TonyAme

Thanks very much for the great help on this, very much appreciated. TonyAm

Yes, AGND and GND can be connected. VGND (ground terminal of the headphone jack) and either GND or AGND must not be connected. When you install both T4.0+AudioBoard on your board, does the Teensy work fine for some time until the voltage...

Is it ok to connect AGND to GND the way I did in the schematic? Thanks.

Ok, when using the Teensy with an Audio Board like that, it has happened that parts from the underside of the Teensy touch parts of the Audio Board and SHORT OUT. That's one of the reasons why it's better to use tall plug and sockets for the...

Thank you. I did use the tall headers on the first board that I put together and has the same problem. I will investigate this possibility. Edit: Ok, when carefully inspecting the two boards nothing is contacting in a short, all separated...

Right, thank you. Here it is on top of the Audio Board Rev D from Amazon.

A photo showing the Teensy would be useful.

Hello, Thank you for reading. I bought a Teensy 4.0 and Audio Board Rev. D from Amazon and been having problems with my custom PCB audio circuit, whereas previously I did not. I noticed that on the Teensy 4.0 purchased from Amazon it had "NXP"...