XPost: sci.electronics.design   
   From: ehsjr@bellatlantic.net   
      
   West wrote:   
   > Using a 555 or similar type chip, I would like to have the output change   
   > from low to high or high to low every time the system is turned on. IOW, the   
   > output is a high, then the system is turned off. When the system is turned   
   > back on, the output goes low. Each power up of the circuit changes or   
   > "flips" the output state. I am willing to incorporate CMOS and a battery   
   > back up in the design. Some of the ideas I entertained is a divide by 2 in   
   > front of the toggle, giving me the same state every other time. However, I'm   
   > not sure how to do this practically or if it's the way to go. Any   
   > suggestions out there? All comments welcomed and thanks.   
   >   
   > west   
   >   
   >   
      
   Can you use a mechanical device? A motor driven   
   cam or something like a car door lock solenoid,   
   with switches & logic to determine direction?   
      
   A mechanical setup has the disadvantage of slow   
   speed/large size, and the advantage of retaining   
   the last "setting" forever without needing power.   
      
   Ed   
      
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