The magic TL431 voltage regulator audio amplifier driving a speaker

About an amazing 3 terminal voltage regulator IC that can amplify audio, driving a speaker from a crystal set with few other parts needed.

Sources and further reading:
* https://www.onsemi.cn/PowerSolutions/document/TL431-D.PDF
* http://www.techlib.com/electronics/crystal.html
* http://vu2ppp.com/_simple_audio_amplifier_using_tl431
* http://theradioboard.com/rb/viewtopic.php?t=7920
* http://theradioboard.com/rb/viewtopic.php?t=6733

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