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07-27-2005, 04:24 PM
| #21 | ||
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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07-27-2005, 05:01 PM
| #22 |
| Newbie Join Date: Jul 2005 Location: Richardson
Posts: 18
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I agree with chafey. Running servos beyond 6V isn't unheard of. I run my 1/8 scale servos off a 7.2V lipo, without a hitch. Futaba 9351 and 9451. They are super quick monsters at that voltage.
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07-27-2005, 07:02 PM
| #23 |
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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Well u can go ahead and fry your servos... thoes servos you have MKX10 are rated for a max of 6 volts. I kno i want to keep my servos running and not fried!! |
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07-27-2005, 08:24 PM
| #24 |
| Quarry Creeper Join Date: Nov 2004 Location: MANVILLE
Posts: 413
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this should be stickied or placed in the tech section.good info
Last edited by SPEED_RACER; 08-03-2005 at 08:50 AM. |
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07-27-2005, 08:24 PM
| #25 |
| 06 Super National Champ   Join Date: Jun 2004 Location: Stark Industries Bar and Grill
Posts: 11,361
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In theory a simple voltage regulator would consist of a Zener diode and a current limiting resistor. Since a Zener is made to work in reverse bias it'll have a constant voltage drop. If you get a Zener with a breakdown voltage of 6v, put that in parallel with the power line on your servos, well...in theory I'd think it'd work. |
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07-27-2005, 10:00 PM
| #26 | |
| Newbie Join Date: Jul 2005 Location: Richardson
Posts: 18
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If you don't trust that, then here's another option http://www.koolflightsystems.com/ultimatebec.htm Last edited by MKX10; 07-27-2005 at 10:13 PM. | |
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07-27-2005, 10:12 PM
| #27 | |||
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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 soo you are saying i can run my computer that runs at 110 volts at 152 volts??? thats a little much! if servos have a MAX voltage rating for a reason...
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07-27-2005, 10:18 PM
| #28 | |
| Newbie Join Date: Jul 2005 Location: Richardson
Posts: 18
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For someone who's never tried pushing the limits a little, you act like you know a lot about it | |
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07-27-2005, 10:22 PM
| #29 |
| Newbie Join Date: Jul 2005 Location: Richardson
Posts: 18
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Here's another article and the address: http://www.lynxmotion.com/ViewPage.a...22#servo-power Author: Jim Frye Have you ever wondered what the limits are to servo power? Well, I have been doing some research in this area and have found some interesting facts. The servo is rated for 4.8 to 6 volts. This is representational of 4 AA NiCad batteries for 4.8 volts, or 4 AA Alkaline batteries for 6 volts. However the servo is an analog device, which means there is a certain amount of tolerance inherent to the design. A rep from Hitec has assured me that the electronics don't smoke until about 12 volts is applied. I have also found that it is considered very common for some remote control race car folks to power the servo directly from the 7.2 volt sub-C battery pack used by the drive motor. Also, the servo is quite a bit faster, which can result in more torque when moving an item with more mass. If anyone has any useful information on measuring rotational torque using a simple cheap fixture I would love to hear from you. Below is a list of servo supply voltages and the estimated torque values extrapolated from the 4.8 vdc and 6.0 vdc specs provided from Hitec. Of course, these are just estimates based on limited technical specs from Hitec, your mileage may vary... Ratings for a Hitec HS-422 Standard Servo -20% of rated voltage Rated voltage +20% of rated voltage +50% of rated voltage 4.8 vdc = 46 oz/in 6.0 vdc = 57 oz/in 7.2 vdc = 68 oz/in 9.0 vdc = 86 oz/in The really great part to using the 7.2 volt packs are their availability. Lynxmotion has 7.2 volt NiCad or NiMh packs for $20.00, we also carry battery chargers as well. You can even get the quick disconnect plugs to wire onto your robot. Disclaimer Use this information at your own risk! I have several robots using the 7.2 volt battery packs, including a Hexapod II with 12 Futaba 9202's. It is strong enough to do a one handed pushup, with no hesitation. I trust the electronics enough to risk $720.00 worth of servos. But don't even complain to me if you blow something up.  |
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07-27-2005, 10:30 PM
| #30 |
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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ok well most people dont like to do that i no im NEVER going to hook my servos straight to the battery!!... I will get the pics back up tommorrow! sorry for the inconvinence!(sp?)
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07-28-2005, 01:44 AM
| #31 |
| Quarry Creeper Join Date: Oct 2004 Location: Hopkinsville
Posts: 493
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I've been running fully charged gp3300 and gp3700 packs with my 2 hobbco cs80 giants for several months now. Hardcore crawlin'. Plenty of load to the servos. The setup has performed flawlessly, nothing's ever gotten even warm. The only problem I've had is having to buy aluminum steering knuckles.. Couldn't keep a plastic one together. Heavy |
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07-28-2005, 05:40 AM
| #32 |
| Quarry Creeper Join Date: Jun 2005 Location: Maryland
Posts: 319
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Well I will be the guy to say things could happen.  Since it did. I went straight power after hearing good things on here. Well I wont be anymore. My front servo woud get hot. 2400nimh pack. Thought nothing of it, but like I said one of the resistors inside actually unsoldered itself from the board. Fluke thing??? who knows. Thats alot of heat. Maybe a manufacturer mistake. Dont know. Instead of making a few of these I went ahead and got one of these with another servo. http://www.teamnovak.com/buy/ind_buypgs/5460.html 20 bucks and it is good for 6v/3amp just like super rooster is. Since my esc can power 1 servo fine. This should do the trick. and I like it since it has a built in switch and is still Novak quality. We shall see. nd4spdbh I am runnico Hobbico cs80's |
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07-28-2005, 09:41 AM
| #33 |
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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Ohh that regulator is cool! oooo i think i found a goood voltage regulator... 10 amp current and very low dropout.  Last edited by nd4spdbh; 07-28-2005 at 10:03 AM. |
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07-28-2005, 10:27 AM
| #34 |
| Quarry Creeper Join Date: Jun 2005 Location: Maryland
Posts: 319
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Little more info on Novaks since Tower is back up. http://www2.towerhobbies.com/cgi-bin...?&I=LXJJF6&P=7 |
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07-28-2005, 11:09 AM
| #35 |
| Rock Crawler Join Date: Aug 2004 Location: woods cross utah
Posts: 523
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wtf is the answer to someones question....tard. you cant use the novak one either,didnt you see the 6.3v on it thats more than six volts and it will melt your servos and your crawler and burn your house down and possibly start another chernobyl. and end the planet and the universe as well.
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07-28-2005, 11:29 AM
| #36 |
| Quarry Creeper Join Date: Jun 2005 Location: Maryland
Posts: 319
|  read the specs. 6volt. and running something at 6.3v is a hell of alot different than 7.2-8.4v fully charged. I dont care what you do. I ran full power. It burnt up, this is how I am fixing it. Do whatever you want. Last edited by JamisonWorkshop; 07-28-2005 at 11:31 AM. |
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07-28-2005, 03:50 PM
| #37 |
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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thank you JamisonWorkshop !!!! also some one said something about servos being anolog devices above.... THERES THINGS CALLED DIGITAL SERVOS!!! |
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07-28-2005, 04:56 PM
| #38 | |
| Quarry Creeper Join Date: Oct 2004 Location: Hopkinsville
Posts: 493
| Quote:
Ease up dude. This is a discussion...not an argument. If someone prefers to run a regulator to solve a problem THEY have had then that's the way they will run it. There ain't a right or wrong way to do this junk. Trial and error baby! Heavy | |
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07-28-2005, 08:30 PM
| #39 |
| Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!!
Posts: 949
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seriously dude ... and thanks heavy!
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07-29-2005, 04:20 PM
| #40 |
| Rock Crawler Join Date: Aug 2004 Location: woods cross utah
Posts: 523
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im not saying it wont work im just taking their point about voltage to an extreme. as for the cs 80 melting stuff thats what i would expect from a low end servo. its only 1.2 volts different than a receiver pack with 5 cells. ive ran my servos with that setup for 9 months now with no problems.
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