Has somebody tried these little guys on an ESC without BEC directly on a 2S Lipo, with a couple of diodes in between to reduce the voltage? Accordingly to the specs the max. operating voltage is 5V, but what can they handle in reality?
If, by regular RX you mean a standard Rx like the one that came bundled with your Tx, then you won't be able to plug these into the Rx. The have micro Molex (JST) connectors that are unique to micro receivers (i.e. OrangeRx R415). They also have a 5V max voltage limit which means you have to be careful about the Rx power source. Cheers!
This servo comes with micro plugs (1.25 mm pitch) that do not plug in standard RX systems (that I believe have 2.5 mm pitch). But you can salvage PC internal speaker plugs that fit in standard RX systems (provided you shave then down to only 3 contacts).
Hi there. I get a specific question. I am doing a project using extremely small servo motor, just like HK-282 Ultra-Micro Servo . Previously we were using BMS-303JST. However the only problem is that it can only rotate for 90 degree each pulse while we need it for 180 degrees and the supplier has respond me that they need to modify the signal to achieve. So se decide to choice another type of motor. Can HK-282 Ultra-Micro Servo achieve 180 degree ratation? If not please tell me any servo motor in your list 'Sub-Micro Servo 0-5g' which can achieve this. Many thanks!!
Do a little google search for modify standard servo to do 180 degree. Althought the HKM-282 is very small the mopds can be applied here too, taking care to use 1/8 W or SMD resistors and a very fine tip soldering iron.
I you are worried, install a diode with .6 voltage drop onto the red wire of the servo with the anode toward the reciever. Those will effectively lower the 5 volts by whatever the voltage drop of the diode is. This is what I will be doing once mine arrive.
If your ESC has BEC it will be 5V or 4.8V. This servo will work at these voltages but might be a bit jittery. The diode trick is fine. You might like to do it on the BEC side (connect the diod on the of your BEC) so that all servos and RX benefit from the one diode.
I need to be able to use 2s batteries with these type of servos... Shouldn't my Rx limit the out put of the power to the servos though??? I am so confused. I have both the nano orange Rx from here, and the nanolite Rx from $pektrum They use the little JST plugs. I need to be able to use servos with them, and a 2s battery. What servos will work??
You don't give any info on what you're using these on, but if there is an ESC involved it should limit the output voltage to your RX to 5V. If it's an integrated RX/ESC just be sure it's rated for 2S batts, as some aren't.
If your esc provides 5 volts from the bec and you still want to lower the voltage a bit, install a diode on the red (positive) wire of the servo with the anode of the diode torwards the reciever. Make sure the diode has a voltage drop of .6 volts.
FYI .... This version(HK-282)of servo is designed for 3.5 to 4.5 volt operation. The other version (HK-282A)is designed for 4.5 to 6.0 volts. The low voltage version was added for compatibility with micro aircraft using a single LiPo cell. For more specs and OEM info see HK-282A discussion also.
i've converted 3 of these with JR connectors - straight conversion. just watch your esc voltage is no greater than 5v - they sometimes jitter a little bit, i think it's quality control of the feedback pot.
there's crimp-able JR connectors sold on here that come in a 10 pack (10 male, 10 female). This is what i used. The wire from the servo lead is TINY... only a few fractions of a mm wide, i have had to resolder these a couple times after rough 'landings' but i don't solder then (and wouldn't reccomend doing so) when connecting to the JR leads. Instead i take the terminated end out of the white connector (mini jst?) and just crimp the terminated ends straight into the JR connector with a pair of needle nose pliers - just crimp it all in there!
the alternative is just too fiddly to consider - unless you have a fully equiped smd solderstation? :P
Hi, i'd like to put these small servos to my plane (they will control some switches to release load, bombs etc.) but i've got regluar reciever with regular futaba plugs. These seems to be JST micro plugs. Do you know how to join it together? Some converting cables? I tried to find them here, but still haven't found anything. THX a lot
Just a thought... I am pondering about getting these for guillows conversions, but I run on 2 cells for those planes.. Wouldn't it be possible to hook up a diode on these, to take the edge off the power coming from the receiver? Just like you do when running the AR6400 on a 2-cell pack? Only you'd need to have a diode on each servo in this case.. Any thoughts?
Hi Ballemann, your theory would work though I have a suggestion* since you need to modify each servo anyway - you can just split off and combine each of the ve and -ve of the servos in parallel then put a diode(you will most likely need more than one) in series at the end. To clarify all the servos ve and -ve leads go to one plug with the modified diode and the signals pin of each servo are independently plugged in as normal. Good luck.
Positive and negative VE are the powerleads to the servo, typically red and black or red and brown. If you connect a few diodes in series with the red lead from the receiver, the voltage will drop 0,6 to 0,7 volts per diode. This way you can drop the voltage to a desired level for 1S servos.
In my case I need to do this because I want these lightweight servos for a 2S-240mAh or 350mAh setup.
Derku: As for solving this with a 'parallel power-bus', thats a great idea for certain airframe layouts. May even save some weight when eliminating some of the wiring!
Or you could also use a 1Watt Zener Diode with a Breakdown Voltage of 3.6V and hook it up in reverse. The 2S should go from 8.4V to 4.8V and you will save more weight using just one diode. But this only works for low amp servos up to 1Watt such as these. Anything larger you will need more Watt Rating.
Diode, zener, wires, soldering... that looks weird to me. I would simply disconnect the ESC/BEC "red/ " wire on the receiver and use a dedicated 1S battery for receiver and servos (like sku 7566, 7567 or 8864).
Yes you could do that, but then again you could go with a slightly heavier, 2cell compatible servo instead, because the advantage you have by using these sub-3 gram ones would be lost again by adding an extra cell to power them.
I measured a walkera servo from my 4#3B. The A,C and D dimensions match. B on walkera is 19mm, this servo is 16mm - so they will easily fit. Also the plug looks like the same molex type.
Hence walkera "compatible", not walkeras...
Hello Pavcon. Yes I've seen your other numerous posts here. I'd be inclined to wait and see if a 5V version will come out, as soldering such small diodes would be tricky as I don't have an ultra fine soldering iron.
Clearly the plugs on these servos are something inbetween the two standards.. (Oh, and sorry about the shoddy quality of the picture, I have had WAY better mobile cams than my current one, the HTC desire..)
Anybody knows if this servo is full compatible with Walkera recivers, like RX-2433V, flybarles RX of "120D01" 4Ch. heli..?
1 thumbs up!
Well, here we go with some hard data: I finally got around to crimping a nano-JST (AR6400) plug onto one of the servos.. I then taped the servo to my desk and foamtaped a carbonrod to the servohorn, to help detecting jitter, resolution and centering clearly. *After 25plus sweeps one way and then 25plus the other way, centering is within 1,5mm of the reference pen-mark. *There was some microscopic jitter, but not much. And keep in mind that this
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1 thumbs up!
Ordered 4, average at 2.5g each with the dual servo arm installed.
The plug style fits the spektrum brick but not the AR6300 type(micro JST?).
On single cell it runs smooth, fast and crisp - sorry I have no means to measure quantitatively - however on 5v the movement jitters and doesnt feel like it has any performance increase.
And of course the price! so 5 stars.
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I have not been able to test mine yet as the plugs are NOT AR6300- OR AR6400 compatible. The pin spacing is similar to the 6400-plugs, but the plastic casing is bigger. Personally I always have a few of both the 6300 and the 6400 plugs handy, but if You don't, get some!
But what i can tell you so far is that they weigh in at close to 2,7g (average on the four I got) with the double arm and screw.
very good servos to use with my mini warbirds as ailerons..
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Well, they turned out nicer than I anticipated. Seem smooth, quiet and as fast as I would expect for this size. Very small dead band and no jitter. As pointed out (by people who have actually tried them!) these do NOT fit either the AR6300 or AR 6400 but are a different size plug. It is easy to move the connectors into an AR6300 plug shell if you push hard to make sure the nylon lug catches - however the pins are too large for an AR6400 shell. You have to completely replace the connector