building small boards with many 0603 LEDs on them, and felt pretty confident about putting the uFL connectors on. I've looked at the immediate area with a 20x scope (boy is it nasty looking at that scale!) and from the board exterior don't see any bridging. There are those tiny holes around the ground pads, and my worry is that somehow solder went through those and might be shorting traces in the mid layer. If that's the case, then the only fix I can imagine would be grinding away the uFL area pad connectors there to get inside—but certainly want to wait until I get Brian's answer about whether the short could be happening in a mid layer (1) and if I grind away just that area (say the rectangle defined by the outer edges of the two uFL ground pads) are there other traces in the mid layers that I'd be totally mucking with (2).

Thanks about the case—the front is wood from your neck of the woods—Australian Lacewood.
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Old 25th October 2013, 03:04 PM   #340
4est is offline 4est  United States
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Nice case, I like the lace wood!
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