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<http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=32951> Lipo charger = $12 from HobbyKing<http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=41636> Lipo charger power supply = $8 from Amazon<http://www.amazon.com/Adapter-Power-Supply-LCD-Monitor/dp/B003TUMDWG/ref=sr_1_11?s=electronics&ie=UTF8&qid=1383430607&sr=1-11&keywords=12v+4a+power+supply> 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.
