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thank you defragster! This is super helpful. This was my suspicion, but I was not 100% sure! I will try with additional AAA batteries. I currently do not have a holder for more than one battery, but will report back when I can test!

I'm trying to use a step up converter to power my Teensy, but I'm not getting anything. It seems like it's not booting properly. I'm using the PT8211 audio out kit for sound output as well. I'm currently using one of these for testing...

Thank you so much for this info! Here's my schematic for reference, we'll see how things work :)

Hi folks, pretty new to working with line level vs headphone levels. I'm wondering what I'd need to do to get a good volume controllable headphone signal out of the line out signal from the PT8211. Could I use something like the MAX9722A after the line out signal to get a reasonable headphone...

Hi everyone, I spent some time making a REVD audio adapter footprint and symbol for kicad. I'm still pending boards made with them, but I have done a printer test and everything seems good. Let me know if you see anything that seems off and I'll make changes and re-upload here :) Please feel...

wait, so if they don't share a ground. Say, in the instance of an aux in to an external speaker it's OK to use the headphone port of the SGTL5000 for that connection...? this will be ok? I'm confused now. This would sort of contradict what skybrian said above: unless you're saying explicitly...

*thanks for this helpful reply*, It's not like i wrote the aux port of the speaker or anything... :rolleyes:

the line vs HP was my understanding as well. I'm just hoping not to end up with something that will not break in the long term ;) Good to know, this could be a workable option then! The wm8731 looks interesting, does that mean with the wm8731 chip the headphones are not using a VGND? I see...

I tried this, and it works with a LM4808, but its pretty quiet compared to the audio shield. I might have the impedance off or something?

Hi everyone, thanks you for taking a look at this. I've been trying to work out an ideal output stage for my project since my last post about using the A14 DAC on the 3.2 and I've shifted directions a bit after running into loads of issues there with the analog circuits from that approach...

I'm working on making something similar to this, mounting the teensy and audio adapter side by side: https://www.pjrc.com/breakout-board-for-teensy-4-0/ But I also want to break out the pins for the head phone jack so I can mount a different head phone jack in another location in my project on...

Appreciate that! I'll look into the MAX98357. Are you recommending that for the speakers only or the headphones as well ? Generally do you encourage going with some sort of i2s / i2c output instead of directly from the DAC? I suppose it's ultimately about equally as difficult / amount of...

I also found this thread: https://forum.pjrc.com/threads/32597-Chossing-the-right-opamp-for-teensy-3-2-DAC-audio-output?highlight=3.2+DAC+headphones which maybe answers this question in that my approach with the CMOY / opamp direction is OK?

Absolutely appreciate the gesture to use the shield, and I may do that if I cant figure this out – it's a really great backup! But, in the interest of learning something new vs using another module, I'm hoping to learn more about these kind of output, amplification, and audio circuit issues. I...

Hello everyone, thank you very much for reading and looking at this post! I'm working on a new project and outputting to my teensy 3.2's DAC, which is working great! The project is mostly outputting filtered noise, so It's not really critical that the quality is super good or that the signal...