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Thread: Sander Style LC Filter - remove lines in your video

  1. #1
    Bazinga! Maximus's Avatar
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    Sander Style LC Filter - remove lines in your video

    This post was copied from Sander's original post on RCGroups so we don't have to keep linking to there. Some extra notes:
    - An LC filter removes horizontal lines in your video caused by noisy ESCs
    - If you're using an OSD, only wrap the positive wire through the ferrite ring
    - Get as many wraps as possible through the ring, it does have an effect on how well it works
    - I use 24AWG silicone wire from HobbyKing
    - 25V 1000uF works well for me

    Here's Sander:



    For the folks that missed the post in the other topic, here's a little pictorial on LC filtering. I always use a piece of servo wire and strip off the signal wire so I'm left with BLACK-RED. For constructing the inductor (the L in LC filtering) I loop both wires through a ferrite ring as many times as it'll fit, but at least >5 times. I use both wires as that gives a little better attenuation of the ESC noise as the inductor now becomes a common mode inductor.

    I then simply solder a 470...1000uF/25V electrolytic capacitor (the C in LC filtering) to the side that attaches to the audio/video transmitter and the camera. The capacitor is polarized, hence it has a + and - pole. The - pole is marked with a stripe and - symbols on one end, you can't miss it, that needs to go on the BLACK wire, the + pole is on the RED wire. This will clear up any ESC noise that normally causes lines in the video. The parts you'll need are:

    - Length of servowire
    - Ferrite ring
    - 470...1000uF 25 volt electrolytic capacitor


    Fig 1. Here's the parts you'll need, available from Radio Shack and similar stores.



    Fig 2. Here's the servo wire being looped through the ferrite ring.



    Fig 3. And that's the finished LC filter with the capacitor soldered on.



    All that is required now is some shrinkwrap to keep the inductor tightly wound and to go over the exposed electrical contacts. That's it, simple yet effective and all that from a mere few $$$ worth of electronic parts.

    Cheers,

    Sander.


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    Last edited by Maximus; 4th February 2014 at 04:44 AM.

  2. #2
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    small question!


    My camera and VTX are both powered directly from my battery. On this same batt is my esc which powers my FCB. Should i use this LC filter to filter the lines out of my video when i'm throttling up?


    greetsz

  3. #3
    Bazinga! Maximus's Avatar
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    That's correct, you use the LC filter to filter those lines out.
    I split extra power leads from somewhere between my current sensor and ESC, which will then go through the LC filter to the Vtx and cam.
    Last edited by Maximus; 4th February 2014 at 05:41 AM.

  4. #4
    Fretsaw Jedi Roboforcer X2000's Avatar
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    Making these for years, they work great! Here's a pic for reference from my Mini-H, made for filtering 5v

    If you're a noob, copy 1:1 what somebody already flies without too much questions, you'll find the answers later.
    PatrikE: I don't see anything wrong in your dump...
    Derrick:
    you are flying it LOS... You are doing it wrong.

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    wow robo, that looks slick! don't know if i can manage that

  6. #6
    Navigator hagay's Avatar
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    Thanks, short comparison video I made long ago
    You can see the difference is like night and day


  7. #7
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    wow, big difference! Time to do some shopping


    And whats the reason to only use to positive wire while using an OSD?
    Last edited by Michael van der Hoek; 4th February 2014 at 09:05 AM.

  8. #8
    Engineer for Jesus Christ IBCrazy's Avatar
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    Using a shottky barrier diode on the positive wire allows for significantly better performance and a smaller capacitor. Place it before the LC filter to better hold the voltage at a stable level.

    -Alex
    If it is broken, fix it. if it isn't broken, I'll soon fix that.

    videoaerialsystems.com - Performance video piloting

  9. #9
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    Can you explain yourself alex? Im going to get the stuff i need to make an lc filter. Can you make a list of the parts? And maybe a wiring diagram?

    Bought myself some bluebeam ultra's also!

    Greetsz

  10. #10
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    Just made my 2 lc filters all worked out well! Only have to test them!


    EDIT: I see i'd used a different capacitor, mine is 470 uF and on the pics its 1000uF.
    Is that bad?
    Last edited by Michael van der Hoek; 6th February 2014 at 04:24 AM.

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