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Old Mar 08, 2015, 04:48 PM
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9g servos

Hello Guys,
I just got back into rc and had a chance to purchase a used F16 ( 55" length). The seller told me that the 5 of the 7( 9 g ) servos got burnt. I replaced the servos but noticed that the ESC is connected to the receiver directly. My question is if the 6V servos get juice from from the ESC which is fed by a 3s battery, Am I going to burn the new servos again due to too much voltage? Do I need to protect the servos with some sort of a volt limiter? I appreciate any kind of help as I have limited knowledge of electronics.
Thanks, Solly
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Old Mar 08, 2015, 05:08 PM
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I meant 5s battery.
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Old Mar 08, 2015, 05:49 PM
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you might want to try here,

http://www.rcgroups.com/beginner-tra...ft-electric-8/

I had a F-16 and burnt out all the servos with a faulty Receiver......

it could also be your ESC, im not a techy kind of guy , what i would do is test the esc with one new servo and if it burns, then its your esc. or ask in the above forum maybe find your answer there. sorry i couldnt help more

sovrin
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Old Mar 08, 2015, 06:54 PM
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9 g servos

Thanks a lot
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Old Mar 08, 2015, 07:00 PM
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The ESC must have a built in BEC to power your receiver and it is likely producing close to 5v. To be sure, you might want to hook up a receiver voltage meter. These Towerpro receiver voltage testers are dirt cheap on eBay but work well. There is even a switch on the side to select 4.8 or 6v range. I doubt that the ESC damaged the servos as I've never seen one produce too much voltage (usually it is under voltage). Unless it is the type with selectable output voltage, and too high was selected, but they are clearly marked.
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Old Mar 09, 2015, 02:31 PM
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Is it possible for an ESC not to have a built in BEC? From what I've read so far on the subject I think that a lack of a UBEC caused the servos to burn. At this point I want to add a UBEC to the system . Am I on the right track ?
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Old Mar 09, 2015, 03:07 PM
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Yes the OPTO type of ESC have no BEC but they wouldn't put any power to the reciever at all. Nothing would be harmed. Perhaps the previous owner plugged his servo leads in upside down?
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Old Mar 09, 2015, 07:46 PM
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About a year ago i had a Spektrum 6channel mini receiver, it simultaneous burned out 6 servos , i had it sent back and sure enough it was the RX, they of course let me be on my own with the burned out servos. Thats when i sold my DX8 and got a Taranis......LOL the Frsky is friggen killer, for 200bucks and it does more than a 800buck decked out JR....do the math
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Old Mar 09, 2015, 10:21 PM
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Quote:
Originally Posted by 4stripes View Post
Yes the OPTO type of ESC have no BEC but they wouldn't put any power to the reciever at all. Nothing would be harmed. Perhaps the previous owner plugged his servo leads in upside down?
Plugging servos in wrong wont burn them out
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Old Mar 10, 2015, 06:28 AM
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thanks, I never tried that!
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