TBS Discovery power supply
"Permanent solution for getting stable 12V to the FPV transmitter from the 3S/4S main pack. A LM2940 low voltage dropout regulator. This is a linear type voltage regulator, which means that it burns off excess voltage as heat. Linear regulators aren’t as efficient as a switching type voltage regulators. So why use a linear voltage regulator? – The answer is: Noise"
Inspirated by rcexplorer project ( external link)