Re: [Discuss-gnuradio] Mobile Power Supply for USRP

[Daniel O'Connor]

On Monday 07 May 2007 11:24, Matt Ettus wrote:
> Most of the daughterboards regulate the 6V down to 5V, so you really
> need about 5.5 to 5.75 V to operate correctly.

Ah right, I didn't realise they powered off the "before" section of the 
regulator.

Going straight to 3.3V would be suboptimal for noise anyway and probably 
not save you that much.

> Matt
>
> Daniel O'Connor wrote:
> > On Monday 07 May 2007 00:29, Eric A. Cottrell wrote:
> >> Is there a off-the-shelf product to power the USRP from 13.8
> >> volts? My understanding is the USRP needs a couple of amperes at 6
> >> volts. The best I saw was 1 Ampere maximum output.
> >
> > I think you could use DC-DC converter that outputs 5V.
> >
> > The dropout on the regulator used is 1.5V, and 3.3 + 1.5 = 4.8V.
> > Not a lot of headroom but it should work OK.. Right? :)
> >
> > You could test it using your PC power supply before spending money
> > too.
> >
> > Farnell sell DC/DC converters that will do the job but they are not
> > cheap (>AU$100)
> > http://au.farnell.com/jsp/Electrical/Power+Supplies+&+Converters/PO
> >WERBOX/PBBA-1205F/displayProduct.jsp?sku=3821067
> >
> > They also sell DC/DC converters that will go down to 3.3V but then
> > you would need to remove the existing regulator and it would almost
> > certainly be much noisier without the linear regulator in there.
> >
> >
> >
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-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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