Power Questions - i.e. Voltage
#1
Posted 30 September 2010 - 01:08 AM
#2
Posted 30 September 2010 - 01:23 AM
#3
Posted 30 September 2010 - 01:41 AM
Correct me if I am wrong, but what about internal resistance?
ummmm didnt think about that.... I dont really know. I guess what I'm asking is what can I do to get a battery with high amps and at least 9V... cuz they sell them for RC model airplanes, but those are crazy expensive
#4
Posted 30 September 2010 - 01:58 AM
#5
Posted 30 September 2010 - 01:59 AM
Well, you could put two of the 6V batteries in series to get 12V.ummmm didnt think about that.... I dont really know. I guess what I'm asking is what can I do to get a battery with high amps and at least 9V... cuz they sell them for RC model airplanes, but those are crazy expensive
With a regulator, it's fairly easy to *decrease* the voltage. But, in general, it's not easy to increase the voltage of a DC source.
Increasing the voltage generally involves converting DC to AC (or a DC square wave), passing it through a step-up transformer, and converting back to DC.
But if you do that, then the current will decrease proportionally with the voltage increase (actually, you'll lose even more current due to losses in the transformer, etc.).
~ David ~
#6
Posted 30 September 2010 - 02:16 AM
#7
Posted 30 September 2010 - 02:19 AM
I have run the Netduino, and Parallax boe bot chassis on 4 AA batterys. ( 4 x 1.5 = 6Vdc)You can step the voltage all you want, but it will come as a cost of current. 6V probably would power the Netduino, not 100% on that though, I haven't looked at the schematics yet.
I have been using the same batteries for over a week and had several test runs of the chassis. So I would say, 6VDC will just make it.
Remember you lose about 0.6-1.0 volts to a regulator and the Netduino wants a solid 3.3 Vdc for main power and 5Vdc +- 10% so your can get by.
#8
Posted 30 September 2010 - 02:22 AM
EDIT Perhaps this is closer :/ http://www.newegg.co...4-416-_-Product
I like Li-ion
#9
Posted 30 September 2010 - 02:29 AM
#10
Posted 30 September 2010 - 03:00 AM
Or... $12.15 -2350mAh 2S - should run a netduino for more like 24hrs.
No need to spend crazy amounts of money when you have hobbyking to look to
#11
Posted 30 September 2010 - 03:07 AM
#12
Posted 30 September 2010 - 03:49 AM
#13
Posted 30 September 2010 - 07:38 AM
#14
Posted 30 September 2010 - 09:32 AM
Well, in the meantime I found this: http://www.newegg.co...7-874-_-Product I think the Amp hours are a bit high?
EDIT Perhaps this is closer :/ http://www.newegg.co...4-416-_-Product
I like Li-ion
Both of those are ok - the netduino will pull what ever current it requires providing the batteries can supply it. Batteries and PSUs do not _push_ current or amps, they only have the capacity to supply what is required.
Take a seat, I'll be right with you.
#15
Posted 14 October 2010 - 05:01 AM
How about something like this? $4.95 -1000mah 2S lipo (7.4v nominal) - should run the netduino for about 10hrs.
Or... $12.15 -2350mAh 2S - should run a netduino for more like 24hrs.
No need to spend crazy amounts of money when you have hobbyking to look to
I thought of LiPo batteries, but you have to be careful not to drain them below about 3.0 V, or you risk damage to the cell. I suppose it's possible to build something to measure voltage?
#16
Posted 14 October 2010 - 05:27 AM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users