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The audio output is fed through an amplifier and sent directly to the audio output jack. It can drive a 32Ω load with a 2V RMS signal.
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The on-board switch is connected to the GPIO02. The GPIO02 GPIO12, which is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO02 GPIO12 to be pulled high.
Reset Switch/GPIO Button
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