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https://www.youtube.com/watch?v=anxqgO2BamE
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https://www.instructables.com/id/ILC1-18L-Clock
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https://www.cnx-software.com/2018/01/...low-power-boards-with-a-18650-battery
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http://hackaday.com/2017/03/17/are-yo...ack+a+Day%29&utm_content=Netvibes
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https://github.com/esp8266/Arduino
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http://www.georgegardner.info/electronics/class-d-avr.html
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http://www.circuits.dk/calculator_planar_coil_inductor.htm
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http://mightyohm.com/blog/2014/11/a-s...ide-to-the-sbm-20-geiger-counter-tube