Hi David (David VanHorn), in <028301bd7469$f0824820$e8f135ce@xenu.iquest.net> on
 Apr 30 you wrote:

> It's also shown in the "Bad idea" circuits on page 670

Now that you say it..  Unfortunately they don't tell why a circuit is a bad
circuit.  For me the learning effect of these pages is zero.  Therefore I
just ignore the bad circuit pages.

Does an addendum with explanations exist?