I'm going to use a slip ring connector (such as this one) to power 6 servos on the other end of a rotary. This slip ring is rated for 2A of current per wire/ring.

If the 6 servos share a common +6v and ground, they will easily exceed 2A current draw. My naive understanding of conductance tells me that if I use two of the wires for +6v instead of one (and two for ground), I can effectively double the amount of current available to the servos because the first wire/ring (the one with initial least resistance) will heat up as it approaches the maximum rated current, becoming more resistant than the alternate wire/ring.

Am I wrong to assume that this setup would allow me to provide more than 2A through the slip ring?

  • \$\begingroup\$ I read the specifications sheet as 2 amps per ring, not per wire. \$\endgroup\$
    – Marla
    Commented Jan 12, 2016 at 19:43
  • \$\begingroup\$ @Marla I think one wire is connected to one ring. \$\endgroup\$
    – Eugene Sh.
    Commented Jan 12, 2016 at 19:44
  • \$\begingroup\$ I stand corrected. I just looked further, to page 23 of spec sheet, where it shows number of rings and number of wires. Spot on @EugeneSh. \$\endgroup\$
    – Marla
    Commented Jan 12, 2016 at 19:45
  • 2
    \$\begingroup\$ Anyway, you can do it and your understanding is right. But bear in mind it will produce a ground loop and also if one ring is breaking, the other one will likely burn as well. \$\endgroup\$
    – Eugene Sh.
    Commented Jan 12, 2016 at 19:51

1 Answer 1


Since you're looking at 6 servos, with one control line per servo, I'd recommend splitting up your servos into pairs, each pair using one power and one ground line. This will total 12 wires, a perfect match for your connector.

  • \$\begingroup\$ I appreciate the recommendation, but the hope is to use the other wires for an IMU - this is why I am trying to share all the +/- connections from servos to the power source. \$\endgroup\$ Commented Jan 12, 2016 at 20:18
  • \$\begingroup\$ @BlakeRegalia - Keep in mind that if you double up on the +6 line, you'll need to double up also on the ground wires, which only leaves 2 spare wires. \$\endgroup\$ Commented Jan 12, 2016 at 20:23
  • \$\begingroup\$ Rethinking your suggestion, I do realize now why it would make more sense to cluster servo power onto the separate lines. Instead of doing pairs, I can connect two groups of three servos to each +/-, using 4 wires for power, 6 wires for control, and sparing 2 for the IMU. \$\endgroup\$ Commented Jan 12, 2016 at 20:27

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.