Is this BEC diagram correct?    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version

All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car General Discussions >> Is this BEC diagram correct?
Page: [1]

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
Is this BEC diagram correct? - 11/21/2012 5:12 AM   
jamesfarrell


 

Posts: 23
Score: 100
Joined: 11/10/2012
Last Login: 12/29/2012
From: WorcesterMA, USA
Status: offline 		 Here's what I have

HPI Savage Flux HP. I'm replacing the stock system with a Spectrum DX3C with has the SR300 receiver that can handle 9.6 Volts. 
I have this servo, a JR 8911

http://www.amainhobbies.com/product_info.php/cPath/61_100_2167_2170/products_id/157890/n/JR-DS8911HV-High-Voltage-Ultra-Torque-Servo-Metal-Gear?utm_source=Google-Base&utm_medium=cpc&utm_campaign=Product-Feeds&source=google_ext&gclid=CNyj7vml37MCFdKd4AodhmsARw

I have the stock flux system, ESC and Motor. I have a castle External BEC. The servo is capable of 7.4 Volts. 

So a guy on another forum said this diagram would work. What do you think?






Hide Signatures
       Post #: 1

RE: Is this BEC diagram correct? - 11/21/2012 5:16 AM   
SyCo_VeNoM



Posts: 10680
Score: 626
Joined: 7/3/2007
Last Login: 5/24/2013
From: chicago, IL, USA
Status: online 		no it won't (well might but could cause issues)

you will need the ground(black wire) off the servo to connect to the BEC, and RX. If its not the servo has nothing to associate with ground for the signal and it could be detected as anything.


PERSONALLY I'd just disconnect the red wire that goes to channel 2, and plug the BEC into the BATT spot, and the servo like you normally would into channel 1

_____________________________

With great speed comes greater repair bills.
Look at my garage for my model list.

Hide Signatures

(in reply to jamesfarrell)
       Post #: 2

RE: Is this BEC diagram correct? - 11/21/2012 7:32 AM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline 		I agree, back out the red and black wires from the connector from the ESC, (ie disable the ESC BEC)

Then plug the red and black output wires from the EBEC into the connector from the ESC that u just removed the 2 wires from..

All u need is a pin to back the wires out of the connectors, just lift the plastic tab and they will slide right out.


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to SyCo_VeNoM)
       Post #: 3

RE: Is this BEC diagram correct? - 11/21/2012 10:19 AM   
Foxy



Posts: 17188
Score: 2012
Joined: 3/23/2005
Last Login: 5/24/2013
From: Kingston UK, but living in Athens, GREECE
Status: offline 		As Syco said, just take out the red pin from the esc plug and tape it back, so it doesn't go in the receiver. Attach the battery to the bec, and the bec to channel 3/Battery on the RX.

_____________________________

So, you got a smartphone. You now have virtually unlimited access to the collective acquired knowledge of the entire human race in the palm of your hand, and you use it to... play Angry Birds while sitting on the toilet. Way to go!

Hide Signatures

(in reply to phmaximus)
       Post #: 4

RE: Is this BEC diagram correct? - 11/21/2012 10:44 AM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline 		Ahhh but if u do it my way u have 2 power sources to run fans from
The batt plug on the receiver 7.4v
And the ESC's BEC 6v

One of my cars was like That because I had a 2s lipo capable fan on the ESC and only a 6v on the motor.
Either way works, all depends is u want 2 ready to go power spare sources or none


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to Foxy)
       Post #: 5

RE: Is this BEC diagram correct? - 11/21/2012 1:27 PM   
jamesfarrell


 

Posts: 23
Score: 100
Joined: 11/10/2012
Last Login: 12/29/2012
From: WorcesterMA, USA
Status: offline 		I'm confused guys. I don't need any more fans or anything else. I have the fan on top of the ESC, I want that to still work. 

So is the rest of the diagram correct? All I want to do is provide 7.4V to my high voltage servo. 

So is the diagram correct? But just remove the red (+) wire from the ESC> RX? 

Hide Signatures

(in reply to phmaximus)
       Post #: 6

RE: Is this BEC diagram correct? - 11/21/2012 1:54 PM   
SyCo_VeNoM



Posts: 10680
Score: 626
Joined: 7/3/2007
Last Login: 5/24/2013
From: chicago, IL, USA
Status: online
quote:

ORIGINAL: phmaximus

Ahhh but if u do it my way u have 2 power sources to run fans from
The batt plug on the receiver 7.4v
And the ESC's BEC 6v

One of my cars was like That because I had a 2s lipo capable fan on the ESC and only a 6v on the motor.
Either way works, all depends is u want 2 ready to go power spare sources or none

you need the black wires for common ground all black wires NEED to be tied together somehow(through the RX). I've done this a few times wit my tamiya ESC's that like to pump 8.4V's into the RX. If you don't like I said the electronics will have no idea **** the signal is, and should be without reference.

If you want to do it in a way that you had pictured I modified it properly

to make things easier and neater I'd use a Y-adapter, and just cut the red wire off the end you plug into the RX


but like I said if your RX can take 9.4 volts then you can do it the other easier, neater way which as foxy said just pop the pin out of the plug that goes to the second channel from the ESC cover it with tape, and plug the BEC into BATT or chan 3 with the servo as normal into channel 1.


BTW your original picture technically should work, but without knowing how the companies designed the circuitry unless you take a multi meter and do a continuity check between the black wire that goes to the battery, and the black wire on the plug's black wire that comes off the bec side there is no way to know if they are truly straight connected to the ground. Why I just like to play it more safe then sorry cause if they are not you can add interference to the signal.

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

With great speed comes greater repair bills.
Look at my garage for my model list.

Hide Signatures

(in reply to phmaximus)
       Post #: 7

RE: Is this BEC diagram correct? - 11/21/2012 10:45 PM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline 		I disagree, It does not matter where its grounded, the top wiring diagram will work, its ground through the battery.'
well every thing is grounded to the battery,

there is absoultly no advantage from grounding the servo to the receiver. its allready grounded on a seperate loop to the battery and so is the receiver

im open to the idea, but can u explaine it to me in heapes more detail? to me it just makes no sence.


I still like my way more, is there something wrong with it? and with that way u dont have to buy any extra connectors.
(back out the power wires from the ESC and tape them up, and replace them with the UBEC out put wires, cant get any eaiser than that and u even end up with a spare connector)


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to SyCo_VeNoM)
       Post #: 8

RE: Is this BEC diagram correct? - 11/21/2012 11:06 PM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline

This is the how one of my cars was done. So I know it works.

this is a more complex one that i made for lights and a sero that can draw more amps that the ESC's BEC could supply on but its the same thing.

****NOTE, there is a mistake in this one, The ESC's BEC has not been disconected from the receiver just ignore that part lol



_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to phmaximus)
       Post #: 9

RE: Is this BEC diagram correct? - 11/22/2012 1:07 AM   
SyCo_VeNoM



Posts: 10680
Score: 626
Joined: 7/3/2007
Last Login: 5/24/2013
From: chicago, IL, USA
Status: online
quote:

ORIGINAL: phmaximus

I disagree, It does not matter where its grounded, the top wiring diagram will work, its ground through the battery.'
well every thing is grounded to the battery,

there is absoultly no advantage from grounding the servo to the receiver. its allready grounded on a seperate loop to the battery and so is the receiver

im open to the idea, but can u explaine it to me in heapes more detail? to me it just makes no sence.


I still like my way more, is there something wrong with it? and with that way u dont have to buy any extra connectors.
(back out the power wires from the ESC and tape them up, and replace them with the UBEC out put wires, cant get any eaiser than that and u even end up with a spare connector)

note I said with how its designed without checking.
Believe it or not I've seen step down convertors that didn't share a common ground in stuff I've worked on.

Simplest way is similar to how you done it just back out the red wire on the ESC, tape the end up, and put the BEC into port 3 or the BATT slot. (how I run my TEU104BK's, and was said by foxy)
No idea why you have the external BEC going to the 2nd port with the signal wire off the ESC.


BTW I run those same switches in my TT01E, and SCX10 for headlights

_____________________________

With great speed comes greater repair bills.
Look at my garage for my model list.

Hide Signatures

(in reply to phmaximus)
       Post #: 10

RE: Is this BEC diagram correct? - 11/22/2012 1:19 AM   
savagecommander


 

Posts: 1811
Score: 171
Joined: 1/3/2006
Last Login: 5/12/2013
From: sterling heights, MI, USA
Status: offline 		running the servo through the BEC gives an advantage. just also connect the black wire from the servo to the rx and your good.

Hide Signatures

(in reply to SyCo_VeNoM)
       Post #: 11

RE: Is this BEC diagram correct? - 11/22/2012 3:02 AM   
jamesfarrell


 

Posts: 23
Score: 100
Joined: 11/10/2012
Last Login: 12/29/2012
From: WorcesterMA, USA
Status: offline 		Yep, I did all that with a Y connector. The problem is, I'm running 3s x 2 = 6s

I'm hoping I don't have to rewire it. Too much voltage going to the BEC like that you think? 

Hide Signatures

(in reply to savagecommander)
       Post #: 12

RE: Is this BEC diagram correct? - 11/22/2012 3:07 AM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline
quote:

ORIGINAL: SyCo_VeNoM

quote:

ORIGINAL: phmaximus

I disagree, It does not matter where its grounded, the top wiring diagram will work, its ground through the battery.'
well every thing is grounded to the battery,

there is absoultly no advantage from grounding the servo to the receiver. its allready grounded on a seperate loop to the battery and so is the receiver

im open to the idea, but can u explaine it to me in heapes more detail? to me it just makes no sence.


I still like my way more, is there something wrong with it? and with that way u dont have to buy any extra connectors.
(back out the power wires from the ESC and tape them up, and replace them with the UBEC out put wires, cant get any eaiser than that and u even end up with a spare connector)

note I said with how its designed without checking.
Believe it or not I've seen step down convertors that didn't share a common ground in stuff I've worked on.

Simplest way is similar to how you done it just back out the red wire on the ESC, tape the end up, and put the BEC into port 3 or the BATT slot. (how I run my TEU104BK's, and was said by foxy)
No idea why you have the external BEC going to the 2nd port with the signal wire off the ESC.


BTW I run those same switches in my TT01E, and SCX10 for headlights


I allways though the black servo wire was a connection to the battery via the receiver via the esc?
I'm just trying to understand this stuff in more detail, but why would u link two sepperate power circuits via a earth?
I mean both EBEC and the ESCBEC are both earthed directly to the battery, so why link the earth after the regulation?

Hang on... Is it because in some setups there is a problem with the recivers signal using a different earth, That is within the overall circuit but on a different feed?


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to jamesfarrell)
       Post #: 13

RE: Is this BEC diagram correct? - 11/22/2012 3:09 AM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline 		The CC BEC is rated to 6s max
So that's all good, the CC Pro is good for 12s

http://www.castlecreations.com/products/ccbec.html


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to phmaximus)
       Post #: 14

RE: Is this BEC diagram correct? - 11/22/2012 3:10 AM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline 		Hey SyCo, on those controllers did u worry about stepping the volts town to 5.5v for the controllers power feed?


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to phmaximus)
       Post #: 15

RE: Is this BEC diagram correct? - 11/22/2012 3:29 AM   
SyCo_VeNoM



Posts: 10680
Score: 626
Joined: 7/3/2007
Last Login: 5/24/2013
From: chicago, IL, USA
Status: online 		no ones I got the spec sheet said 30V max. The logic voltage is what was limited to 5.5volts, and as I've never cared enough to go dig my oscilloscope out to check what my signal wire puts out as voltage I just hooked it up and hoped for the best
not sure if they are the same exact one, but they look it (http://www.pololu.com/catalog/product/1210 one I got)



quote:

ORIGINAL: phmaximus

I allways though the black servo wire was a connection to the battery via the receiver via the esc?
I'm just trying to understand this stuff in more detail, but why would u link two sepperate power circuits via a earth?
I mean both EBEC and the ESCBEC are both earthed directly to the battery, so why link the earth after the regulation?

Hang on... Is it because in some setups there is a problem with the recivers signal using a different earth, That is within the overall circuit but on a different feed?

Like I said the BEC's should already be grounded properly in the OPs pic, but I've hit some electronics where they weren't, for some stupid reason the designer thought it was best to isolate the - output for some odd reason from the - input.

The reason to link the grounds is to make 100% sure there is one common point for the electronics to gauge the signal level from. In all honestly its just as a backup in this instance to make sure there is a common reference point in case the manufacturer didn't do it right on the ESC's BEC, or the UBEC's didn't. When I was in college and had to bread board similar circuits you could not imagine how much of a difference a common ground made with signals. Like I remember signals without grounds hooked up right being like 2 volts off from what it should have been, and jumping around due to interference.

Now if he wants to take a multimeter and do continuity test from the black wire that goes to the battery, and the black wire on the leads that come off the BEC and make sure they both go straight through then yes his 1st pic would be valid if the are connected.

_____________________________

With great speed comes greater repair bills.
Look at my garage for my model list.

Hide Signatures

(in reply to phmaximus)
       Post #: 16

RE: Is this BEC diagram correct? - 11/22/2012 3:54 AM   
phmaximus



Posts: 4185
Score: 627
Joined: 6/8/2008
Last Login: 5/24/2013
From: Adelaideaustralia, AUSTRALIA
Status: offline 		That's handy to know about those picco switches, cheers heaps, mind u the regulators are cheap as chips from hong kong

That makes sence, I wonder if anyone had had any problems with the modern receivers, ESC, BEC, and servos. And I wonder if some servos are more sensitive to interference? Got any idea of what types of interference they mainly suffer from?


_____________________________

Losi Micro SCT,5IVE,8IGHTe
Tamiya BajaKing,TA01R,TL01B

Hide Signatures

(in reply to SyCo_VeNoM)
       Post #: 17

RE: Is this BEC diagram correct? - 11/22/2012 4:07 AM   
SyCo_VeNoM



Posts: 10680
Score: 626
Joined: 7/3/2007
Last Login: 5/24/2013
From: chicago, IL, USA
Status: online
quote:

ORIGINAL: phmaximus

That's handy to know about those picco switches, cheers heaps, mind u the regulators are cheap as chips from hong kong

That makes sence, I wonder if anyone had had any problems with the modern receivers, ESC, BEC, and servos. And I wonder if some servos are more sensitive to interference? Got any idea of what types of interference they mainly suffer from?

it would probably be the signal either not being strong enough to be read, or attenuating causing it to act up.

and yea I know the regulators are cheap just wanted the circuit as simple as possible.

_____________________________

With great speed comes greater repair bills.
Look at my garage for my model list.

Hide Signatures

(in reply to phmaximus)
       Post #: 18

RE: Is this BEC diagram correct? - 11/22/2012 4:33 AM   
jamesfarrell


 

Posts: 23
Score: 100
Joined: 11/10/2012
Last Login: 12/29/2012
From: WorcesterMA, USA
Status: offline 		So I'm good with the 2 3c batteries?
Using this diagram? I hope so, becasue it's all soldered up, locked down. Turned it on for a few minutes at a time. Nothing smoked yet. 
 
 


Hide Signatures

(in reply to SyCo_VeNoM)
       Post #: 19

RE: Is this BEC diagram correct? - 11/22/2012 3:13 PM   
savagecommander


 

Posts: 1811
Score: 171
Joined: 1/3/2006
Last Login: 5/12/2013
From: sterling heights, MI, USA
Status: offline 		looks good

Hide Signatures

(in reply to jamesfarrell)
       Post #: 20



Page:   [1]
All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car General Discussions >> Is this BEC diagram correct?
Page: [1]





Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


1.516RCU1