My goal is to get clean 12v power to a Tarot Gimbal from my 4s Lipo Battery.
So many options! Any help appreciated!
I just installed my Tarot T-2D on my F550 a few days ago. I am using this UBEC from HobbyKing, and I also share the power to my FatShark 600mA Transmitter. I also put a 470uF 25V capacitor on the output of the UBEC.
I did not do a full test yet... I went out this weekend to test my Tarot, and I got good results, but I did not check the video of my FatShark to see if it interferes with it...
One day I should connect the power output to my oscilloscope and test it, but I don't know when I will have time for that...
But in theory, everything should work because the Tarot has it's own power regulators, and also the FatShark has to bring down the voltage to 5V, so even if the input power fluctuates, at the end, after the UBEC and also their own regulators, the final output should be a clean power for what they need to do... So doing anything extra on top of what I already done it does not really make sense...
By the way... if you want to get a ~2V dropout voltage, then you can also use diodes. Most diodes have 0.7 drop voltage, so if you put 4 diodes in serries then it drops 2.8 volts. So when the 4S battery is discharged (about 14V) then you get 11.2V, and when the battery is fully charged at 16.8V, then you get 14V output. And of course, it's always good to put a capacitor on the output of the diodes.
Just remember that the Tarot has it's own voltage regulator, so you don't have to be perfect... the FatShark on the other hand, even though it has it's own regulator, I've read on the forums people complaining about input interference, so I think it is much more important to get a clean voltage on that!