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

[Jim Credland]

I've been using a MAX5033 switching regulator on a tiny PCB to get a 5V
rail and then an LDO part on the module itself to get the 3.3V out.  The
MAX thing was a piece of cake and seems remarkably low-noise.  

What I'd really like to do is convert the -12V rail which is under used
in the synth though to the +5V rail.  I'm sure it's possible but even
thinking about the problem turns my head upside down.  Do I use two
parallel step up converters? 

On Thu, Mar 7, 2013, at 03:40 PM, Scott Gravenhorst wrote:
> 
> I'm wondering about using another regulator between +15 and +3.3.  Maybe
> a +8v.  I would think
> that the heat dissapation should be less for the +3.3 regulator.  Some
> heat might also be expected
> on the +8v reg.  It's either that or a power resistor as previously
> mentioned.
> 
> -- ScottG
> ________________________________________________________________________
> -- Scott Gravenhorst
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-- 
  Jim Credland
  jim at cernproductions.com