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I have a little speaker with a pam8403 amplifier. I also have a teensy which is outputting audio through the audio shield. When the teensy and the speaker are powered by different batteries, it works fine - the speaker plays the audio as expected. However, when they're both connected to the same...

Thanks for your help - unfortunately line out is still distorted. Less distorted than the audio jack, but it sounds like a loud square wave rather than a sine wave. At this point, do I just have a faulty audio adapter?

Hey Paul - I think that waveform is correct, a sine wave with an envelope with 0.25 sustain, have I misunderstood something?

Thanks Mark - I tried it with headphones and it's still distorted, but it's much quieter. If I'm going to use a mini speaker in this project, how should I wire it up? Normally what I do is take it apart and solder the input wires directly onto the audio adapter where the headphone jack is

Here is a video showing what I mean. This is just a test sketch playing a waveform through an envelope ever 500ms, but I've run some of the example sketches too, and all the audio is coming out distorted. It's a fully charged li-po, and a mini speaker - which I've tested on my laptop and it...