From: hwabnig@.-   
      
   On Sat, 24 Feb 2018 15:52:35 -0800 (PST), jurb6006@gmail.com wrote:   
      
   >I know I am losing it, but I want to bring it back.   
   >   
   >I have screwed up some things. Figuring out a roll of wire, I had 95 turns of   
   about 12" diameter. I thought pi was times radius, and that is because of not   
   using it. And then I thought there was 1,700+ feet in a box that came with   
   1,000 feet. I had    
   forgotten to divide by 12 to get feet out of inches.   
   >   
   >Losing it. Someone just commented on that in SED. Well I want it back.   
   >   
   >A recent gaff was about an OP AMP circuit. Had a 10 K resistor from output to   
   the - input. There were other 10 K resistors that fed it. At the beginning it   
   completely escaped me that it iis feeding a null point and there is no   
   current. I should have    
   known that offhand.   
   >   
   >But math is a bi challenge to me. I understand some. Interpolating variables   
   like 12=4X3 and 12/3=4 and all that. I can also handle the 3a and 4b stuff.   
   When they got to polynumials in school the lost me.   
   >   
   >And now things seem to have changed. I never heard o tau before recently,   
   apparently it represents a change in some variable. I thought delta did that.   
   So, what is the difference ? i have not gotten an answer I can understand   
   anywhere.   
   >   
   >I finally figured out something about the input impedance of a common emitter   
   amp stage. If the collector is tied right to the supply it is Re times hfe. I   
   thought when there is resistance to the collector that this would change, but   
   now I  think it    
   doesn't. Looking at the curves of collector current it seems stable with   
   voltage changes. That means it has no effect and under normal condition like   
   no clipping etc. so it is still at least close to Re times hfe.   
   >   
   >If someone wants to help I am all ears. Because of my eyesight it is   
   difficult to read and upgrade my skill set. I am hoping they can fix that and   
   I have no shame taking medicaid because I DID pay taxes for many years and I   
   really cannot work now.I fix    
   stuff in the basement but not fast enough to charge by the hour.   
   >   
   >So really, in this thread I intend to pose questions and hopefully get good   
   answers. If you have the extra time of course.   
   >   
   >The first thing is what the hell is tau exactly ?   
      
      
   They invented TAU to avoid the letter Pi.   
   It is a Greek letter, pronounced "Pe" in English mumble.   
      
   Because the Muricans and Britts cannot pronounce anything correctly.   
      
   They say "pie" stealing a piece from Grandmother's apple-pie.   
      
   https://www.bettycrocker.com/recipes/scrumptious-apple-pie/   
      
   Trying to speak like a human, they inadvertently say "pee",   
   feeling wet between their legs.   
      
   That's the whole TAU story.   
      
      
   w.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)