Attempt at cheap homemade version of Harmony

[watageek]

LM7805 are super stable, but sooooo unefficient! Can't believe they still put them on modern RC stuff... They tend to heat up so much that they end up messing with the servo signal when the chip overheats... For flying stuff, it means a crash! Also, When there is a much larger load on the battery (ie. motors), the 7805 starves current and servos/receiver have issues.

Actually they are perfect for a low consumption device where efficiency is not a concern. Super Cheap in a Super small package and self protected for overload and heat... You can even add an big PCB with vias (or a heatsink) to compensate for a bad design . Truly awesome in that aspect.

An oscilloscope can be handy to know the capacitor needed on the LDO output. I put some big low ESR just to be sure because I don't have an oscilloscope and my setup can see some high and low spike since it uses regenerative braking with a high speed brushless.