Is there any way to stop the phone charging the DAC/AMP?
The typeC interface to micro cables, the typeC plug looks the same, but there are actually two forms.
The pull-up resistor in the form of plugs for charging. That is the kind of mobile phone standard in the giftbox.
And the decoder OTG equipment need to use the pull-down resistor plug, which can prevent reverse charging. Micro plug the ID pin need to short with G pin.
You may DIY the certain cable according this answer from our engineer for reference.
Best regards
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