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Type: Posts; User: AG6GU

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    Careless mistake on my part. Thanks. I know you...

    Careless mistake on my part. Thanks. I know you can light an LED on 1 volt or two without limiting the current so should have realized that.
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    Ok. I was assuming the 3.6 is driving the LED but...

    Ok. I was assuming the 3.6 is driving the LED but appears it's actually the SGTL5000 driving the LED on the 3.6. I get 5.7ma for the LED assuming VDDIO 3.3V minus .6v drop through the LED and 570 ohm...
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    Thanks for the reply. Makes sense that the 3.6...

    Thanks for the reply.
    Makes sense that the 3.6 would be driving I2S RX on the Audio shield. My confusion is that when I look up pin 25 for the SGTL5000 using the data sheet link on this site, I see...
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    Audio shield pin 13 PC board jumper trace.

    I see that there's a copper jumper on the Audio Shield board on connector pin 13 and it looks like it ultimately connects to pin 25 of the SGTL5000 signal I2S_DOUT. The 3.6 schematic shows pin 13...
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    Audio shield pin 13 PC board jumper trace.

    Been trying to debug this using the audio tutorial Part_1_02_Hardware_Test and I'm finding I can get audio output from the headphones pretty consistently for several seconds every time if I cycle the...
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    Well I too am on my second board that has...

    Well I too am on my second board that has headphone output issues. I'm pretty sure I connected HPVGND to system GND through my amplifier on the first board, but have been more careful with the second...
  7. Fair enough and thanks for the reply. I figured I...

    Fair enough and thanks for the reply. I figured I had already admitted to doing something careless and stupid in my original posting so I was a little more sensitive to the wording of your reply than...
  8. Well thanks for the reply and the insult. I did...

    Well thanks for the reply and the insult. I did read the note but it had not occurred to me that I was making that GND connection when I plugged in the AMP.
    I look forward to not posting again 8)
  9. Looks like maybe the line-out on shield board may...

    Looks like maybe the line-out on shield board may still work since it seems to just reference system GND. Won't be able to try that until tomorrow. Sorry about not 'posting full source code' but I...
  10. Grr! 8) Found this in the data sheet. "Do not...

    Grr! 8)
    Found this in the data sheet.
    "Do not connect HP_VGND to system ground, even when unused. This is a virtual ground (DC voltage) that should never connect to an actual “0 Volt ground”. Use...
  11. Audio shield headphone out connected to consumer stereo amplifier line-in

    Hi;
    I was working through some of the Tutorial material for the Audio shield and Teensy 3.2 over the weekend. Things were going great but I found that the next morning I was not able to get ANY...
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