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Thanks for the reply. That's a helpful post as well! Nice project BTW!!!

Lightbulb moment. The real issue it seems has been, the amplifier I was trying to use which is really not very high quality, and my inappropriate expectations of performance of that implementation. I tried an experiment. I have a SONY SRS-X3 BlueTooth Speaker laying around (FWIW - I really...

Very interesting. So you are saying you used this amp fed with the line-out of a Teensy Adapter board; the 12V brick powered the amp, and from the amp, you jumpered over to some 5V regulator to power the Teensy? Can you provide me with the specifics of the power-brick used, and also the 12V to...

In a small metal enclosure, I wish to place a DSP noise reduction and morse code decoding circuit built around the Teensy 4.1 and accompanying Audio Adapter; see https://github.com/grahamwhaley/DSPham/blob/master/README.md to be used with SW receivers or HF transceivers that lack that...

MarkT - thank you for the time and effort spent in your reply. Very helpful and appreciated. How then would you recommend to someone like myself that they go about getting the processed audio signal off the Audio Adapter board and into a reasonably priced amplifier and speaker? Audio from the...

Mark, thanks. I was also considering the use of a linear optocoupler like the following: https://www.vishay.com/docs/83622/il300.pdf That should have significantly higher bandwidth than a 1:1 isolation transformer. As an Amateur Radio Licensee, you might find these transformers in an audio...

@ Well, I definitely appreciate the response. On the 4.1 board, is that connection between VUSB and VIN (at those pads) common to one another, unless I mechanically cut it? So, then I need to cut that connection between the pads if I want to power my project from some other source than the USB...

I'm dealing with a similar problem. I've got a pretty decent signal coming off a 4.1teensy compatible audio board (I think rev D), and going into a pair of SONY headphones and being subjectively judged by my simple brain. But it's not ideal for me to be listening to the audio output from the...