RunRyder RC
WATCH
 1 page 1144 views POST REPLY
HomeClassifiedAircraftHelicopterClassifieds - ElectronicsOther Sold  5.1V two-way step down voltage regulator-sold
10-24-2014 04:53 PM  3 years agoPost 1
gotrcfever

rrNovice

Midwest

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

Align Part# K10381A

selling 2 new unused for $ 10.00 shipped

PM  EMAIL  Attn:RR  Quote
10-27-2014 02:21 PM  3 years agoPost 2
gotrcfever

rrNovice

Midwest

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

bump

PM  EMAIL  Attn:RR  Quote
10-28-2014 03:51 PM  3 years agoPost 3
gotrcfever

rrNovice

Midwest

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

bump

PM  EMAIL  Attn:RR  Quote
10-29-2014 12:42 AM  3 years agoPost 4
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

My Classified Activity
No Classified Feedback
Add Classified Feedback

So that's the one for use with a 2S battery?

PM  EMAIL  Attn:RR  Quote
10-29-2014 01:02 AM  3 years agoPost 5
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

My Classified Activity
No Classified Feedback
Add Classified Feedback

I looked it up...it's indeed for use with a 2S battery, and not a 6V system.

PM  EMAIL  Attn:RR  Quote
10-29-2014 02:47 AM  3 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

I looked it up...it's indeed for use with a 2S battery, and not a 6V system.
Well, no.

The Align K10381A does nothing more than give you a typical 0.7 volt reduction in voltage at the output (nominal voltage drop across a forward biased silicon junction).

The instructions that come with it show it connected between the OUTPUT of an Align RCE-B6X regulator, and a receiver or servo designed to run from the older 4.8V nominal NiCad/NiMH battery power source.

In the days of the standard Nicad or NiMh battery pack, the flight packs were 4-cell packs, having a nominal voltage of 1.2 volts/cell. This is where the "4.8" volt number comes from -- 1.2 x 4 = 4.8. These packs, fresh off a charge, might output up to 6.0 volts briefly, until their initial peak charge bleeds off. They will remain relatively stable over the majority of their discharge curve, at 4.8 volts, finally ending up at about 4.4 volts for a pack that's considered fully depleted.

-----

The output of the RCE-B6X is 5.8 VDC. Putting this little devil between the output of that regulator and your RX/servo will allow you to operate them from a nominal 5.1 VDC source.

Were you to install this device between the output of a 2S LiFe battery and your servo, you'd be running your servo off a nominal 5.9 VDC source (6.6 - 0.7 = 5.9). 5.9 volts is about a tenth of a volt higher than the maximum recommended voltage for an S9254 tail rotor servo. The initial output voltage will be quite a bit higher, as a fully charged 2S LiFe has an output voltage considerably higher than 6.6 VDC.

If you stick this between a 2S LiPo and your 4.8 volt servo, you'll be feeding it 7.4 - 0.7 = 6.7 VDC. Your 4.8 volt servo won't be happy for very long. A fully charged 2S LiPo will be at 8.4 volts, and with this diode in series, your 4.8 volt servo will be terribly unhappy at 7.7 volts.

-----

It would not be wise to use this device alone to run a 4.8 volt rated tail rotor servo and a 2S LiFe or LiPo pack.

-----

Sorry to be long winded in a for sale post, but I'd hate to see someone buy this, hoping to use it with a 2S LiFe or LiPo and a 4.8V servo. That would do neither the buyer nor the seller any good.

-----

This little device is GREAT if you're using a 6V output regulator and a tail rotor servo good for 4.8 volt operation. I've been using several of these for years with great success.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2014 04:27 AM  3 years agoPost 7
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

My Classified Activity
No Classified Feedback
Add Classified Feedback

Dk, no offense but I disagree with that...

One reason, here's the Align link:

http://www.alignrcusa.com/index.php...products_id=367

Referring to the center "pic"....below the "listing tab", it shows this "step down" being used with a 7.4V system.

In addition, there is a website selling this product, that shows an image of this "in the package" with its instruction sheet.

On the "sheet", one can see "for 2S LiFe" or something like that.

For the voltage drop of a typical diode, the drop is more like 1V at its max. current rating, as their typical current/voltage curves show.

So, for the Align K10381A, according to the Align diagram...."stepping down" 7.4v to 5.1V would require 2 diodes in series to provide the ~2V "step down".

If you supply 6V to the Align K10381A, you will get 4V out at peak current loads.

Dk, your analysis would be correct(other than the .7V versus 1V disagreement)...if it were a single diode.

I have used the Align K10381A, and it's a great product...
But if you cut off the heat shrink and look at the wiring of the 2 diodes, you will see.

Have no clue why they use such misleading terminology.

As I mentioned, I have used the Align K10381A and it's a good product.

And this seller is selling a quality product, as described.

My point was that it shouldn't be used to "step down" a 6V source expecting to be at 5.1V.

Align used to make a "single diode" step down...in a similar configuration, but I can't rememer the Align part#....which was ideal for stepping down 6V to 5.1V....

To recap:

Align K10381A(uses two diodes in series) = use a 7.4V source

Align #?(uses one single diode) = use a 6V source

FWIW

PM  EMAIL  Attn:RR  Quote
11-02-2014 02:42 PM  3 years agoPost 8
gotrcfever

rrNovice

Midwest

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

bump

PM  EMAIL  Attn:RR  Quote
11-10-2014 03:45 PM  3 years agoPost 9
gotrcfever

rrNovice

Midwest

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

bump

PM  EMAIL  Attn:RR  Quote
12-13-2014 12:56 AM  3 years agoPost 10
fastrc1

rrKey Veteran

Planet Brooklyn, NY-USA

My Posts: All  Forum  Topic

My Classified Activity
My Classified Feedback
Add Classified Feedback

Payment sent

RIP Roman Pirozek Jr.
Team Futaba USA
Team Kontronik USA
http://flysrw.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 1144 views POST REPLY
HomeClassifiedAircraftHelicopterClassifieds - ElectronicsOther Sold  5.1V two-way step down voltage regulator-sold
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Classifieds › HELP-FAQ
Attention Buyers! To receive feedback Post Reply in the seller’s topic. The seller can then click your post's Add Classified Feedback link.
Attention Sellers! Stating price is not mandatory but recommended. Post Reply commentary that interferes with the selling process (and not replied to) will be removed upon request. Click Attn:RR on the offending classified post. Repeated NIB-NIP sales are not allowed. Take it to EBay.
Buyer Beware! RunRyder cannot vouch for any seller's or buyer's credibility and will not accept responsibility for any transactions resulting from the use of this site.

Tuesday, September 25 - 4:28 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online