From: phil_a@tpg.com.au   
      
   "Alex Pogossov"   
      
   ** Ever heard of  " trimming " ???   
      
      
   > The burst generator may be useful, but the design is arcane... like we are   
   > not in 2013, but probably in 1963.   
   >   
   > Attached is a simpler and much cheaper circuit. Cheaper than a CD   
      
   ** What a blatant, stupid  LIE.   
      
      
   > possibly more convenient than fiddling with audio files editing on a PC.   
   > http://www.valveradio.net/en/home/audio/burst-generator.html   
      
   ** That POS will never do the job properly -  you must have zero crossing   
   switching at both ends of a burst and an equal number of positive and   
   negative half cycles.   
      
   A test CD will give you that plus standard conditions for burst frequency,   
   length and repetition rate.   
      
   None of which matters one a HOOT to a hobbyist audiophile.   
      
   Cos he can use music programme and a scope to see what is really going on.   
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)