Hello,
I am currently taking a computer engineering course and I am required to build a practical application of logic gates. For the activity, I have chosen to do a combination lock, with the use of DIP switches, logic gates, and more.
I have found the AllAboutCircuits' simple combination lock schematic, which is http://www.allaboutcircuits.com/vol_6/chpt_7/7.html.
In addition, I have also created a schematic in TINA, found here:
http://i.imgur.com/pFdJp.png
Finally, after the schematic being approved, I built the circuit. Here is how it looks:
http://i46.tinypic.com/2ahccgn.jpg
My teacher told me that the wiring is correct, however, the LED's are not lighting up. If I were to place an LED under a DIP switch, the LED would light, but not in the XOR gate's outputs.
The logic chips I used are 74LS-series of logic gates. In the picture, certain wires may look as if they are not inserted, but are just stripped too much.
I cannot seem to find what the problem is, or how to solve the issue. How can I make the LED's light up? Is the 9-to-5 V converter necessary? How can I get the DIP switches to work with logic gates?
Thank you.
I am currently taking a computer engineering course and I am required to build a practical application of logic gates. For the activity, I have chosen to do a combination lock, with the use of DIP switches, logic gates, and more.
I have found the AllAboutCircuits' simple combination lock schematic, which is http://www.allaboutcircuits.com/vol_6/chpt_7/7.html.
In addition, I have also created a schematic in TINA, found here:
http://i.imgur.com/pFdJp.png
Finally, after the schematic being approved, I built the circuit. Here is how it looks:
http://i46.tinypic.com/2ahccgn.jpg
My teacher told me that the wiring is correct, however, the LED's are not lighting up. If I were to place an LED under a DIP switch, the LED would light, but not in the XOR gate's outputs.
The logic chips I used are 74LS-series of logic gates. In the picture, certain wires may look as if they are not inserted, but are just stripped too much.
I cannot seem to find what the problem is, or how to solve the issue. How can I make the LED's light up? Is the 9-to-5 V converter necessary? How can I get the DIP switches to work with logic gates?
Thank you.
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