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've since moved on to a few options and I've got a few questions about them individually and generally. I feel like maybe one of the issues that I'm having is that I'm basically trying to run noise out of the teensy and audio tool. Making a sort of complex white noise machine and I feel like that noise is making things behave less consistently, but I'm also just not confident.
1. PJRC audio adaptor / shield
This is working great, the STGL5000, is working well. But my understanding is that because of the way that chip works, I'll need to have 2 jacks, one for headphones and one for line out due to the VGND on the headphones. Ideally I'd like to just have one jack out that can drive headphones and can double as a line out someone could use on a set of powered computer speakers if desired. Is that impossible or improbable to accomplish? I could use the line out and go to an external headphone amp circuit which I think will be the next thing I try to get around the VGND issue.
2. CS4344
I purchased a cheap CS4344 widget and got it working but it's really quiet and has a lot of distortion in my application (filtered noise), I'm not sure what's going on here, but I think it might have something to do with the filter. I was attracted to this chip for it's low part count and easy solderability. I don't think this will be an option unless I've done something wrong here...
On a teensy 3.2 I connected as follows
MCLK >11
LRCLK > 23
SCLK > 9
SDIN > 22
3. PCM5102
I purchased a cheap PCM5102 widget and got it working and it's great, I'd say equal to the audio shield, if not somewhat louder. My main questions with this is that I put headphones in the jack just to see and it seemed to work out fine with some Koss portapros (60 ohms). But something tells me from what I've read about everything else that this is maybe a bad idea / the wrong thing to do?
On a teensy 3.2 I connected as follows
SCK > 11
LCK > 23
BCK > 9
DIN > 22
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've since moved on to a few options and I've got a few questions about them individually and generally. I feel like maybe one of the issues that I'm having is that I'm basically trying to run noise out of the teensy and audio tool. Making a sort of complex white noise machine and I feel like that noise is making things behave less consistently, but I'm also just not confident.
1. PJRC audio adaptor / shield
This is working great, the STGL5000, is working well. But my understanding is that because of the way that chip works, I'll need to have 2 jacks, one for headphones and one for line out due to the VGND on the headphones. Ideally I'd like to just have one jack out that can drive headphones and can double as a line out someone could use on a set of powered computer speakers if desired. Is that impossible or improbable to accomplish? I could use the line out and go to an external headphone amp circuit which I think will be the next thing I try to get around the VGND issue.
2. CS4344
I purchased a cheap CS4344 widget and got it working but it's really quiet and has a lot of distortion in my application (filtered noise), I'm not sure what's going on here, but I think it might have something to do with the filter. I was attracted to this chip for it's low part count and easy solderability. I don't think this will be an option unless I've done something wrong here...
On a teensy 3.2 I connected as follows
MCLK >11
LRCLK > 23
SCLK > 9
SDIN > 22
3. PCM5102
I purchased a cheap PCM5102 widget and got it working and it's great, I'd say equal to the audio shield, if not somewhat louder. My main questions with this is that I put headphones in the jack just to see and it seemed to work out fine with some Koss portapros (60 ohms). But something tells me from what I've read about everything else that this is maybe a bad idea / the wrong thing to do?
On a teensy 3.2 I connected as follows
SCK > 11
LCK > 23
BCK > 9
DIN > 22