WARNINGDo not connect the pin directly to some sort of audio input. The voltage is considerably higher than a standard line level voltages, and can damage sound card inputs, etc. You could use a voltage divider to bring the voltage down, but you have been warned.You MUST have a resistor in line with the speaker, or you WILL damage your controller.
Which circuit is better to use?
however is requires a 33mH inductor,
which I have no clue where to find.