Re: Apple IIgs 200w Power Supply

[Roger Johnstone <news2006@roger.geek.nz>]

In <IoOdnYucBdm-NUXenZ2dnUVZ_tednZ2d@comcast.com> Henry wrote:
>
> Okay, math lesson over. ;)  I'm not too sure what you mean by "new 200 
> watt  power supply really heavy power supply?".  If you mean the 
> weight, it  actually weights a little less then the original supplies 
> since it's a  "switching" supply and not "linear".  A switching supply 
> doesn't need a big  heavy transformer like the older supply's do.  
> They convert the AC from 60  cycles to a much higher frequency which 
> is much more efficient way to  convert power.

The Apple II/II+/IIe/IIGS all use switching power supplies, not linear. 
Indeed the use of a switching suply was one of the big advances of the 
original Apple II. I've seen the power supplies used in some S-100 
computers from the late 1970s: huge transformers and big power 
transistors mounted in large metal boxes!

Modern switching supplies are a lot more space-efficient though, mainly 
because they operate at higher frequencies (which allows for smaller 
transformers) and they use much more efficient semiconductors.

-- 
Roger Johnstone, Invercargill, New Zealand
http://roger.geek.nz/
________________________________________________________________________
  No Silicon Heaven? Preposterous! Where would all the calculators go?

              Kryten, from the Red Dwarf episode "The Last Day"