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I'm glad I wasn't just going insane. The fact I hadn't found this reported anywhere else had convinced me that it was an application hardware issue.

Following this closely but don't have the...

Horizontal scaling is in the top left. 3.3v supply is rock solid.

I haven't personally tested with RAW, only WAV.

No, it wasn't. It's quiet enough that it's not a real issue for my application, although it would be nice to solve it. The issue was still present on the PCBs I designed and had made up, leading me...

Correction; it was with 1.21 test 2 that this is an issue.

I've used 2 different SD cards, one is a generic class 10 card from china; the other a class 4 samsung card. Both produce the same issue....

Thanks for the reply.
This was with 1.21 test 1 I believe. (It was whichever was the one that was initially available when the 1.21 forum thread went up). I hadn't realised there was a test 2...

Hi again,

I've put together an audio amplifier circuit using the LM386, with just a gain of 20. This drives an 8 ohm speaker.
The entire thing is powered by a single 12v supply, with a LD33CV...

Okay, thanks very much. It's not really an issue for me (given the environment that the application is designed for, no-one is realistically going to notice it), but I figured before I start looking...

Thanks for the replies again.

So what you're saying, is that it's the teensy being grounded to the amp which is causing the issue? Why is it that this causes an issue? And why is it only apparent...

Thanks for the replies,
The DAC output is connected to the anode of the electrolytic cap. The cathode is then connected to an input to a 100W stereo Karaoke amplifier (powered from mains), driving...

Hi,

Recently been working with the Audio library (which is excellent). I set up a configuration as follows:

AudioPlaySdWav => AudioMixer => AudioOutputAnalog (DAC)
AudioPlaySdWav

This is...