seperate servo power

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
cordy

cordy

Well-Known Member
Messages
2,387
Reaction score
0
Location
suburbs of chicago
Any you guys running seperate power for a hs 7950 high tork servo? Do you use a y harness and if so do you just plug one side into the reciever and the other side to a 7.2 volt lipo, or will that smoke the reciever?
 
Which receiver are you using? Many receivers run on 6v, so using a y-harness to a 7.2v source will provide too high a voltage. You can remove the common POS wire going to the rx so that the servo will be powered by 7.2v, but not the receiver.


Lipo use...do you have a low-voltage cutoff for it, as this would be important?
 
Thanks for the reply. I am using a fly sky reciever,it works on 4.8- 6.5 . So if I used a lipo I would have to use a bec or a voltage regulator to drop the voltage down.
 
I tried this with a Y harness on one and Two 805MGs I did not really see a difference. I ordered this: http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.2874/.f @ DDM and I have not had a chance to hook it up yet. I have since switched to Fly Sky TX RX in my 5th scale vehicles. After seeing your post Cordy I am thinking this wont make a difference. If the receiver will do 6V the servo should draw that right?
 
The servo (7980) has the most torque at 7.4 volts (611oz.) at 6volts it has (500) oz. You could run one servo the 7980 at 6volts and just plug it into your reciever it would work fine I believe.The reason I started this is because the hs 7980 &7990 wont work on 4.8 volts. They only work on 6.0 or 7.4 volts. That being said one servo at 500 oz should be sufficent. God I hate being dumb!
 
cordy said:
The servo (7980) has the most torque at 7.4 volts (611oz.) at 6volts it has (500) oz. You could run one servo the 7980 at 6volts and just plug it into your reciever it would work fine I believe.The reason I started this is because the hs 7980 &7990 wont work on 4.8 volts. They only work on 6.0 or 7.4 volts. That being said one servo at 500 oz should be sufficent. God I hate being dumb!
Click to expand...
If you were to run a 5-cell NiMH, the servo would operate off the rx. Using the y-harness mjp777 suggested (or similar) will allow the servo to draw a higher current under load, with less risk of damaging the rx.


To get even better performance, use can run a separate 6-cell NiMH or 2-cell LiPo to power just the higher voltage servos. Otherwise, you could run a single 6-cell NiMH or 2-cell LiPo battery, and then plug the servos direct to power, and have a regulator drop the voltage to the rx.
 
Back
Top