BEC's

[Photex]

Hi All.
Your help is once again reqd please.

I've noticed on several heli sites that BEC's are being mentioned, but, although i know they have got something to do with batteries, I've got no idea what they are, or do. Could you explain them for me please.

Grateful thanks.

Chris.

[Hangar-7]

BEC = Battery Eleminatic Circuit. So if your Electronic Speed Controller (ESC) has BEC this means you would not need a separate battery to power Receiver and BEC will allow a small amount of current/ volt to be diverted from the motor power source to power the receiver.

So overall, weight of the model will be less than a model with a separate battery for receiver. Hope this makess sense.

[helinut]

Battery Ellimination Circuit (BEC) basically takes the feed from the flight pack, and regulates it down to a usable voltage for the receiver pack and servos.
They are normally rated LV (up to 6S) or HV (6-10, or even 12S)
I use Western Robotics HV BEC's on 2 of my machines as it saves the weight of a seperate battery and switch as well as taking away the need to charge another battery.

[Photex]

Thanks Guy's.
Could a BEC be used on a Trex 450 se v2, or would it not be necessary?

Chris.

[Dedcalm]

The ESC with the sev2 has a built in BEC for powering the Rx and servo's, cant think what voltage it is though... dont have one to hand to check (as its a friends heli)

[Rob O]

It's built into the Speed Controller Chris , so is neccessary , if you buy a Speed Controller without B.E.C you will have to run a sepperate 4.8 v Battery mate , so on smaller 450 size Helis make sure the Speedo you buy has the BEC built in . Hope this helps . Rob .

[Made2Fade]

Thanks Guy's.
Could a BEC be used on a Trex 450 se v2, or would it not be necessary?

Chris.

Would certainly take some of the load away from the ESC. What youll need to do is take away the red wire on the ESC RX plug. This will eliminate the ESCs internal BEC and allow you to run an external one.

[Photex]

The ESC with the sev2 has a built in BEC for powering the Rx and servo's, cant think what voltage it is though... dont have one to hand to check (as its a friends heli)

Thanks deadcalm. (I wish it was down here). All these different things and setup's are confusing when you don't know what they are/do, but I'm learning. It's a huge curve, but I'm getting there.

Grateful thanks.

Chris.

[Photex]

It's built into the Speed Controller Chris , so is neccessary , if you buy a Speed Controller without B.E.C you will have to run a sepperate 4.8 v Battery mate , so on smaller 450 size Helis make sure the Speedo you buy has the BEC built in . Hope this helps . Rob .

Thanks Rob.

I was wondering if it was built in. I think I will get a built in controller. Saves a lot of messing about.

Thanks for that.

Chris.

[Made2Fade]

If you bought a UBEC then you wouldnt have to use a seperate battery

http://www.sportsmoto.co.uk/acatalog...oller_ESC.html

Theres a couple on that page where you dont need another battery I use one in my F27C Stryker

[Rob O]

You are very welcome Chris . Rob .

[Photex]

If you bought a UBEC then you wouldnt have to use a seperate battery

Sportsmoto Ltd ESC-speed control/Programmers/UBEC

Theres a couple on that page where you dont need another battery I use one in my F27C Stryker

Thanks for that Lee. So many different ones to choose from. Will have to think about these. LOL.

Chris.

[Twisted]

I use a Medusa 2amp 5 volt BEC as it takes a load of the ESC, also if the ESC fails i will still have control of the RX servos ect. plus i think i you read the spec of your becs onboard of your ESC, they support up to so many servos, so a seprate BEC in my view is a good fail safe!

[Made2Fade]

Certainly would have saved the 9650 when Mattydreds 500 ESC went up in smoke. Brand new ESC too. It took out the servo with it. This was because the BEC is built into the ESC. Wouldnt have happened if an external one was used. So adding an external BEC is a good failsafe as has been already said

[j_js1]

There's also two types of becs aswell, you can get linear or switching. The latter is much more efficient and is recommended for high voltage setups since it can deliver the same amount of current at higher voltages.