XPost: sci.electronics.design   
   From: rich@example.net   
      
   On Fri, 07 Dec 2007 03:33:33 +0000, 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.   
      
   Why a 555? Did the teacher say so? Because that's not the chip you'd   
   use here, unless you're looking for a one-shot to generate the toggle   
   pulse.   
      
   You should ask the teacher why he/she wants to use a 555 here, and   
   report back.   
      
   Good Luck!   
   Rich   
      
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