Audio amplifier

SOURCE:

https://picpicdekpic.online/%D1%83%D1%81%D0%B8%D0%BB%D0%B8%D1%82%D0%B5%D0%BB%D1%8C-%D0%BD%D0%B8%D0%B7%D0%BA%D0%BE%D0%B9-%D1%87%D0%B0%D1%81%D1%82%D0%BE%D1%82%D1%8B-%D0%BD-2/

https://www.instructables.com/id/DIY-Motion-Detection-SMS-Alarm-System/

https://medium.com/@amyleeanne/from-0-to-a-smart-mirror-in-6-months-ee3b91f723b1

https://www.instructables.com/id/ATtiny-Watch-Core/

http://www.technoblogy.com/show?1Y7J

http://www.technoblogy.com/show?1MG3

https://www.instructables.com/id/DIY-Arduino-Watch-Sport-20/?utm_content=buffer869d4&utm_medium=social&utm_source=pinterest.com&utm_campaign=buffer