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Running JR 8900 on A123 (2S /2300mAh)

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  • #1

    Running JR 8900 on A123 (2S /2300mAh)

    Hi

    I would like to power up my main RX (Spectrum 7200 BX flybarless) in my Trex 600 using A123 2S.
    Will the JR 8900G be okay running without any regulator
    Or do I have to use the Align Voltage dropper (6.1V) that was supplied with the kit.

    When I checked the Voltage reading from the RX via the voltage dropper I got 6.6 V and the actual Voltage from the battery is 6.93V.

    Is the JR servo safe to run on the above set up ?

    Thank you for your time..
    Keep Well
    Zaidy


    T Rex 700 LE FBL Spectrum 7200 Beast X
    T Rex 700 FB
    T Rex 600 NSP FBL     Spectrum 7200 Beast X
    DJI Quad, NAZA M V1
    DJI Hexa, NAZA M V2

    Rhyl and District Model Flying Club
    http://rdmfc.forumotion.co.uk
    Tags: None
  • #2
    Er nope, the JR servo will need a lower voltage I'm afraid. The Align dropper is very crude and not a regulator at all, you'd
    be better off using a propper true regulator with a 5volt output for the rudder such as the ElyQ. Alternatively use a different servo such as the Align DS650 which will run fine on 6volts without any regulation.
    Sean,

    Logo 700 Xxtreme
    SAB Gobbler 700
    SAB Gobby 500
    T-Rex 700, Now FuBarred (Lol)
    T-Rex 700E, 12s Fun
    T-Rex 250 FBL, Less parts to break,
    DJi 450 FPV Flamewheel

    1 Very understanding Wife

    Comment

    • #3
      Western Robotics Tail Servo Step-Down Voltage w/ LED WRL-STVRL

      if you have areg already plug this in tail servo
      Santander Factory Team

      Proud wearer of 5 x EGS

      Comment

      • #4
        Thanks for your prompt reply Sean.
        I was thinking of using a 5V UBec (5A) on the RX to to rudder output channel. Would that work ??

        Cheers
        Keep Well
        Zaidy


        T Rex 700 LE FBL Spectrum 7200 Beast X
        T Rex 700 FB
        T Rex 600 NSP FBL         Spectrum 7200 Beast X
        DJI Quad, NAZA M V1
        DJI Hexa, NAZA M V2

        Rhyl and District Model Flying Club
        http://rdmfc.forumotion.co.uk

        Comment

        • #5
          Originally posted by GIXERMAN View Post
          Western Robotics Tail Servo Step-Down Voltage w/ LED WRL-STVRL

          if you have areg already plug this in tail servo
          But my supply voltage is 6.9V ! I don't think that will drop enough !
          Keep Well
          Zaidy


          T Rex 700 LE FBL Spectrum 7200 Beast X
          T Rex 700 FB
          T Rex 600 NSP FBL           Spectrum 7200 Beast X
          DJI Quad, NAZA M V1
          DJI Hexa, NAZA M V2

          Rhyl and District Model Flying Club
          http://rdmfc.forumotion.co.uk

          Comment

          • #6
            Horses for courses as they say ...

            Personally I'd use LiFe when the servos can take the full voltage, if they can't then use Lipo and a regulator.

            I don't see the point in using LiFe and then sticking a regulator into the mix.

            Comment

            • #7
              Originally posted by HAWK 30 View Post
              Thanks for your prompt reply Sean.
              I was thinking of using a 5V UBec (5A) on the RX to to rudder output channel. Would that work ??

              Cheers
              It would work but as Mark has said you may be making things over complicated.

              KIS springs to mind, KEEP IT SiMPLE
              Sean,

              Logo 700 Xxtreme
              SAB Gobbler 700
              SAB Gobby 500
              T-Rex 700, Now FuBarred (Lol)
              T-Rex 700E, 12s Fun
              T-Rex 250 FBL, Less parts to break,
              DJi 450 FPV Flamewheel

              1 Very understanding Wife

              Comment

              • #8
                Funny you should ask this...

                On my E550 I also have the JR 8900 Tail Servo and I have just ordered my first LiFe battery (after lengthy discussions elsewhere on the forum)

                So i faced the same problem as you, that servo needs to be run at around 4.8V

                I ordered one of these, which will sit inline between the gyro and servo - same as the align one: Futaba PS-01 1.0A High Voltage Servo Step Down 7.4V Down To 5.0V PS01RS5
                Matt
                Goblin 500 Sport
                Owner of                 One E.G.S.

                Comment

                • #9
                  Originally posted by Young Gun View Post
                  Funny you should ask this...

                  On my E550 I also have the JR 8900 Tail Servo and I have just ordered my first LiFe battery (after lengthy discussions elsewhere on the forum)

                  So i faced the same problem as you, that servo needs to be run at around 4.8V


                  I ordered one of these, which will sit inline between the gyro and servo - same as the align one: Futaba PS-01 1.0A High Voltage Servo Step Down 7.4V Down To 5.0V PS01RS5
                  Fantastic, just the sort of thing I have been after. How about your cyclic servos are they HV or are you running them from a voltage reg.

                  Thank you
                  Keep Well
                  Zaidy


                  T Rex 700 LE FBL Spectrum 7200 Beast X
                  T Rex 700 FB
                  T Rex 600 NSP FBL                   Spectrum 7200 Beast X
                  DJI Quad, NAZA M V1
                  DJI Hexa, NAZA M V2

                  Rhyl and District Model Flying Club
                  http://rdmfc.forumotion.co.uk

                  Comment

                  • #10
                    I have been running this tail servo on 5.1V for a long time without any trouble I personally would not run it much higher than this, I think 6V would be too much...

                    The Spektrum or Futaba servo regulators are the ones you want.

                    What cyclic servos are you running? Most are normally just fine with LiFe packs.

                    Comment

                    • #11
                      Originally posted by LaurenceGough View Post
                      I have been running this tail servo on 5.1V for a long time without any trouble I personally would not run it much higher than this, I think 6V would be too much...

                      The Spektrum or Futaba servo regulators are the ones you want.

                      What cyclic servos are you running? Most are normally just fine with LiFe packs.
                      Running Align 620, I will have a look at the spectrum and Futaba servo regs.

                      Thanks
                      Keep Well
                      Zaidy


                      T Rex 700 LE FBL Spectrum 7200 Beast X
                      T Rex 700 FB
                      T Rex 600 NSP FBL                       Spectrum 7200 Beast X
                      DJI Quad, NAZA M V1
                      DJI Hexa, NAZA M V2

                      Rhyl and District Model Flying Club
                      http://rdmfc.forumotion.co.uk

                      Comment

                      • #12
                        Originally posted by HAWK 30 View Post
                        Fantastic, just the sort of thing I have been after. How about your cyclic servos are they HV or are you running them from a voltage reg.

                        Thank you
                        My Cyclic servos are just 4.8v to 6v servos - I will be running them directly from the LiFe battery - the idea was to remove the use of a BEC alltogether as a BEC can fail... whereas a direct battery connection is less likely to fail.

                        A LiFe battery runs at 6.6v after its initial fully charged burst of 7.2v... I think normal 6v servos will run fine.. but as said, 7.2v-6.6v is too much for that JR 8900 servo - I'm sure it'll burn out pretty quick without a decent step-down regulator..

                        What I like about that Futaba one is it can take any voltage a 2S LiFe battery can produce and output a steady 5V.. so ideal for that servo. A tad expensive I agree but that tail servo isnt cheap either so worth investing in
                        Matt
                        Goblin 500 Sport
                        Owner of                         One E.G.S.

                        Comment

                        • #13
                          Originally posted by Young Gun View Post
                          My Cyclic servos are just 4.8v to 6v servos - I will be running them directly from the LiFe battery - the idea was to remove the use of a BEC alltogether as a BEC can fail... whereas a direct battery connection is less likely to fail.

                          A LiFe battery runs at 6.6v after its initial fully charged burst of 7.2v... I think normal 6v servos will run fine.. but as said, 7.2v-6.6v is too much for that JR 8900 servo - I'm sure it'll burn out pretty quick without a decent step-down regulator..

                          What I like about that Futaba one is it can take any voltage a 2S LiFe battery can produce and output a steady 5V.. so ideal for that servo. A tad expensive I agree but that tail servo isnt cheap either so worth investing in
                          That is what I am trying to achieve, now I would like to get the Futaba PS-01 1.0A High Voltage Servo Step Down 7.4V Down To 5.0V PS01RS5 but they are not in stock at Revolution or fast lad. Will keep looking.

                          Thank you
                          Keep Well
                          Zaidy


                          T Rex 700 LE FBL Spectrum 7200 Beast X
                          T Rex 700 FB
                          T Rex 600 NSP FBL                           Spectrum 7200 Beast X
                          DJI Quad, NAZA M V1
                          DJI Hexa, NAZA M V2

                          Rhyl and District Model Flying Club
                          http://rdmfc.forumotion.co.uk

                          Comment

                          • #14
                            I'd try giving fastlad a ring - I ordered my futaba step down only a few days ago - so I must have had the last one maybe.. Give them a ring and see when they'll have more or when they could get you one.

                            Might be worth trying some of the other model shops.. midlands heli, SMC, etc
                            Matt
                            Goblin 500 Sport
                            Owner of                             One E.G.S.

                            Comment

                            • #15
                              There is also this Spektrum regulator: Spektrum VR5203 Dual Output Regulator SPMVR5203

                              But again out of stock unfortunately but they look to be in stock here:

                              Lowest prices for Spektrum VR5203 Dual Output Regulator : Brentford Radio Control Centre
                              Spektrum - VR5203 Duel Voltage Regulator - SPMVR5203 - ModelmaniacsOnline.Co.Uk


                              I just went ahead and ordered a HV tail servo...

                              Comment

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