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Re: [LUG] Battery powered Pi

 

On Mon, 17 Jun 2013, Tel Bonic wrote:

On 15/06/2013, Gordon Henderson <gordon+lug@xxxxxxxxxx> wrote:

Really for TomB, but for anyone needing 5v off batterys, then use an SMPS
regulator rather than a bog-standard 7805... I've used these:

http://uk.farnell.com/xp-power/sr10s05/switching-regulator-5v-1a-o-p/dp/1861095?Ntt=sr10s05

but there are many others. Just search ebay if that's your thing. Also
looking on the mobel radio-control/robotics sites for something called a
BEC or UBEC - does the same thing - provides 5v from batterys via a
swsitching regulator, so low-loss (ie. doesn't get hot enough to burn
fingers!)

Is is better to use a linear regulator to introduce the least noise
into the system?  It probably doesn't matter to most but I'm making a
battery powered pi/rtl-sdr radio over ip setup, just about to sort
this section out.  Seems they make 20mhz noise (10% load) - which lies
between two amateur bands I want to rx.  Stick with a linear regulator
or is there a better choice out there?

I don't know, is there? I'd have thought that with adequate decoupling any noise wouldn't be much of an issue anyway.

I also think you'll find a Pi leaks all sorts anyway - stick it in a metal box.. (single command and you've got a 100MHz transmitter too)

Gordon

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