Reverse servo polarity?

[hibbs]

Hey all

Trying to wire up a trx6 to my 4 channel futaba setup. I need to merge the front and rear diff servos into 1 channel. I know I’ll lose the ability to operate them separately for now but I’m ok with it for the time being.

If they work the same (both lock/unlock) then I am good. If not I’ll need to reverse one. Can I swap the positive and negative wires in the plug? That’s how you reverse a motor usually but idk if there is circuitry inside these micro servos that I’ll short if I do that... or if anyone knows a better way I’m all ears.

TIA

[Voodoobrew]

You would reverse them in your radio, not the car.

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[hibbs]

Originally Posted by Voodoobrew

You would reverse them in your radio, not the car.

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I have 2 different servos operating on 1 channel. If I reverse the channel they will still operate opposite of one another. As I have them run into a Y connector, when I operate the servos, one engages and one disengages. I need them to both engage and both disengage. Essentially, one servo needs to operate opposite from how it is now.

If there isn't a straight-forward means of doing it electronically, I can physically flip the servo around backwards. Though that will mean starting over with setting the linkage to move the cable in and out. I was hoping to avoid that.

[Voodoobrew]

Originally Posted by hibbs

I have 2 different servos operating on 1 channel. If I reverse the channel they will still operate opposite of one another. As I have them run into a Y connector, when I operate the servos, one engages and one disengages. I need them to both engage and both disengage. Essentially, one servo needs to operate opposite from how it is now.



If there isn't a straight-forward means of doing it electronically, I can physically flip the servo around backwards. Though that will mean starting over with setting the linkage to move the cable in and out. I was hoping to avoid that.

There is a motor inside the servo, you can reverse those wires possibly. But not the red and black outside the case.

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[hibbs]

Originally Posted by Voodoobrew

There is a motor inside the servo, you can reverse those wires possibly. But not the red and black outside the case.

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Yeah I kinda figured. Thank you for your help! Guess it’s time time to get a 7px or a hacked fly sky. Any advice on where to find a fly sky?

[Xx Losungen xX]

Could buy a server signal reverser, they're $5 on Amazon

[hibbs]

Originally Posted by Xx Losungen xX

Could buy a server signal reverser, they're $5 on Amazon

I didn’t know these were even a thing. Thank you! I will have to give this a try.

[robert@castle]

https://www.amazon.com/Turnigy-Rever.../dp/B01GN0GAUY
+
https://www.amazon.com/PACK-150mm-Sp.../dp/B01M04PMOL

[hibbs]

Originally Posted by robert@castle

https://www.amazon.com/Turnigy-Rever.../dp/B01GN0GAUY
+
https://www.amazon.com/PACK-150mm-Sp.../dp/B01M04PMOL

Thank you so much. I got a signal reverser so that will hopefully do the trick. I didn’t even know there was such a thing. I was planning on getting me a 7px radio for Christmas but they’re sold out. Harleys YouTube said they’re planning a new model. I’m thinking they pulled the stock for the new model but idk. Guess I’ll wait and see...

[heyok]

Originally Posted by Voodoobrew

There is a motor inside the servo, you can reverse those wires possibly. But not the red and black outside the case.

Sent from my SM-N950U using Tapatalk

I read that the OP will get a servo reverser circuit, but I just wanted to add to this post because it won't quite work.

Reversing the two motor wires will get you halfway there. You also need to swap the two outside wires on the position sensor pot inside the servo. If you forget to do that, the servo will just try and go full power in one direction until something either snaps or burns out.

[Xx Losungen xX]

It works fine for me and countless others. It doesn't reverse the two wires, it reverses the signal itself, the servo won't see any difference whatsoever.

Think of it like a pwm dip turning into a peak at the circuit on the signal wire, and in tune, a peak becoming a dip. It's not simply a harness that changes polarity of the DC input. It flips the signal sent from the receiver to the servo.

[heyok]

Originally Posted by Xx Losungen xX

It works fine for me and countless others. It doesn't reverse the two wires, it reverses the signal itself, the servo won't see any difference whatsoever.

I'm not sure you read my entire post I was quoting something from earlier in the thread.

I wasn't saying the servo reverser circuit wouldn't work. I was saying that swapping the motor connection wires won't work unless you take an additional step.

[Xx Losungen xX]

Originally Posted by heyok

I read that the OP will get a servo reverser circuit, but I just wanted to add to this post because it won't quite work.

Not here to argue but, that's literally exactly what you said.

I was just clarifying that a servo reverser circuit will indeed work, as you seem to agree with in your latest reply.

Life is good mate

[heyok]

Originally Posted by Xx Losungen xX

Not here to argue but, that's literally exactly what you said.

I was just clarifying that a servo reverser circuit will indeed work, as you seem to agree with in your latest reply.

Life is good mate

Thank you! You are completely correct. I posted before I read what I wrote!
Sorry - it made sense in my head. My mistake.

[Xx Losungen xX]

Originally Posted by heyok

Thank you! You are completely correct. I posted before I read what I wrote!

Sorry - it made sense in my head. My mistake.

All good man, I know you know what you are talking about. Didn't mean for my reply to come across as attitude or a chance to correct a smart mofo if it did.

Was in the spirit of not dissuading the op or anyone else to come across this post from trying one out.

[Greatscott]

A Traxxas T-Loc is what you want for this application, it is specifically made to do what you are trying to do.

[Xx Losungen xX]

Originally Posted by Greatscott

A Traxxas T-Loc is what you want for this application, it is specifically made to do what you are trying to do.

Not quite.

A T-Loc will give you the ability to switch between:

- Front Locked
- Rear Locked
- Both opened

The OP would still need a servo reverser though.

Adding the T- Loc on top of the servo signal reverser would give him the above features but I do believe it eliminates the ability to have both differentials locked at the same time (I could be wrong on that one).

[Voodoobrew]

Originally Posted by heyok

I read that the OP will get a servo reverser circuit, but I just wanted to add to this post because it won't quite work.



Reversing the two motor wires will get you halfway there. You also need to swap the two outside wires on the position sensor pot inside the servo. If you forget to do that, the servo will just try and go full power in one direction until something either snaps or burns out.

Yea it's obviously not as good as a servo reverser, I am in the group that has never heard of them. I just knew switching the outside red and black wouldent work. You need to reverse the white signal wire with itself. Now that you mention the position sensor it sounds pretty important, so yea don't follow me everywhere, I make guesses from time to time.

I smell what yer cookin.

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[hibbs]

Well this turned into quite an enlightening discussion. I love forums for this! Just to update, I got the reverser and it works wonderfully. It’s now either all locked or all unlocked by a Futaba 4PL. I didn’t try to cram all the mess and the Y connector I made in the Traxxas receiver box. I don’t think it’d fit.

[Xx Losungen xX]

You could take it a step further if your soldering skills are half decent.

If your reverser is shrink-wrapped you could carefully cut that off and add a short pigtail to the input side, parallel with the existing pigtail.

If you do that, you won't need the spaghetti mess of the Y harness.

- Plug the original connector of the reverser into your receiver.

- Plug one servo into the new pigtail you added to the input side of your reverser

- Plug the other servo into the output side of your reverser

Might all fit inside the box now.

Electrically it'll all be the same as using the Y connector, just a little tidier.