From: pchung705@gmail.com   
      
   Relaxation Oscillator circuit is a perfect example of  regenerative feedback   
   that is special case of positive feedback. Simple and efficient, this circuit   
   is practical for students labs and still applicable in the blinking turn   
   signal on motor vehicles,    
   use in stroboscopes and as the time base in early oscilloscopes and television   
   receivers.   
      
   Read more:   
      
   http://www.cirvirlab.com/index.php/tutorials/169-relaxation-osci   
   lator-with-two-transistors-astable-multivibrator.html   
      
      
   and also simulate:    
   http://www.cirvirlab.com/simulation/Relaxation_Oscillator_Online_Simulation.php   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)