I am trying to complete a project and am quickly nearing the deadline. The project is as follows:
"The circuit will display an elapsed time, 0 to 15 seconds, repeating continuously. A two digit display will indicate 0 to 15. A green LED will be lit from 0 to 5 seconds, a red LED from 6 to 10 seconds, and a buzzer will sound from 11 to 15 seconds. A 555 timer and 741 op-amp must be incorporated into the project."
I have been working with the following:
5V Vcc
two 7490 decade counters
two 7447 BCD (7-segment decoder)
one 741 Op-amp (required)
one 555 timer (required)
two seven segment displays
various resistors and capacitors
I have attached my current schematic. I have torn down and rebuilt this circuit many times. I currently cannot even activate the attached 7-segment LED. I will need gates (NOR, I think) for the yet-to-be-added LEDs and buzzer. Also, the op-amp is not yet incorporated in the schematic.
Thanks for any help all of you can provide!
"The circuit will display an elapsed time, 0 to 15 seconds, repeating continuously. A two digit display will indicate 0 to 15. A green LED will be lit from 0 to 5 seconds, a red LED from 6 to 10 seconds, and a buzzer will sound from 11 to 15 seconds. A 555 timer and 741 op-amp must be incorporated into the project."
I have been working with the following:
5V Vcc
two 7490 decade counters
two 7447 BCD (7-segment decoder)
one 741 Op-amp (required)
one 555 timer (required)
two seven segment displays
various resistors and capacitors
I have attached my current schematic. I have torn down and rebuilt this circuit many times. I currently cannot even activate the attached 7-segment LED. I will need gates (NOR, I think) for the yet-to-be-added LEDs and buzzer. Also, the op-amp is not yet incorporated in the schematic.
Thanks for any help all of you can provide!
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