Hi Martin,
Thanks for asking! The ferrite rings didn’t seem to have much of an effect, I then disconnected one of the micro servos and that made it slightly better. I noticed (after I’d burnt it out with too high voltage batteries -11.1v lipos and the motor was an M500 7.2v) that the old motor didn’t have any suppression, so when I changed it to a 12v M600 I’ve added the suppression capacitors. I’ll keep you posted!

Hi Eric,

Did you manage to sort out the jittering servos problem ?

If so what was the solution.

Martin555.

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..

have a look at

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. 😂
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 iron😉, I can send you a circuit diagram for a tester based on the NE555 timer chip.
Cheers, Doug 😎

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 👍

Thanks Doug, could you send me a link to the servo tester? Here’s a pic of the details..

Thanks, that’s a good idea. I had two and they both misbehaved - so have ordered another one to test...

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 👍
Gonna have a go at that, might also be possible to modify to work as a rowing machine!😉

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 😎

Hi,
I know that you have tried a larger servo but have you tried another small servo?

Martin.