RCCrawler Forums

rerock · 06-11-2007, 03:05 PM

Hey! I'm using the LRP waterproof ESC (for now) along with 2 HiTec 645's and that Futabe 4WD 4ch receiver and a lathe motor...whatever the normal turn is 55? I don't have enough power to use both servos at the same time and still drive forward and reverse. I do not want to add a secondary battery pack to power the receiver; no where to put it. I will be adding a 3rd servo for front dig in the near future. The battery pack I'm using is a 6AA 2400MaH NiMh. What are my options?

Can I just run the reveiver and ESC in paralell off the same pack?

DKNguyen · 06-11-2007, 03:54 PM

I thought receivers and servos can run off of 7.2V?

I like the SportBEC from dimension engineering, but like I said, I think servos and receivers can run off 7.2V.

hairba11 · 06-11-2007, 04:29 PM

I think there is a voltage regulator so you can use the main pack and it will put out like 6v 5amp or something. I dunno where, i've just read stuff here.

DKNguyen · 06-11-2007, 05:01 PM

Well I guess 7.2V is nominal, and that's pushing the upper limit for a receiver I think. Maybe that's why a BEC is used then.

But yeah, SportBEC is what I like. But I'm a robot builder, not a crawler driver (almost said pilot there!).

todd1803 · 06-11-2007, 05:31 PM

Search this section for MPI Regulator. It will solve all your problems.

Grizzly4x4 · 06-11-2007, 05:38 PM

Quote:

Originally Posted by todd1803

Search this section for MPI Regulator. It will solve all your problems.

How To: Installing an MPI voltage regulator

scuzzy51 · 06-11-2007, 05:45 PM

this little doo dad is exactly what your looking for! i believe its only rated to 7 maybe 8 cells so you should be alright! oh and its dirt cheap!!

http://www2.towerhobbies.com/cgi-bin...?&I=LXJJF6&P=7

SVEN · 06-11-2007, 09:23 PM

Quote:

Originally Posted by scuzzy51

this little doo dad is exactly what your looking for! i believe its only rated to 7 maybe 8 cells so you should be alright! oh and its dirt cheap!!

http://www2.towerhobbies.com/cgi-bin...?&I=LXJJF6&P=7

The Novak unit only puts out 3 amps, not enough for the 3 servos he is wanting to use. It is 7 cell max too. It will do 8, but not for long

MPI is the best bet for now. I will be trading in my Novak regulators for the Castle Creations one whenever they decide to release it.

JohnRobHolmes · 06-11-2007, 10:02 PM

I would also recommend the MPI unit for now.

rerock · 06-12-2007, 11:49 AM

Quote:

Originally Posted by Grizzly4x4

How To: Installing an MPI voltage regulator

Thanks bub! I'll get this stuff on order. The only thing that sucks is when I built this chassis, I didn't leave much (well any) room for additional electronics. Luckily that stuff looks small...

freetimecrawler · 06-12-2007, 12:07 PM

And actually the rear steering isn't allowed in competion for a 2.2
You could eliminate that rear servo for now, that should be ok, until you get the dig set-up.

rerock · 07-03-2007, 06:40 AM

Update. I got things wired up and all is well. It works like it should. Thanks all! One question though...If I essentially split the incoming power lead to power both the Rx and ESC seperately, why do I need a voltage regulator? The pot on the regulator is turned all the way up to give the Rx the 7.34vdc. Couldn't I have just saved the $40, the weight, and the wiring and just left it out? All I would've had to do was remove the signal wire from the ESC connector and tapped off the main incoming battery leads.

JasonInAugusta · 07-03-2007, 08:32 AM

http://www.koolflightsystems.com/ultimatebec.htm

Grizzly4x4 · 07-03-2007, 09:07 AM

Quote:

Originally Posted by rerock

Update. I got things wired up and all is well. It works like it should. Thanks all! One question though...If I essentially split the incoming power lead to power both the Rx and ESC seperately, why do I need a voltage regulator? The pot on the regulator is turned all the way up to give the Rx the 7.34vdc. Couldn't I have just saved the $40, the weight, and the wiring and just left it out? All I would've had to do was remove the signal wire from the ESC connector and tapped off the main incoming battery leads.

You could do that, I've done it before. The downside is that when your battery is freshly charged you will be sending over 8 volts to the servos. The Hitec 645's can usually handle this but the dig servo might not if it is a smaller servo. I've burned up a couple good JR steering servos by sending too much voltage to them when wired directly to the 7.2V main battery.

I suggested the voltage reg to you because I didn't want you to burn up a bunch of servos and learn about the problems the expensive way, like I did.

rerock · 07-03-2007, 11:24 AM

That's fair. I was sure there was a reason, but wasn't sure exactly why. What would your suggestion be for a dig servo for that R2? I like nice stuff...

Grizzly4x4 · 07-03-2007, 11:43 AM

Quote:

Originally Posted by rerock

That's fair. I was sure there was a reason, but wasn't sure exactly why. What would your suggestion be for a dig servo for that R2? I like nice stuff...

I use a Hitec HS-81 for my dig setup on my TLT. It has worked great for me.

http://www.hitecrcd.com/servos/show?name=HS-81MG

rerock · 07-03-2007, 02:30 PM

Good to know. Thanks!

06-11-2007, 03:05 PM	#1
rerock Quarry Creeper Join Date: Sep 2005 Location: Minneapolis Posts: 440	BEC issue...what are my options? Hey! I'm using the LRP waterproof ESC (for now) along with 2 HiTec 645's and that Futabe 4WD 4ch receiver and a lathe motor...whatever the normal turn is 55? I don't have enough power to use both servos at the same time and still drive forward and reverse. I do not want to add a secondary battery pack to power the receiver; no where to put it. I will be adding a 3rd servo for front dig in the near future. The battery pack I'm using is a 6AA 2400MaH NiMh. What are my options? Can I just run the reveiver and ESC in paralell off the same pack?

06-11-2007, 03:54 PM	#2
DKNguyen Quarry Creeper Join Date: Jan 2007 Location: Alberta, Canada Posts: 308	I thought receivers and servos can run off of 7.2V? I like the SportBEC from dimension engineering, but like I said, I think servos and receivers can run off 7.2V.

06-11-2007, 04:29 PM	#3
hairba11 RCC Addict Join Date: Mar 2007 Location: St. Louis (High Ridge) Posts: 1,279	I think there is a voltage regulator so you can use the main pack and it will put out like 6v 5amp or something. I dunno where, i've just read stuff here.

06-11-2007, 05:01 PM	#4
DKNguyen Quarry Creeper Join Date: Jan 2007 Location: Alberta, Canada Posts: 308	Well I guess 7.2V is nominal, and that's pushing the upper limit for a receiver I think. Maybe that's why a BEC is used then. But yeah, SportBEC is what I like. But I'm a robot builder, not a crawler driver (almost said pilot there!).

06-11-2007, 05:31 PM	#5
todd1803 Rock Crawler Join Date: Mar 2006 Location: Auburn, WA Posts: 983	Search this section for MPI Regulator. It will solve all your problems.

06-11-2007, 05:45 PM	#7
scuzzy51 Rock Crawler Join Date: Jun 2006 Location: Dallas, Oregon Posts: 567	this little doo dad is exactly what your looking for! i believe its only rated to 7 maybe 8 cells so you should be alright! oh and its dirt cheap!! http://www2.towerhobbies.com/cgi-bin...?&I=LXJJF6&P=7

06-11-2007, 10:02 PM	#9
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	I would also recommend the MPI unit for now.

06-12-2007, 12:07 PM	#11
freetimecrawler Debunking old stereotypes Join Date: Feb 2006 Location: 1st and Amistad Posts: 2,260	And actually the rear steering isn't allowed in competion for a 2.2 You could eliminate that rear servo for now, that should be ok, until you get the dig set-up.

07-03-2007, 06:40 AM	#12
rerock Quarry Creeper Join Date: Sep 2005 Location: Minneapolis Posts: 440	Update. I got things wired up and all is well. It works like it should. Thanks all! One question though...If I essentially split the incoming power lead to power both the Rx and ESC seperately, why do I need a voltage regulator? The pot on the regulator is turned all the way up to give the Rx the 7.34vdc. Couldn't I have just saved the $40, the weight, and the wiring and just left it out? All I would've had to do was remove the signal wire from the ESC connector and tapped off the main incoming battery leads.

07-03-2007, 08:32 AM	#13
JasonInAugusta 06 Super National Champ Join Date: Jun 2004 Location: Stark Industries Bar and Grill Posts: 11,361	http://www.koolflightsystems.com/ultimatebec.htm

07-03-2007, 11:24 AM	#15
rerock Quarry Creeper Join Date: Sep 2005 Location: Minneapolis Posts: 440	That's fair. I was sure there was a reason, but wasn't sure exactly why. What would your suggestion be for a dig servo for that R2? I like nice stuff...

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07-03-2007, 02:30 PM	#17
rerock Quarry Creeper Join Date: Sep 2005 Location: Minneapolis Posts: 440	Good to know. Thanks!

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Thread: BEC issue...what are my options?