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What Ac/ Dc Adapter Should I Use

I just have a quick question. What kind of AC/DC adapter should I use? I just want to be sure not to break anything. Right now I am just working off of battery which dies off quickly some times. Thanks!


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#14  
No worries... We don't want to turn your bear into Smokey the Bear.... Have fun....:)
#15  
Lol thanks. I did try a DC 6 volt adapter that I had. It made the servos move a little, but it didn't turn on the actual ez v4.
#16  
6V will work if the power supply is rated above 10amps or more.... Remember you need amps to run servos.... voltage between 6V and 8.4V should be ok.... 7.4V is ideal however...
PRO
Synthiam
#17  
If the ez-b didn't turn on, that adapter may have had the incorrect polarity. The polarity is positive (+) in the middle of the plug, and negative (-) on the outer side of the plug. The plug is actually called a Barrel Plug or Barrel Jack.

Most of the transformers that you will find around the house are not digital switching. They use a transformer, which is two wounds of wire at a ratio which conducts electromagnetically across the two and produces a lower voltage in respect to the wire ratio. What that means is, those transformers literally only contain a spool of wire that lowers the input voltage by a pre-defined ratio. Then a simple Diode is used to flatten one line of the AC current to produce simulated DC current.

In short, a transformer power supply is not a great selection to power a robot. A digital switching power supply is the best option - specifically one with providing between 6 and 8 volts DC current at more than 6-8 amps for your application. If you add more servos, the number of amps will need to be increased.

If you want to get crazy, use a PC power supply:) That's what we use!
#18  
Like a power cord that I have for my laptop? Mines a ac adapter that has an output of 19 volts and 3.42 A
#21  
You should buy this though....7.4v 5200mAh Lipo You can use the ez robot charger to charge it. It is a big battery that will last much longer than the 1300mA ez robot battery...
#22  
I use the basic 6 aa batteries. They last about 5 hours, so I think for now I'll get more to swap out.:)
PRO
Synthiam
#23  
Wow, 5 hours on the 6 aa batteries is great! I would not have expected that. I'm looking forward to seeing a video of your robot when he's ready!
Israel
#25  
Hello, all.
In my old EZ-B version 3 of the robot, I used double power.
Small power proper for EZ-board = + 7.4V 2800mAh
& for the rest "power units: 6 servo, Cam, MP3, Light, 6 sensores" = + 11.1V 4000mAh + step-down DC-DC regulator +5V 6000mA.
What about new V4?
I'm trying to find the technical details about the new V4 robot.
Correct Supply voltage, current consumption in rest (hold) mode,
the maximum current consumption, etc.
Where can I find this information?
Another option is very important to me:
What the average range of wireless communication in the home and outdoors?

Thanks for your attention.
Israel
#27  
Dir DJ Sures, you write about your power servo 7.4V!
Does this not reduce the service life of engines?
I thought that this is the maximum voltage for small servo is 6V?
(how I lagged behind you for two years! :-( ...
Israel
#28  
Hello, CochranRobotics!
Thanks a lot for the tip on the documentation!
#29  
The HD servos are made to run at 7.4V. If you took a servo that was made to run at 6V and ran it at 7.4V, yes, you would reduce the life of the servo. These are not 6V servos running at 7.4V though. They are made to run at 7.4V. I have many of these running for about a year and a half of normal use at 7.4V without any issue.
Israel
#30  
Thanks for clarifying.
On the one hand this solution is convenient and saves energy,
on the other - forced to buy only the EZ-B servos.
#31  
You don't have to run the EZ-B from 7.4V. It can be run from 6V which would allow you to then use anyone's servos. You could also regulate the power off of each of the servo wires if you wanted to go 6V. Either way, your not locked into buying servos from EZ-Robot. This is a convenience that helped them to make their revolution robots without having to regulate power inline for them to work well.
Israel
#32  
Thanks for clarifying, CochranRobotics!
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