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Author Topic: BEC  (Read 2661 times)

funtimefrankie

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BEC
« on: March 05, 2009, 04:55:39 pm »

I understand what the BEC does when it's part of an ESC, suppling the power to the RX and servos from the drive battery, but what does it mean when a RX marked BEC, and how do you make use of it ??
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andrewh

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Re: BEC
« Reply #1 on: March 05, 2009, 05:06:34 pm »

FTF
It means curiously enuf that the receiver also has a voltage regulator, and can (within reason) sort out 5V for itself even if it is fed with more volts - specifically 6-cell and 7 cell buggy packs

I think it is only found on 27 MHxz receivers (in writing anyway) and I was so concerned I took mine apart and found a 7805 regulator chip - so then I believed!

So if you were running a buggy (or boat) with a 6-cell pack and 2 servos (one usually works a switch or mechanical speed controller) you can feed the full voltage into the receiver.  I am not sure what the servos get in this case, but it worked for the car lads at least till ESCs arrived
andrew
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andyn

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Re: BEC
« Reply #2 on: March 05, 2009, 05:15:11 pm »

Seconded. Until I got a Microprocessor ESC for one of my truggys, it had a mechanical speed control in it, and the Rx sorted out it's own power from a 7 cell Sub-C pack quite happily :-))
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stallspeed

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Re: BEC
« Reply #3 on: March 05, 2009, 06:21:03 pm »

I understand what the BEC does when it's part of an ESC, suppling the power to the RX and servos from the drive battery, but what does it mean when a RX marked BEC, and how do you make use of it ??
The RX bec will probably be 6 volts when you feed in excess of that.
I think the BEC old Futaba receivers use a 5 amp PNP transistor.It has no overload protection.Careful how much current you draw when you feed it with greater than 6 volts.
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maninthestreet

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Re: BEC
« Reply #4 on: March 05, 2009, 07:52:17 pm »

FTF
It means curiously enuf that the receiver also has a voltage regulator, and can (within reason) sort out 5V for itself even if it is fed with more volts - specifically 6-cell and 7 cell buggy packs

I think it is only found on 27 MHxz receivers (in writing anyway) and I was so concerned I took mine apart and found a 7805 regulator chip - so then I believed!

So if you were running a buggy (or boat) with a 6-cell pack and 2 servos (one usually works a switch or mechanical speed controller) you can feed the full voltage into the receiver.  I am not sure what the servos get in this case, but it worked for the car lads at least till ESCs arrived
andrew



The Hitec receiver that comes with the 40MHZ Ranger 2N radio system has BEC.
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Robert Davies

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Re: BEC
« Reply #5 on: March 18, 2009, 12:54:01 pm »


Currently, and successfully in the past, I've used one of these 'Hobbywing Switch-Mode 5V/6V 3A max 5A UBEC' and bypassed any BEC arrangement in ESCs or RXs. Especially when there is a high battery input voltage (more than 6v) or high servo loading (barn door rudder, or steering servo on a rock crawler).

-Rob

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