Puput Dani'e

http://surya-management.blogspot.co.id/2011/05/cara-menggunakan-oscilloscope-tekhnik.html?m=1

http://zonaelektro.net/motor-dc/

https://forum.arduino.cc/index.php?topic=73095.0

https://klinikrobot.com/mobile-articles/126-7-hal-yang-perlu-diketahui-tentang-motor-dc-gearbox.html