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Old Jan 19, 2013, 08:46 PM View Post
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Old Jan 20, 2013, 12:29 AM
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SPAM ALERT!!
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Old Jan 20, 2013, 01:18 AM
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I thought you wrote about me
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Old Jan 20, 2013, 08:32 AM
Flying a Chipmunk in Portugal
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So Renato, are we getting hall effect gimbals on the frsky radios??
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Old Jan 20, 2013, 09:26 AM
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No, who said this ? I wrote about pots, not hall sensors !
Good quality pots from brand radios are cheaper than you expect... what do you think about less than $2 (at mouser, volume purchase) the sensors used in Futaba radios, sold as spare service parts for about $5 ?
These are not even pots, they are called angular position sensors (made by Murata), looks and behave externally as a pot - 10k, but internally are a bit more sophisticated, an resistive area made from plastic, not carbon as in regular pots, cursorless, so no wear, rated for 1 million cycles !
Sincerely... the magnetic sensors are that kind of bling to get people money, as Aluminium carved cases
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Old Jan 20, 2013, 09:30 AM
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Anyone pointing a real bad point will get a bonus
U11 doesnt look too good.
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Old Jan 20, 2013, 04:31 PM
The Big Kahuna of Foam.
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Originally Posted by renatoa View Post
Things derailed quite too much off-topic, so, if it is to rant, let at least rant on topic, for example, the new radio motherboard

Anyone pointing a real bad point will get a bonus
You could change the silk screen so that all the component identifiers could be read with without turning the board 180 degrees. Also there is some excess flux on some of the solder joints. Water based flux is easer to clean off and makes the board look nicer. All in all it is a nice looking board.
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Old Jan 20, 2013, 07:55 PM
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Originally Posted by renatoa View Post
No, who said this ? I wrote about pots, not hall sensors !
Good quality pots from brand radios are cheaper than you expect... what do you think about less than $2 (at mouser, volume purchase) the sensors used in Futaba radios, sold as spare service parts for about $5 ?
These are not even pots, they are called angular position sensors (made by Murata), looks and behave externally as a pot - 10k, but internally are a bit more sophisticated, an resistive area made from plastic, not carbon as in regular pots, cursorless, so no wear, rated for 1 million cycles !
Sincerely... the magnetic sensors are that kind of bling to get people money, as Aluminium carved cases
Hall sensors can't be that expensive because this uses a hall effect sensor and sells for $23.99. (this is actually a relabled Blue Arrow DMS-28013MG)

http://www.hobbyking.com/hobbyking/s...11sec_26g.html

Internally it has a sensor chip on a daughterboard and a plastic housing with a magnet on a shaft that slides over it. The magnet sits just above the chip and the servo knows the position of the output gear by sensing the direction the magnet is pointing.



Great servos btw, really smooth with good centering and almost nonexistent deadband. I'm using them on my Tarot 500 and I can crank the cyclic gains almost to maximum without causing cyclic wobble. Makes me wonder why Futaba and Hitec aren't doing this.

EDIT: Beenflying posted some information about these chips in the 450 thread a while back. He was the one that recommended these servos to me.

http://www.rcgroups.com/forums/showt...9#post23201004
http://www.rcgroups.com/forums/showp...postcount=7038
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Last edited by Atomic Skull; Jan 21, 2013 at 10:45 PM.
Old Jan 20, 2013, 09:28 PM
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Please correct me if I'm wrong -- but I have been told Hall effect sensors are temperature sensitive. If so, calibration would need to be done for differing temperatures.
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Old Jan 21, 2013, 12:49 AM
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Please correct me if I'm wrong -- but I have been told Hall effect sensors are temperature sensitive. If so, calibration would need to be done for differing temperatures.
depends on the choice of sensor IC's they make some for use in Diesel turbos now a days.
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Old Jan 21, 2013, 01:43 AM
You can't take the sky from me
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depends on the choice of sensor IC's they make some for use in Diesel turbos now a days.
I guess they would use those for tray transmitters.
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Old Jan 21, 2013, 02:02 AM
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Not good for people wearing magnetic bracelets for medical purpose
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Old Jan 21, 2013, 03:26 AM
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Originally Posted by Atomic Skull View Post
Great servo btw, really smooth with good centering and almost nonexistent deadband.
you are lucky because I have not heard the same from other helicopter pilots.
as far as I know there is no other international distributor besides HK, it remains a chinese servo for me.
I have the dealer price list of many chinese servos, I don't buy because I don't trust them too much.... only for foamies.
last week I got the price list of these new servos, they look not bad on the paper


Quote:
Originally Posted by Atomic Skull View Post
Makes me wonder why Futaba and Hitec aren't doing this.
JR uses this technology (hall effect sensors) in their high end servos and charges a premium for it, which is bull because these hall effect sensor chips were developed to provide a lower cost alternative to high quality pots in consumer electronics not because they're more accurate.(they aren't, just better price vs performance and they last longer)
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Old Jan 21, 2013, 06:21 AM
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Strange reasoning...
So for you KST are no more a "just chinese" only because it has an US seller? Even they are sold at HK too rebranded as Turnigy ?
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Old Jan 21, 2013, 06:38 AM
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Boy this threat is going all over the place lol, that's what happens when we are left to wonder when this controls ever gonna appear then?

re post above, brushless servos sound interesting, I have had servos burn out on me many times mostly in my gliders which get a lot of flying time and it's always been the motor followed by the transistors which I presume the brushes had worn out causing the problem, with metal gears would a brushless servo be pretty much bullet proof do you think, obviously as long as it's not driven beyond limits or stalled?

I would love to have some 5 to 9 gram ones, it would take away another weak point in our planes.
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Last edited by nigelsheffield; Jan 21, 2013 at 06:49 AM.
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