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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › JR servo voltage specs?
09-06-2006 10:17 PM  14 years ago
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mattie-lodge

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Southampton, UK

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JR servo voltage specs?
Hi All,

Does anybody have any idea where I can find the voltage specs of my JR servos. I have x2 DS8231's and one DS8511 which I am just about to run of off a reg and want to know what voltage to set the reg up to?

Cheers

Matt
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09-07-2006 01:50 AM  14 years ago
JRMAN

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Macedon, New York

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6.0 is good. I had a talk with a design engineer from JR and he said the JR DS servos are good for much more.

The less time I have the more I get done.
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09-07-2006 08:21 AM  14 years ago
9387ASH

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UK

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Geegar, if the box they came in state 4.8V then use 4.8V. The US versions of the JR servos are manufactured on behalf of Horizon by JR and do not necessarily have the same votage specs.

If in doubt, have a look at the JR (Japan) website and see their list of servos and compare it against the Horizon list of "JR" servos. You will notice that there is a substantial difference !

If you want to use a 6V line then I would suggest you wire in a couple of diodes to drop the voltage down to a "safer" level for the 4.8V servos.
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09-07-2006 12:46 PM  14 years ago
perfesser zero

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Dublin, VA., USA

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Mac_Man...
I've heard of the diode step down voltage mod before, but I don't think I've seen which diode to use. Do we have a manufacturer and number to use?

Later...

Scott!
Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S
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09-07-2006 12:54 PM  14 years ago
mattie-lodge

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Southampton, UK

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Hi Mac man,

I'm using a fromeco reg and can set the volage between 4.8v and 6vdc. I was thinking round 5.4 vdc for the main servos with the gyro being fixed as 5vdc. As you know a fully charged nicd 4.8v pack will sit at 5.5v and then averge out at 5.2v.

What do you think

Cheers

Matt
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09-07-2006 03:11 PM  14 years ago
9387ASH

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UK

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Geegar,

I would go with that .... as you say, a fresh off-charge NiCd will give around 5.5 - 5.6V, so dropping it down to 5.4 / 5.2 should be acceptable.

The problem is that any binding whatsoever will cause excessive currents to flow and with anything electronic, there is a finite point when someting will release the "magic smoke". Obviously they could upgrade the internal components so that it would take the extra current, but this would increase the cost & size of the components involved. Also secondary damage could be done to the receiver as this current flow has to flow along this very thin narrow track on the Receivers pcb and again can quite easily be burnt out...

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09-07-2006 03:29 PM  14 years ago
JRMAN

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Macedon, New York

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Geegar, if the box they came in state 4.8V then use 4.8V. The US versions of the JR servos are manufactured on behalf of Horizon by JR and do not necessarily have the same votage specs.
Mac_Man is right. I wasn't considering the our geological difference.


John


The less time I have the more I get done.
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09-07-2006 04:49 PM  14 years ago
mattie-lodge

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Southampton, UK

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Thanks team
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09-07-2006 05:03 PM  14 years ago
AirWolfRC

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42½ N, 83½ W

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4.8V is the nominal from a 4 cell NiCd pack. Fresh off the charger, that pack can be as high as 6 volts and will settle to about 5.6 volts if left to sit for a while before using.

The servo and gyro manufacturers know this when they say the operating voltage is 4.8 volts. The only reason 4.8 volts is stated is because the servo/gyro is intended to be used on a 4 cell NiCd pack accounting for the variations from charging. This 4.8 number comes from the electromotive potential from the NiCd chemistry of 1.2 volts per cell times 4 cells for the pack.

Carbon-Zinc is 1.5 volts per cell.
Lead-Lead (car battery) is 2.0 volts per cell.
Hydrogen fuel cells are about 0.5 volts per cell.

When they spec. 6 volts, they are saying that the servo/gyro is good for use on a five cell NiCd pack.

Long story short . . . up to 5.6 volts is 100% acceptable for anything rated for a 4.8V system.

Just like your car which has a 12 volt battery in it.
It operates at 14 volts while running . . . always has . . . always will.

Wolfgang
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