如何发送固定电压的Android音频插孔

Question

I have a small device that operates using the smartphones audio jack. I would like to send a fixed amount of voltage in the audio jack in order for the device to operate. I am using the AudioTrack in the MODE_STREAM. I also have a buffer in which I write a sine signal of fixed frequency as found in here .

It sends single tones to the audio jack. Does it mean that the output voltage is fixed or it varies according to the sine signal? Is there a way to ensure that the output voltage of the audio jack is at a fixed value?

Thanks!

Answer 1

To answer my question it seems that the AC output voltage is controlled by the sound volume level and it seems to be device dependent. Thanks for the comment!