[sdiy] Wallwart questionne

[Peter Grenader]

thanks for this sage advice, Neil..

P

Neil Johnson wrote:

> Peter,
> 
> When you say "12  and 5 volts" do you mean +/- 12V??
> 
> Two options:
> 
> 1) Use an AC wallwart so you can get both + and - volts (even feed it into
> a small step-up transformer first).  This would also give you a central
> "ground" for your bipolar supplies, unless you want to generate a virtual
> earth yourself.
> 
> 2) Use a DC-DC converter system, which can then take in anything over a
> wide range and give you what you need.  In which case a DC output wallwart
> would do.  For this, check out the Linear Tech range of converter chips.
> 
> There are many answers to this, and I think you'll need to give more specs
> before a more concrete solution can be worked out (e.g. you say nothing
> about what the circuits are, what the loads are per rail, what noise
> performance is required, conversion efficiency, etc etc).
> 
> Cheers,
> Neil
> 
> --
> Neil Johnson :: Computer Laboratory :: University of Cambridge ::
> http://www.njohnson.co.uk          http://www.cl.cam.ac.uk/~nej22
> ----  IEE Cambridge Branch: http://www.iee-cambridge.org.uk  ----
>