How power a 12V servo?
03-13-2010, 05:57 PM
#1
How power a 12V servo?
There's a 12V servo that looks interesting, but my ESC's BEC only puts out about 6V. I have a couple of external UBECs that each put out 6V. Can I just tie the 2 UBECs in series, pull out the power and ground wires on the connector that goes to the servo (leave the signal wire connected to the ESC), and connect them to the power and ground wires of the UBECs?
03-13-2010, 06:13 PM
#2
Consider a small 3S Lipo as a receiver pack. Should give nearly 12v when fully charged. You only then need to run the signal line from the servo to the receiver (could use a servo extension wire and cut the red wire).
What's the servo?
BTW, just put in an old Ko-Propo 7.2v servo in my T4. Wow, it's fast - about .07s. It takes a wire from the main 2S LiPO (+) into the servo along with the normal 3-wire receiver plug. Things you find on eBay...
What's the servo?
BTW, just put in an old Ko-Propo 7.2v servo in my T4. Wow, it's fast - about .07s. It takes a wire from the main 2S LiPO (+) into the servo along with the normal 3-wire receiver plug. Things you find on eBay...
03-13-2010, 06:20 PM
#3
Ok, so it sounds like disconnecting the power lead at the least (and possibly the ground lead also) from the servo to connect it to an external power source is ok, leaving just the signal wire going to the receiver. Thanks.
The servo is a Turnigy titanium gear servo that's rated for nominal operation at 12V...but it's rated torque is insane!
The servo is a Turnigy titanium gear servo that's rated for nominal operation at 12V...but it's rated torque is insane!
03-13-2010, 07:03 PM
#5
You have to leave the ground wire or it will never work, just de-pin the red wire to the servo and tie in the extra power to the servo. The receiver needs the 6v from the esc to operate. and you cant put 12v to the receiver.
03-13-2010, 07:06 PM
#6
This one?
http://hobbyking.com/hobbyking/store..._.130sec_/_79g
Speed is just "ok" in terms of what the competition offers but the torque is very high.
Operating Speed (8.4V): 0.180 sec/60° degrees at no load
Operating Speed (12V): 0.130 sec/60° degrees at no load
Stall Torque (8.4V): 26.90 kg.cm (373.6 oz/in)
Stall Torque (12V): 38.40 kg.cm (533.3 oz/in)
That's more than enough torque for any 1/8 or 1/10 application. Maybe a steering servo for a 15lb monster truck or something like that.
The HV-767 which runs off normal voltags may be better as you can run it off the receiver.
http://hobbyking.com/hobbyking/store..._.130sec_/_79g
Speed is just "ok" in terms of what the competition offers but the torque is very high.
Operating Speed (8.4V): 0.180 sec/60° degrees at no load
Operating Speed (12V): 0.130 sec/60° degrees at no load
Stall Torque (8.4V): 26.90 kg.cm (373.6 oz/in)
Stall Torque (12V): 38.40 kg.cm (533.3 oz/in)
That's more than enough torque for any 1/8 or 1/10 application. Maybe a steering servo for a 15lb monster truck or something like that.
The HV-767 which runs off normal voltags may be better as you can run it off the receiver.
03-13-2010, 07:33 PM
#7
Yeah, that's the one. The speed should be fine for me. My current servos are much slower.
There's another one that runs off 6-7.4V I think. My ESC puts out 5.75V.
There's another one that runs off 6-7.4V I think. My ESC puts out 5.75V.
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