Wolfgang and others on this topic:  I really appreciate the tone when people try to diagnose a problem, suggest fixes and generally add to the knowledge base of the group.   I can't recite any electronic credentials or any aircraft building skills but I do enjoy listening about projects that might or might not work and why.  So, if Wolfgang makes a suggestion that isn't 100% perfect or if a circuit is suggested that might not make it onboard the shuttle then that's ok too.   But, when individuals take it upon themselves to warn listers they have to think twice before answering or shredding someone's opinion it serves no purpose but to shut down discussion.   If the "moderator" is going to permit people to specifically target individuals and demean their character in the eyes of others then that is the list owner's right but it erodes participation by some of us who aren't as skilled or thick-skinned.  Some brute editing or "return to writer" would go a long way to improving the tone in 2010.