CC BEC ,design flaw.

Originally Posted by asheck

So here's the story.I was running my Erevo last week and the steering stopped working.I took it in and checked it out,and the servos had just stopped.Checked everything out and it seemed alright.So I thought OK stock servos it happens.Tried a old spare and it seemed to work fine.Put in a Digital Futaba,tested it with a 2s lipo and all seemed fine.Got ready to run on 4s,turned it on and ....smoked it.So I said to myself,could be a bad bec, grabbed my other 1 that I had from my Maxx.(The last time I had drove it my MM smoked)So tried it all out again on 2s and all was fine.Put in my JR servo,loaded up 4s and turned her on....smoke.So now I'm a little upset,slap my Novak system in my Maxx,only to find that it's servo's had been fried when the MM went previously,or perhaps the bad BEC had something to do with it.So at this point I ask on the brushless forum and someone said that when a CC bec fails it can just pass the input voltage stright through.So I finally got around to testing them today and that exactly what happened.Green light still on showing all is good,but they are putting out the same voltage thats going into them.I believe this is messed up.Why put out a product like this with no built in failsafe.I'm out a couple hundred in servos,all over something that IMO should not be able to happen.

this very subject has been discussed before and for this reason I will never use a CC BEC...here are a couple of links to good BECs....I run the Western Robotics High Voltage model

http://www.helidirect.com/product_in...oducts_id=4667

and the Koolflight is a good one also

http://www.hobby-lobby.com/ubec.htm

[VintageMA]

http://www.helidirect.com/product_in...oducts_id=4667

^^^ That is a serious BEC!!!!

I've been running 2 CC BECs since they first came out with no issues on 4 and 5S lipos. I don't remember seeing any of those threads on problems, but I'm a bit concerned now, not so much about the servos but blowing my Nomadio React receivers which have become pretty rare and scarce to get for decent $$ w/o getting gouged on e-bay. I could easily see a fully charged 5S blow a receiver putting >20v through it.