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Just bought a 3A switchable (between 6V and 5V out) UBEC and wired it up. Works like a charm. I touched the Vreg before and after I installed the UBEC and ran it for 5 minutes each. Using the UBEC it was comfortably warm to the touch whereas when we full 8V was passed directly to the Vin on the Vreg...

Thanks!! I thought I did. I just couldn't believe that such a small component could handle a voltage drop of 3.3V so easily. Heat sink is one option but maybe putting a transistor between the battery current and the Vin of the Vreg could also work. Hence back to my first question: How to wire a tran...

Disregard my previous post. It's wrong. Using this as source material (http://www.ti.com/lit/an/slva118/slva118.pdf) I think the AZ117 3.3 Voltage regulator is very much up to the task. If you calculate the power needed to dissipate (Pd) by using Vin - Vout x current draw you get 0.66W. In the attac...

Thanks for the quick response! Quick calculation of the new numbers you provided: 3,3V x 0,2A = 0,66W or 660mW to get rid of in terms of heat. According to the datasheet the thermal resistance of the SOT 223 package is 15 dgr C/W.... Sooo that would mean around a 10 degrees celsius increase in tempe...

Guys, I have been reading. A lot. And there is something that keeps bugging me. I have recently hardwired the dx5e module into my 9x in this way: http://www.rcgroups.com/forums/showthread.php?t=1803096 Basically using the Voltage regulator from the dx4e I convert the 6.4-8V from my double 18650 LiFe...