Good designs of Expo Converters? Was: [sdiy] Multiplexed Expo Converter?

[Aaron Lanterman]

On Aug 1, 2009, at 1:12 PM, cheater cheater wrote:

> Not to be picky, but are there other designs than the ASM-1 EC? I find
> it's good to always compare at least 2-3 ways of doing things... and
> maybe come up with something that borrows the good bits from more than
> one :^)

People have tweaked it in all sorts of ways, but it's kind of hard to  
beat that overall design.

In older designs you'll find things using PNP/NPN matched pairs  
(instead of two NPNs or two PNPs), but that kind of went out of style.

- Aaron