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> 2f. Re: Sound Devices updates the USBPre
> Posted by: "oryoki2000" oryoki2000
> Date: Thu Sep 16, 2010 3:45 pm ((PDT))
>
>
>> I think there are inexpensive components that do DC to DC constant
>> voltage today. You'd probably want to start with with 6 or 7.2 volts.
>
> Sonic Studios sells a high quality battery sled with 5V output that
> accepts C or D cells. Only problem is the price: close to $200.
> http://www.sonicstudios.com/batsys98.htm#microtrack
>
I found a YouTube link to a video showing how to build a USB battery.
They start with a 9-volt alkaline, connect it through a Zener diode
that regulates that down to 5.1 VDC, then a dropping resistor to get
to 5. Pretty simple! Could definitely fit into a cable. And should
work with a Tamiya 7.2V battery.
But I like the premade solutions like the Energizer that oryoki
mentioned. At 4000 mah, that could power the 500ma USBPre2 for several
hours.
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