I had a PDB go south on me the 5v bec no longer works! But I have a old Losi voltage regulator and it seems ok with the 12v from PDB. But it puts out exactly 6v and SPR f3 is a 5v FC. Do you guys think the single volt will cause a issue or at least what would you do if you had a 3 day weekend and nice weather but grounded until WED and using it would get me flying? My son got a FPV setup for Xmas and now I am watching him! LOL! Any advice or opinions or a DYI BEC guide would be appreciated! Thanks!

In the manual here.

Quote:Do not use a voltage source higher than 5.0v. Check your 5v suppy is actually outputting 5.0 volts, check it before powering the FC - do not just assume it is 5v. 

I would say not to use a 6 volt supply.

I would not recommend it, but you can drop voltage with a simple resistor. The only problem, there is no spec on the FC amp draw, so it is difficult to figure out how much resistance to put in.

(31-Dec-2017, 06:54 AM)voodoo614 Wrote: I would not recommend it, but you can drop voltage with a simple resistor. The only problem, there is no spec on the FC amp draw, so it is difficult to figure out how much resistance to put in.

The current used by a flight controller is not static. Just like any microprocessor, the F3 MCU on the SPRF3 flight controller will draw current which is constantly changing, depending on what the CPU is doing. Therefore, using a resistor to reduce the voltage is unworkable.

The better way to reduce the voltage would be to put a 1N4001 or similar silicon rectifier diode in series with the positive line of the 6V supply. Most diodes of the 1N series will drop 0.7 volts. This would at least bring the voltage down from 6V to 5.3V which should be tolerated by the flight controller and peripherals.