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 working excellently and I'm pleased with the results. However, even with a single track playing, I notice a (rather quiet) high pitch buzzing. This buzzing is only present whilst actually playing a track and stops immediately once the track has finished (or been stopped). I've attempted to use a DC block cap of 10uF in series with the DAC output, but this doesn't appear to solve the issue. The output of the cap is fed into an active amplifier.
I've added an additional 10uF cap to stabilise the 3.3v line, again to no effect.
I don't believe it is the samples themselves; I've tried samples made up by myself as-well as the recommended samples linked from JPRC's site. (None of which have this buzzing when played from a PC).
Is this normal? Or what can be done to clean that up?
Thanks in advance.
Recently been working with the Audio library (which is excellent). I set up a configuration as follows:
AudioPlaySdWav => AudioMixer => AudioOutputAnalog (DAC)
AudioPlaySdWav
This is working excellently and I'm pleased with the results. However, even with a single track playing, I notice a (rather quiet) high pitch buzzing. This buzzing is only present whilst actually playing a track and stops immediately once the track has finished (or been stopped). I've attempted to use a DC block cap of 10uF in series with the DAC output, but this doesn't appear to solve the issue. The output of the cap is fed into an active amplifier.
I've added an additional 10uF cap to stabilise the 3.3v line, again to no effect.
I don't believe it is the samples themselves; I've tried samples made up by myself as-well as the recommended samples linked from JPRC's site. (None of which have this buzzing when played from a PC).
Is this normal? Or what can be done to clean that up?
Thanks in advance.
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