[sdiy] Best way to get a +3.3V rail from +15V?

[Jim Credland]

I diligently followed the rules in the datasheet for keeping it to a
minimum.  Nice star grounding (looks pretty on the PCB), everything very
close together.  I'm curious to know whether I've nailed it, but no
decent idea how to measure for radio noise.  Stupidly I met an EMC
specialist from UKAS at work last week (in connection with something
entirely different) and didn't ask him! Doh!

On Thu, Mar 7, 2013, at 09:24 PM, Tim Ressel wrote:
> That is the solution I would have gone with. the 125KHz switching speed
> keeps the inductor low and the noise above the audio range. The only
> caveat is layout. If your not careful with the ground loops you can make
> lots of radio noise or even make the beast misbehave. Since we are not
> concerned with getting a CE mark, it'll probably be fine.
> 
> 
> Tim Ressel
> Circuit Abbey