Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: FredT

Search: Search took 0.00 seconds.

  1. Yep you did bring that up. At the time I was not...

    Yep you did bring that up. At the time I was not seeing it...

    Although this is working fine on the official audio shield and now my board, there are still significant voltage spikes when...
  2. I believe I figured out the problem. Hopefully...

    I believe I figured out the problem. Hopefully it will help others that may have "forgotten" to use basic PCB layout rules...

    First of all, I realized that I blindly use the schematic of the...
  3. Well it reduce the occurrence but can still...

    Well it reduce the occurrence but can still happen.
  4. Looks like adding 100 Ohm resistor in series on...

    Looks like adding 100 Ohm resistor in series on the line in prevent the problem. So far I have not observed side effect on the audio signal. The SGTL5000 has input impedance of 29k so the impact...
  5. I just started back to look at this issue. I'm...

    I just started back to look at this issue. I'm using a custom audioboard with SGTL5000 but still using a retail teensy 3.2. The audio circuit is following closely the audio board reference...
  6. Yes. 2uf Same as in the reference SGTL5000...

    Yes. 2uf Same as in the reference SGTL5000 schematic.
  7. Update, I'm now able to repro the problem. This...

    Update, I'm now able to repro the problem. This is clearly a transient when connecting to another device. I can repro by wiggling the 3.5mm mini jack audio connector when connecting to a device(like...
  8. Line in protection SGTL5000 ESD / EMI causing SGTL5000 to stop

    Hi, I'm looking for wisdom/advice. I'm using the the SGTL5000 with teensy 3.2. I'm only using Line In input on the SGTL5000 and just passing the data via serial USB. The teensy is then connected to...
  9. Teensy Loader Linux soft reboot not working for brand new teensy. (Works on windows)

    On a brand new teensy, you can program it with teensyduino on windows without pressing the button on the teensy.
    However, teensyloader CLI tool on linux always force you to press the button on brand...
  10. Replies
    141
    Views
    53,655

    @Blackaddr is the latest schematic rev available?

    @Blackaddr is the latest schematic rev available?
  11. Indeed, I knew I was more than borderline with...

    Indeed, I knew I was more than borderline with the impedance. It was working ok until I added the audio board. I added an opamp buffer (LM324) before the ADC input and things looks very good now.
    ...
  12. When stacking them for troubleshooting, I cut the...

    When stacking them for troubleshooting, I cut the pin A1 from reaching the audio board entirely.

    I also saw that even without the audio board connected, A1 was slightly more noisy than analog...
  13. Noise on ADC A1 input with audio board connected (Teensy 3.2)

    Hi, looking for wisdom on this issue. When I use the audio board with teensy 3.2 analog input A1 has twice the amount of noise. I though it was somehow the noise from the clocks generated by the...
Results 1 to 13 of 13