Fail safe BEC?

[BrianG]

I'll see what I have in my parts bin and rig up a little prototype. Beta version is "coming soon". (Taking a page from CC's book - j/k Castle guys... I just HAD to say it. )

Why can't I run two BEC's in series (fist at 7V out, second at 6V), with maybe an LED/Resistor in series between the two set up such that the LED won't light unless the voltage out of the front end BEC is over some critical point?