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Permalink Reply by JL on December 18, 2017 at 3:47am

2 thoughts: a power only usb cable that takes care of the dummy for the data wires, such as  https://www.adafruit.com/product/2379

or browse your local store with RC cars, they run on rechargeable packs with a variety of voltages

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Permalink Reply by Jerry Jordan on December 19, 2017 at 4:02am

I buy the little LM386 PCB's off Ebay for $2 each. I run them off throw away wall warts that are rated 5V, 9V, and 12V. They run on 5V just fine, with a dirtier output than using 9 or 12V. If you wanted to give it a try with out the bucky board.. your on the right track.,.,plenty of options...

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Permalink Reply by Timothy Hunter on December 20, 2017 at 12:58am

mines in a frame somewhere say diploma engineering ( electronic systems and computer systems ) never really got to use it..company i was working for went under before i finished it... 3 years of night school then 1 year full time.. thank god thats over....( finished back in 1988) 

anyway JL's cable might work depends on the power bank you use. the RPi has the necessary circuits on board to get powered. and they assume it wont be by battery either. the trouble with USB is its a negotiated protocol. the device talks to the charger/battery bank and tell it how much current it will allow....

it all depends on how much effort you want to put in to not using a 9V battery Paul. most battery banks use 18650 lipo batteries. nominal voltage is 3.7 but at full charge they are 4.2. so you could use 2 cells get 7.4V to 8.4V . that should run the 9V circuit fine... just might have to charge the cells individually.

my problem is the boards i got are class d amps and have a 5 V to 5.5V max battery input . 

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Permalink Reply by JL on December 20, 2017 at 1:37am

The manufacturer's spec sheet for the ARTEC amp board that Gitty sells states it will run on 5v-12v.

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