Hello,   
      
   What are some examples of oscillators which don't require transistors or   
   vacuum tubes?   
      
   So far I found relay oscillators and the Pearson-Anson oscillator.   
      
   Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would   
   it work on LEDs as well?   
   https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect   
      
   Relay oscillators look neat too but I don't imagine they would last very long   
   at high frequencies.   
   https://www.youtube.com/watch?v=WuG4nOyF99s   
      
   Thanks,   
      
   Michael   
      
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