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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › KO Propo PDS 2123 Servo
07-19-2006 01:10 PM  14 years ago
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TomR

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Norway

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KO Propo PDS 2123 Servo
Hi,

I am thinking about putting KO Propo PDS 2123 FET Servo on pitch in my two Raptor 90s. And was wondering, how do i get 7,2volt to only this servo? On the first heli i am now running a Nicd 2400mah 4.8v bat pack, i got JR8401 servos and GY601. And the other one I would like to run Fromeco Arizona regulator w/4800mah li-ion, with futaba 9255 servos, and a Gy601.

What is the best thing to do if i want to run KO Propo PDS 2123 FET Servos on my 90s.?


Cheers.
Thunder Tiger, Curtis Youngblood, Scorpion, Rapicon, Hyperion
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07-19-2006 02:19 PM  14 years ago
RotorHead486

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England

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Hey Tom,

What you have to do is run the whole system on a 7.4V System. The best ones at the moment are the Duralite System or the Fromeco System or you can use a Lithium Polymer batter designed for Rx use, these can be found at Flightpower.co.uk.

I suppose you could make up a 7.4V system without using Lithium cells but i would say the weight disadvantage would be huge.

What you get with the KO Propo servo is 4 wire servo lead, 3 wires like a normal servo and then an extra wire that supplies the power to the servo. What you have to do is 'splice' the signle power wire into the wire that comes directly from the 7.4V battery before it goes to a regulator. What you end up with is the KO Propo pitch servo running on 7.2/7.4V and the rest of the system running on 5.1/5.3/5.9V depending on what regulator you pick.

Hope this helps!
RH486
One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team
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07-19-2006 02:28 PM  14 years ago
Yug

rrMaster

UK. Herts

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I'm dunning my R90SE of Duralite 4000mAh battery and 5.3v regulator. The duralite regulator supplies everything except the 2123. The blue wire connects directly to the battery connecter.Vegetable rights and Peace
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07-19-2006 03:06 PM  14 years ago
ADRYAN

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Stouffville, Ontario, Canada

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This is how I've got my 2123s setup...



A


.
DYNAX/OS91 : 9303/S649pcm : GY601/9251 : CSMRL10/9253 : 7.4vLipo/Regulator : KO2123s(ai/el/pi)
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07-19-2006 03:12 PM  14 years ago
AirWolfRC

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42½ N, 83½ W

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Yup, that'll do nicely. And a common ground for everything.

But keep in mind that the only thing you really gain is less current in the power wires by about 1/3. Other than that, the servo specs. will tell you how much torque you can expect.

Wolfgang
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07-19-2006 04:23 PM  14 years ago
Futurac

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Belgium , Europe

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ko
Another possibility is to use one pack of 6 cells Nicd/nimh
then you take out the output of 4.8-5v to RX and the output of 7.2v to the KO blue wires.

in general, it is an excellent choice to use KO 2123
Alex (Formerly Known as RCMarket )
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07-19-2006 04:37 PM  14 years ago
AirWolfRC

rrProfessor

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Not a good idea to tap the battery at 4 cells for the RX & gyro.
You end up with an unballanced pack.
Stick with the regulator.

Wolfgang
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