Harlen Posted July 15, 2014 Share Posted July 15, 2014 Quick question if anyone can help, I've just confused myself. So I'm going to be buying 2S lipo, but I can't find a servo more than 6V, 7.4V rated ones are sparse and expensive. I then looked into what i'll be running for my transmitter and reciever and they are mostly low voltage rated too, less than 7.4 I've read a few threads and the way to repair it is with a BEC in the middle? But that can require all sorts of splicing, or a seperate pack altogether, and will clog up my limited space. My ESC has a 'built in 6V/3A' BEC, does this mean it will automatically drop the voltage from my battery to my reciever and servo through the ESC so I don't blow everything up? The ESC is the SKyRC Cheetah 60A, paired with the Cheetah 13.5T motor. Further, I assume this doesn't mean I can't run 7.4 at all on the ESC, it won't just turn all voltage down will it? That would be a bit of a pain. Cheers Quote Link to comment Share on other sites More sharing options...
Noj Posted July 15, 2014 Share Posted July 15, 2014 Correct, the onboard BEC regulates the voltage to the servo and rx. Certain applications warrant the use of a separate BEC wiring in (an simple job tbh), such as using high torque servos (savox) or on escs which are known to have a weak onboard BEC. So yes, run a 2s, 7.4v lipo on your esc and receive the full power it can supply, being mindful of course to ensure your lvd is working, to check temps and gear the set up accordingly Quote Link to comment Share on other sites More sharing options...
Harlen Posted July 15, 2014 Author Share Posted July 15, 2014 Correct, the onboard BEC regulates the voltage to the servo and rx. Certain applications warrant the use of a separate BEC wiring in (an simple job tbh), such as using high torque servos (savox) or on escs which are known to have a weak onboard BEC. So yes, run a 2s, 7.4v lipo on your esc and receive the full power it can supply, being mindful of course to ensure your lvd is working, to check temps and gear the set up accordingly Cheers for that! I'm on a tight-ish budget but the thought of having to run high power servo and rx was making me scared of what my budget might become. Are most recievers just 6v or so, i'm finding it hard to get proper specs. I'm only looking at budget sub Quote Link to comment Share on other sites More sharing options...
Tug Posted July 16, 2014 Share Posted July 16, 2014 Spektrum claim 9v for their Rx, that's what my paperwork claims. If you do suffer "brownout", a Rx cap can usually cure it. Setting the steering end points is important too, so that you don't overload the servo and subsequently overload the BEC causing brownout. Quote Link to comment Share on other sites More sharing options...
Noj Posted July 16, 2014 Share Posted July 16, 2014 I ran 7.4v thru a futaba Rx without issue too, 6v through others. Quote Link to comment Share on other sites More sharing options...
Harlen Posted July 16, 2014 Author Share Posted July 16, 2014 Thanks again guys. I ordered a Bluebird 6v servo last night that looks perfect for my needs (good torque, low response). Planning on buying this rc setup http://www.modelsport.co.uk/etronix-pulse-f.h.s.s-ex3g-2.4ghz-steerwheel-/rc-car-products/38734 I can't find any specs about it but is it safe to assume I won't blow the receiver up? Quote Link to comment Share on other sites More sharing options...
Noj Posted July 16, 2014 Share Posted July 16, 2014 The Rx will be fine Quote Link to comment Share on other sites More sharing options...
Harlen Posted July 16, 2014 Author Share Posted July 16, 2014 Thanks for all your help guys I'm now out of questions Will order the last couple of bits and get to work! 1 Quote Link to comment Share on other sites More sharing options...
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