On Monday, October 29, 2018 at 5:34:29 AM UTC-7, jurb...@gmail.com wrote:   
   > The vibrator in an old car radio. Not only does it oscillate without   
   transistors or tubes, some rectify without diodes. A second set of contacts   
   make for a synchronous rectifier.   
      
   Amazing!   
   https://en.wikipedia.org/wiki/Vibrator_(electronic)   
      
   How long did they last?  A year or so?   
      
   Thanks!   
      
   Michael   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)