[sdiy] discrete SSM2018?

[jhaible at t-online.de]

> One thing I can answer, is about the structure of the 
> bipolar 
> transistors in a planar process.  I drew some crude 
> pictures: 
> 
> 
> http://members.home.net/sbernardi/img/bipolar_process.ht
> ml 

Thanks !

Now this is where my knowledge ends. While I can vaguely 
see how these structures basically work, I have no idea
what degrees of freedom they include.
Looks like a multiple emitter is easier than a multiple 
collector ...

JH.