XPost: sci.electronics.design   
   From: nospam@gte.net   
      
   "West"  wrote in message   
   news:ha36j.27973$o_6.25883@trnddc08...   
   > 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   
      
   The professor wants a small box (3"X5") with 4 components on the front panel   
   An on-off power switch to turn off a 5v to 12v power supply. A green LED   
   located near the switch to indicate power on. On the left side of the box   
   there will be 2 LEDs, 1 blue and 1 red.  When the power if off = no lights.   
   When the power is turned on the green and blue LEDs will light. The next   
   power on the green and red LEDs will come on, etc., etc,..   
   Next semester we will go further with this but for now, that's all I can   
   say. Still want to help?   
      
   west   
   >   
   >   
      
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