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Old 02-27-2014, 04:07 PM   #1
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Default power to receiver

ok can i hook up two power supply's to the receiver.
i want to hook up the power from esc and also power from ubec to same receiver. i saw a you tube vidio about how one guy made a fancy thingy to hook up the two and i though why would u need that if you have an emty slot to use.
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Old 02-27-2014, 05:12 PM   #2
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sidybee,

For planes that I use a UBEC, there two methods: 1). On the linear BEC that comes with the esc, disconnect the middle(red) wire and just plug in the UBEC to the throttle port. or 2). Use a Buss-Tie circuit (Shottky) . With this setup, you use both the on board linear BEC and the UBEC. A redundant system. If one fails, the other takes over. pretty cool. Here's a write up on it. A guy over on RCG made up a couple from me as I'm not an electronic wiz.

http://www.rcgroups.com/forums/showthread.php?t=1854050

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Old 02-27-2014, 05:19 PM   #3
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ya dahawk i read that right up on (Shottky) circuit but cant i just instead of using this circuit just plug in the ubec as well as the liner bec with the esc. i cant see why not.
its the same thing except there is no other connection.
i dont see why a bus circuit would be needed in my case as i have open ports on the receiver 6 channel receiver im only using 4 channels so i have two channels open and i dont wanna cut the red wire as i want to use it as back up power along with the ubec....
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Old 02-27-2014, 06:10 PM   #4
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If your BEC uses a switching regulator (which they usually do) then you cant have two power sources hooked up together unless you protect from reverse voltage with the diode.

Her's a wiring diagram from castle which shows the red wire from ESC disconnected, and lots of bold red writing so you dont forget!

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Old 02-27-2014, 06:30 PM   #5
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What Jet said ! LOL. And you don't have to cut the red wire. Just take an exacto knife and let the tip slip under the connector. Raise the plastic up slightly and pull the red wire out. Fold it back and tape it so it's out of the way. You can re-plug it later if you need it for something else.

Personally, I'm excited about the Shottky diode on account of the redundancy but a good UBEC is far better than the cheapo linear bec's that come with a lot of esc's.

Hey, welcome to WF !

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Old 02-27-2014, 06:37 PM   #6
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Originally Posted by sidybee View Post
ok can i hook up two power supply's to the receiver.
i want to hook up the power from esc and also power from ubec to same receiver. i saw a you tube vidio about how one guy made a fancy thingy to hook up the two and i though why would u need that if you have an emty slot to use.

Yup, here you go

Giant Scale Power System:
Battery Backup System
http://www.wattflyer.com/forums/showthread.php?t=63794

As others have indicated, do not directly parallel connect switching type BEC's or a BEC plus a backup battery.


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DennyV
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Old 02-27-2014, 06:40 PM   #7
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Diodes to prevent the 2 voltage regulators from fighting each other... or disable the weaker one.

You can melt down BOTH voltage regulators if they start "fighting" each other.
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Old 02-27-2014, 06:58 PM   #8
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The buss tie circuit is designed so that if the UBEC fails , the linear BEC instantly takes over.
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Old 02-27-2014, 11:57 PM   #9
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Originally Posted by dahawk View Post
The buss tie circuit is designed so that if the UBEC fails , the linear BEC instantly takes over.
ya but in the bus tie there was no diodes of any sort that i saw. i under stand that back feed problem . i was just looking at that dudes wiring of that bus tie circut and though why would you need all that if there was no diodes or anything..........ill have another look but i didnt see anything like that
thank you

edit......never mind i went back to take a look there was a thingy ma bob there my bad Thank you
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Old 02-28-2014, 12:20 AM   #10
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Glad you found it. I'm not an EE or even a good handyman electrician but I was going to send you this: http://en.wikipedia.org/wiki/Schottky_diode German dude invented it.
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