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Thunder Power RC . Mikado . Futaba-RC
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Align T-REX 600N 700N

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7.4v step down for 6v tail servo

towertsk

Senior Heliman

Chula Vista, CA

I'm running ds610s on the cyclic and I have a 650 for the tail. I'd like to run a 2s setup but have a step down before the gyro, since most gyros can't handle 2s input.

Anyone have a solution for this setup?

12-03-2009 Over year old.
Mputu

Veteran

Killeen, TX

I will say it all depends on how much you are willing to spend! You can use the step down to tail like you mentioned or you can get a voltage regulator like SG, that push higher voltage to cyclic and enough for your gyro.

Fly hard, Land safe

12-03-2009 Over year old.
towertsk

Senior Heliman

Chula Vista, CA

Will an align step down drop the voltage enough to gyro and tail to a safe value?

12-03-2009 Over year old.
Mputu

Veteran

Killeen, TX

I am very good with align regulator but I have friends who uses and love it, yes align should work. But it won't hurt to continue the research.

Fly hard, Land safe

12-03-2009 Over year old.
Cameron

Key Veteran

St. Johns, Florida

Will an align step down drop the voltage enough to gyro and tail to a safe value?
No the diode that is used in this step down only drops the voltage by 0.7 volts. These type of stepdowns are designed for 6 volt setups.

Are you trying to run a 2s direct to your cyclic servos? This is a way you can achieve a drop in voltage for your tail servo and throttle servo.
http://www.spektrumrc.com/Products/...rodID=SPMVR5203

Cameron

12-03-2009 Over year old.
HOMEPAGE  
towertsk

Senior Heliman

Chula Vista, CA

Ideally I'd like to run 2s to my cyclics and about 6.5 to my gyro and tail servo.

Sounds like its more hassle than it's worth.

12-03-2009 Over year old.
colsy

Elite Veteran

Cambridge, UK

It's easy peezy m8
Just use the VR 5203 'cameron has given you the link'

col.

Only Quote From Experience.

12-03-2009 Over year old.
HOMEPAGE  
Cameron

Key Veteran

St. Johns, Florida

Gyro and tail servo will not handle 6.5 volts. All you will see is the magic smoke when you plug it up.

12-03-2009 Over year old.
HOMEPAGE  
Zaneman007

Elite Veteran

Texas - USA

You have a couple of options;

Arizonas regulator the Kiwi will allow raw voltage to 4 ports and regulate the other ports to 5 volts.

Spectrums VR5203 Dual Output Regulator will regulate two outputs to 5 volts, allowing you to plug the battery directly into the Rx.

Spectrums AR7100R, it has the VR5203 built in. Thus allowing you to run the 7.4 lipo directly to the Rx.


Caution, hook these up wrong and you may fry some electronics. A simple step down will not work for the application you have described.

Old Guys Rule!

12-03-2009 Over year old.
towertsk

Senior Heliman

Chula Vista, CA

Gyro and tail servo will not handle 6.5 volts. All you will see is the magic smoke when you plug it up.
really? A 5 cell battery fully charged is almost 7V. I'm sure during normal use it's well above 6V. I know some gyros are more sensitive to higher voltages.

12-03-2009 Over year old.
colsy

Elite Veteran

Cambridge, UK

Yes really!!.
Point is you wont see it when you plug it up, but be-sure they wont last long.

search and you shall find.

col.

Only Quote From Experience.

12-03-2009 Over year old.
HOMEPAGE  
Cameron

Key Veteran

St. Johns, Florida

Let me know how it goes.

12-03-2009 Over year old.
HOMEPAGE  
jschenck

rrProfessor

La Vista, NE.

Gyro and tail servo will not handle 6.5 volts. All you will see is the magic smoke when you plug it up.
Depends on the equipment. I have a year with a Thunder Tiger TG7000 and DS0606 gyro/tail servo combo running straight A123 cells to them. I have about 6 months and 5 gallons on my T700 running a Futaba 520/Hitec 6965 on the tail, straight LiFePO4. Both these packs come off the charger at 7.4V.

Team GrandRC

12-04-2009 Over year old.
jschenck

rrProfessor

La Vista, NE.

A 5 cell battery fully charged is almost 7V. I'm sure during normal use it's well above 6V.
6V is my 'stop flying' voltage on 5 cell NiCD and NiMH packs. ~1.2V/cell is the stop flying. 4.8V on a 4 cell pack.

Team GrandRC

12-04-2009 Over year old.
David Blain

Key Veteran

Mt. Dora, Florida (USA)

On my 700NSP, I'm running straight 7.4v 2S into the JR921 receiver!
Cyclics are Align 610's, Throttle is Aligns 620,
Gyro is Inertia... All running direct in 7.4 volt 2S!

Only thing "stepped" down with a Specktrum VR502 is the tail servo that is a Align 650

Flies like a scalded dawg....
"Pour the voltage in and let it eat"

David Blain
T.O.R.C.H.S. Orlando Member

12-04-2009 Over year old.
jschenck

rrProfessor

La Vista, NE.

Only thing "stepped" down with a Specktrum VR502 is the tail servo that is a Align 650
how come? just curious as I thought the 650 was known good at high voltage

Team GrandRC

12-04-2009 Over year old.
TREXSYNDROME

Veteran

Lakeland, Florida-USA

Towertsk, Knowing what I know, I would get the spektrum regulator.

Mark
Trex 700 n
Gaui X5
Vbar 5.3 pro

12-04-2009 Over year old.
towertsk

Senior Heliman

Chula Vista, CA

Thanks everyone for your comments.

My goal was simply to run cyclics at 2S and tail at 6V (DS650).


I'll just go with the AR7100R and run my tail at 5.2v

I wish there was an AR7106R (for 6V tail)

12-04-2009 Over year old.
hootowl

rrProfessor

Garnet Valley, Pa.

I run A123 receiver packs and just a stepdown for the tail. No issues.

Wolves don't lose sleep over the opinions of sheep

12-04-2009 Over year old.
HOMEPAGE  
theflyingman2

Senior Heliman

Winter Haven, FL USA

I'll just go with the AR7100R and run my tail at 5.2v
its amazing, you will love it!

12-05-2009 Over year old.
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Align T-REX 600N 700N

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7.4v step down for 6v tail servo

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