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04-04-2015 01:14 AM  6 years ago
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heliraptor10

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kokomo, in-US

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Capacitors in your RX?

Out of concern for a brown out (I believe ) that brought down my e550 once upon a time, I'm wondering about using one of these for my G500 with Talon90.
Further more, this appears to be just a capacitor wired into a servo lead.
Couldn't I just solder up a capacitor myself ?
What would the voltage and Mfarad rating need to be ?
Goblin! where have you been all my life?
RC helis, the original fidget spinners
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04-04-2015 01:27 AM  6 years ago
EEngineer

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TX

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What would the voltage and Mfarad rating need to be ?
It's on the cap that's in your pic.....
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04-04-2015 02:06 AM  6 years ago
mcfast

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Quebec Quebec Canada

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As you can see on that cap it is 10 volt's and 4700 M farad.P.S. sorry for the spelling or the grammar I am dyslexic!
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04-04-2015 02:42 AM  6 years ago
heliraptor10

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kokomo, in-US

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Right...I have tons of old ESC s and such on hand that I've kept for the leads. I don't pretend to understand the farad thing so I was wondering what that means as it applies to how far I could stray from those numbers.

I mean it's not going to provide voltage that it isn't fed in the first place, so it could be different within reason right ?
Goblin! where have you been all my life?
RC helis, the original fidget spinners
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04-04-2015 03:42 AM  6 years ago
EEngineer

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TX

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I mean it's not going to provide voltage that it isn't fed in the first place, so it could be different within reason right ?
Sure.....but in the pic, it's a 4700 uF cap...not MFarad cap.

It's specifically a 10V(max), 4700 uF, electrolytic capacitor...temp. range not lower than 0 deg. F....because its "electrolytes" will freeze.

You want the voltage to be above that of the voltage to your RX/FBL....could use a 15 or 25V(or higher) cap of that type.

Have seen some using 6800 uF, etc.

The energy in a cap. is(in Joules) = C x V x V / 2

If you suspect your servos exhibit "back EMF", you would go for the increased max voltage...25V or more...or the cap. will be overvoltaged...and also that a cap. cannot solve a "back EMF" issue(but that's another issue)...

Without using an O-scope to examine your specific situation, it's hard to determine whether it will help/hurt...other than does it work or not.
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04-04-2015 03:48 AM  6 years ago
EEngineer

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Perhaps you have a buddy with access to an O-scope.

He'll be able to help you decide if it's helping anything.

FWIW
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04-04-2015 05:34 AM  6 years ago
ICUR1-2

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Ottawa, Ontario

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when it comes to caps voltage doesn't matter as much as long as it higher voltage than what you need you could use 110V 1 farad vs 6v 200mfarad

think of the farad rating as mili amps the closer you get to 1 farad compared to 1 amp the higher the capacitance .

however your system should be set-up not to require an external storage device
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04-04-2015 05:51 AM  6 years ago
EEngineer

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when it comes to caps voltage doesn't matter
Are you sure about that?.....
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04-04-2015 12:08 PM  6 years ago
ICUR1-2

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when it comes to caps voltage doesn't matter
Are you sure about that?.....
yes as long as the voltage rating is higher than needed you're safe. I used 1 farad as an example

http://www.digikey.ca/product-detai...T4KI-ND/1587381
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04-04-2015 12:43 PM  6 years ago
dgoss999

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Take a bit of care with these larger capacitors you are putting across the Receiver supply, you don't start ruining your power switch with the surge arc as the on/off switch closes.

Be sure to replace the power switch at regular intervals..

EDIT.. Ignore above - Sorry, I didn't take in you were not on a battery. A regulator switch (on/off enable) will outlive you!!

DG.
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04-04-2015 02:43 PM  6 years ago
heliraptor10

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I was using m to mean micro farad. I'm just wanting brown out insurance...I could go with a flight pack. But I'm going to be running 6v servos.Goblin! where have you been all my life?
RC helis, the original fidget spinners
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04-04-2015 03:21 PM  6 years ago
ICUR1-2

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Ottawa, Ontario

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The best insurance against a brown out is to have a BEC or regulator capable of supplying your set-up. I recommend using a unit that can provide at least 10 amps for peace of mind.

I have used the align 2in1 on my nitro model though it is not the best unit on the market it has worked well so far.
On my electric models 500 and lower in size, I have used the internal ESC BEC which are usually 5 amps.

Again for your peace of mind get a Quality external 10amp>+ BEC

I would not bother with using a capacitor for this purpose

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04-04-2015 03:36 PM  6 years ago
dkshema

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Cedar Rapids, IA

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It is time for a reality check.

You have a Trex 550e. It has a Talon 90 ESC, which has one of the most capable built-in regulators for ESCs with internal BECs on the market.

You're worried about "brownouts".

The capacitor you posted came about in the early days of 2.4 GHz systems when most people were beginning to install digital servos AND continue to use 4-cell Nicad/NiMh packs, with long leads and even switches in the loop. Those days are gone.

Brownouts are due to using voltage requlators that are incapable of providing adequate current for the demand. The regulator you have doesn't fall into that category.

What you are contemplating is a waste of time, energy, and money. Build your heli, plug in the Talon, program it to at least 6 volts, and go fly.
-----
Dave

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

Team Heliproz
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04-04-2015 05:46 PM  6 years ago
G.Stone

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Thompson, Pa. USA

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+1

He's right you know. We have given many solid ideas on this subject and you seem to ignore them

In my experience with a Talon 90, I can't even get it warm.

I have a Talon 35 in a 450 sized chopper and same thing. Not even warm.

Perhaps, you have been given Bad Kool-aid from the other web-site.

Some people just can't stand CC.

We don't want you too crash your bird, bro, good advice.

Have fun and fly.
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04-04-2015 06:43 PM  6 years ago
heliraptor10

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I have a goblin 500.
My brown out was years back on an e550.
I'm gonna give it a go...and just watch my temps.
I was just considering an external BEC to reduce the load on my ESC. Because I've flown birds where an external BEC was the difference between flying and and dropping out of the air due to an ESC overheating. Yes they were cheap.
This goblin is the first bird of this caliber for me, so I'm trying to take every reasonable precaution I can.
Goblin! where have you been all my life?
RC helis, the original fidget spinners
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04-04-2015 06:53 PM  6 years ago
dkshema

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Cedar Rapids, IA

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Talon 90 BEC...

20 amp peak, 9 amp continuous. Put it where it will get some cooling air, go fly.

If it gets hot, it's not the BEC that's doing it. That would be the amps the ESC is pumping through the motor.
-----
Dave

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

Team Heliproz
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04-04-2015 07:53 PM  6 years ago
heliraptor10

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Yeah I plan on locating it on the side. I for one like being able to see the big fat wires. They remind me of how large exhaust pipes are indicative of the power possessed by the vehicle.Goblin! where have you been all my life?
RC helis, the original fidget spinners
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04-05-2015 08:52 AM  6 years ago
EEngineer

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TX

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yes as long as the voltage rating is higher than needed you're safe. I used 1 farad as an example
With so many nonsense post you make eengineer that's why your upto 8 ignores
Your example is false....

There is no 1F cap with a voltage rating above 2.6V.

What nonsense are you trying to have people believe?...

No offense intended....I just disagree with your opinion.
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04-08-2015 10:40 AM  6 years ago
Richardmid1

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Leeds, England

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I think the problem with the Talon 90 in a 550 is the fact it only uses one lead/plug to power the RX and a 550 uses 4 full size high power digital servos!

Im sure 60% of the time it will work every time! Could still cause a brown out if you weren't careful though especially if you have a dodgy servo that decides to pull a load of current!
60% of the time, it works every time!
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04-16-2015 09:20 PM  6 years ago
RM3

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Killeen, Texas - USA

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you know for a user name of EEngineer... you should check your data...

capacitors are available well into the 10F range and rated at over 20 volts now...

here is a 2.2F rated at 20 vdc by the way...

http://www.ebay.com/itm/like/170814705974

Yeah its the size of a Red Bull Can, but you did not mention that it needed to fit comfortably in a RC heli...
showing a preference will only get you into trouble, 90% of everything is crap...
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