Tell us about yourself!
its secret hi tech black magic stuff, but basically, if you have step up converter, coil + capacitor serve as "storage" for amplified voltage before its send to output, and yes, it must be there
New Arduino Bluetooth RC Boat
Arduino RC boat
Making an autonomous boat using a Raspberry Pi (WiP)
Boat Autopilot - Based on the Arduino
Pepsi Bottle RC boat
http://arduino.cz/arduino-projekty-uno-wifi-lodick...czech language, use google translator :P