[450] The link on batteries

[David McKenzie]

I'm currently testing it with 8x generic AAs in series. So that's probably
about 2500mA @ 12v. The raspi with wifi/soundcard running the link with my
ssh session open is drawing around 275mA average from the batteries
measured on the battery side of the dc/dc converter. It's been up for about
40 minutes and the batteries are reading a steady 12.01 volts. I don't know
how long it will take before Vin < Vout (it just passes through lower than
set voltage) will be enough to turn off but a back of the hand calculation
of 2500mAh / 275mA = about 9 hours of run time.


On Thu, Oct 10, 2013 at 12:05 AM, David McKenzie <k1fsy at vhfwiki.com> wrote:

> no, ~5.6v (because AAs run hot) down to 5v.
>
> that's a LM2596 switching regulator board; Vin > Vout only. I have 10 of
> them now. Supposedly something like 95% efficient. That's an 8-cell battery
> pack I should load it up and give it another test.
>
>
> On Wed, Oct 9, 2013 at 11:50 PM, John Foege <john.foege at gmail.com> wrote:
>
>> 4 AAs in series? 5.2V to 12V DC-DC regulator?
>>
>> Can you set it for 1.3V to 13V and run the batts in parallel?
>>
>> I'm assuming this doesn't make any difference in run-time due to either
>> having a 1800 mAh 5.2V cell or a 1.3V 7200 mAh cell with the
>> converter...unless I'm having a massive brain fart...
>> On Oct 10, 2013 12:04 AM, "David McKenzie" <k1fsy at vhfwiki.com> wrote:
>>
>>>  Got the switching regulator modules from China. It ran for 3 mind on
>>> those 4 nearly dead AAs :)
>>>
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