Hi Rowland Up to now you did not tell us that you use 9V for motors that consume maybe much more power than a BBB. If you Project is a little Segway or robot car where it is okay when the battery is down after 20 Minutes or so, then go ahead with the 7805. You can solder this together even without PCB. And, because it's a students project it's maybe safer not to use lipo's..... they tend to explode if not charged correctly:-(
Dieter On Wed, Nov 13, 2013 at 4:03 PM, <[email protected]> wrote: > I agreed there are better solutions available and that is really what I am > asking... what are those better solutions? For what I am looking to do is > having everything needed to run the BBB off battery for as cheap as > possible. We are designing a hardware setup for students to use and they > have to be able to buy all the components for as cheap as possible. The > problem with Lipo (from what I have seen) is that the chargers are the > expensive part. > > Here is where I am at right now. Need at least 9V for running motors as well > as the BBB. > 3-cell Lipo = $9 from HobbyKing > Lipo charger = $12 from HobbyKing > Lipo charger power supply = $8 from Amazon > Voltage Reg, diode, caps, wires etc. = $3 from DigitKey > > This might be the best solution. But my thought was students might already > have AA battery chargers at home. > > Thoughts? > > Also, can you point me to a better circuit design that doesn't use the 7805? > > -Rowland > > > On Monday, November 11, 2013 4:22:39 PM UTC-5, Dieter Wirz wrote: >> >> Ron is perfectly right! >> And where do you get cheap rechargeable batteries? >> LIPO prices are going down >> alcaline prices are going up >> >> Do you really want to invest time and money in last millennium >> alcaline technology? >> >> 7805? If you connect 9v to an 7805 about 40% of the power is converted >> to heat. There are much better solutions available. >> >> BTW @Ron: What buck/boost regulators are you using. Maybe you can >> provide some hints to the community... I have the ADP1111 sitting on >> my Desktop, but I did not find the time to solder something >> together..... > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
