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Originally Posted by lydiasdad
When you leave the red wire in the esc plug, and plug the reciever pack in the reciever, the esc turns on as if it's circuits are being powered by the reciever pack. The esc works fine as far as I can tell, no problems yet and the bec heatsink is cool. That is with the esc's power switch in the off position. The tekin 420 does have a seperate heatsink just for the bec. This esc can handle 24 volts and the manual says to use the heatsink on the bec if using over a certain voltage.
I am sure not all esc's are this way.
Wouldn't a bec have to dissapate a lot of heat when stepping down such a large voltage, even if there is no load?
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Yes, plugging in a Rx pack will power the whole unit if the red wire is intact, sometimes even the BL motor! Most designs using linear regulators use a diode from output to input to prevent issues if the output voltage is higher than the input voltage. So, this allows the Rx pack to feed all the circuits.
Having a dedicated heatsink for the BEC is a good idea. Nice job tekin!
You need a voltage difference
and current to generate heat in a BEC. The heat wasted can be expressed as
W = (Vin - Vout) * Aout. So, even if you have 30v, if there is no current, there is no wasted power: (30v-6v) * 0A. If the ESC itself only draws 50mA, the power loss is pretty small. It's those dang servos that can draw the current, which causes a linear BEC to be so inefficient.