i tried it on pcb i made a pcb for particularly for this but i cont able to complete it
when ever i preess any button there is no change in out put of 373 even it was OE/LE are properly done by seeing 373 data sheet.if i triggered @147 outputs display shows properly i changed 147/ 373 too.
The person that made the fix is banned (too bad), Ammarah only made one post in the last 4 years and this thread started in August 2006. You might want to pull the circuit and re-upload it in a new thread and see what help you can get. There is another quiz buzzer thread here somewhere, you can search for quiz and maybe game and find it. I posted one, but it required a PIC programmer.