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    Servo jitters
    by EricMB πŸ‡¬πŸ‡§ ( Petty Officer 1st Class)
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    10 Posts 9 Replies 3 Photos 4 Likes
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    EricMB
    Petty Officer 1st Class
    πŸ“ Servo jitters
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 20 days ago
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    Thanks Jacko, will give the ferrite ring a go if the new servo misbehaves too - it arrived today but not had the time to test it yet! Interesting to see if it fixes the problem when there’s only one servo plugged in (unlike the video) and ITS the one doing the jittering!
    Thanks again..
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    jacko
    Chief Petty Officer 2nd Class
    πŸ“ Servo jitters
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    have a look at
    https://www.youtube.com/watch?v=sEp4VT6NL6o&feature=youtu.be
    https://www.youtube.com/watch?v=sEp4VT6NL6o&feature=youtu.be
    πŸ”—
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    1
    RNinMunich
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    πŸ“ Servo jitters
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    Country: πŸ‡©πŸ‡ͺ Germany
    Online: 13 hours ago
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    Sorry Eric but the pic didn't upload!
    Seems to be a snag on the site at the moment☹️
    Re Servo Tester,
    Mine is a Robbe unit which as been working great for years.
    Unfortunately Robbe is defunct. πŸ˜‚
    But if you Google RC servo tester you should get many options.
    There are also kits on the market to build your own.
    If all else fails, and you can use a soldering ironπŸ˜‰, I can send you a circuit diagram for a tester based on the NE555 timer chip.
    Cheers, Doug 😎
    Young at heart - slightly older in other places πŸ˜‰ Cheers Doug
    EricMB
    Petty Officer 1st Class
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    Ah glad you found Bob the Duck! He’s still going... will try more distance between the TX and the RX, although oddly the larger one worked fine in close proximity, I also remembered that the two servos worked fine with the same radio in another boat! Maybe the ferrite ring is the answer πŸ‘
    1
    EricMB
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    Thanks Doug, could you send me a link to the servo tester? Here’s a pic of the details..
    EricMB
    Petty Officer 1st Class
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    Thanks, that’s a good idea. I had two and they both misbehaved - so have ordered another one to test...
    RNinMunich
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    πŸ“ Servo jitters
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    Country: πŸ‡©πŸ‡ͺ Germany
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    Another thought Eric,
    It could be that your mini servos are more susceptible to interference - especially as you are operating the TX very close to the RX!
    First move the TX away at least 10 feet or more and try again.
    If it still jitters try fitting a ferrite ring to the servo lead, wrap the lead at least 3 times through the ring.
    Cheers, Doug 😎
    PS found your 'Bob the Duck' article in one of my Model Boats back numbers πŸ‘
    Gonna have a go at that, might also be possible to modify to work as a rowing machine!πŸ˜‰
    Young at heart - slightly older in other places πŸ˜‰ Cheers Doug
    RNinMunich
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    Country: πŸ‡©πŸ‡ͺ Germany
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    Hi Eric,
    could it be the wrong servo type?
    Analogue/Digital? HRS/Normal? 1500/1520uSec?

    Could also be that the larger ones have the motor suppressed and the littl'ns not.
    Can you post the make and model number of both types please.
    Can recommend one of the little Servo Testers! See attached pic of mine in action while testing Colin's modified Taycol Supermarine.
    Cheers, Doug 😎
    1
    Young at heart - slightly older in other places πŸ˜‰ Cheers Doug
    Martin555
    Sub-Lieutenant
    πŸ“ Servo jitters
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi,
    I know that you have tried a larger servo but have you tried another small servo?

    Martin.
    If it looks right it probably is.
    EricMB
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    Evening all, electronic help needed please. I'm building an LCT and working on the sea doors - I've used two micro servos to operate them. However, when the servos are plugged into the RX, they just jitter (see video). In order to check the RX/TX setup, I tried a larger servo - this worked fine! Is the micro servo U/S, or am I missing something? Flysky TX/RX setup, voltage fine on both, no other servos plugged in, RX correctly bound.
    27 May 2019
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