"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