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 combination logic gate..plezz help me...

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udeorange Posted - Dec 16 2012 : 02:23:30 AM
can i get the schematic of lamp countdown timer with seven segment using combination logic gate... i want the operation of this circuit without using a microcontroller.. this circuit will operation when the user 'switch on' (set time), counter-down will start count (example : 9 to 0 second),when 0 the lamp will turn OFF. Conclusion, this ciruit operation : lamp will turn OFF by time set by user. plez anybody help me....
i only get the countdown using flip-flop.how can i want to used with timer..???

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