Hi,
I'm new here, so excuse me if this has been discussed before, but I couldn't find a search feature.
Here's my problem. I have a breadboard (JE27 from Jameco), and I have a DC supply plugged into it from the wall, which gives me about 6.5 volts. The breadboard has a metal base plate, and the actual breadboards connected together are attached on top of it. I've been trying to use some logic gates such as AND, OR, NOT, and so forth... Something strange has been happening though.
First of all, I can't seem to get anything to work right besides my NAND (CMOS 74AC00) gates. And they only work when I am touching the metal base of the breadboard. Does this seem strange to anyone? If I'm not touching the metal, the LED I have attached to the output of the gate, won't light up. I should be plugging everything in correctly. I have the Vcc and ground connected on the chip, and the inputs and outputs are correct. Could this be something wrong with my board, or does this normally happen?
Also, the other gates do not work correctly at all. For example, when I try an AND gate, it will act like an OR gate. A NOT gate just doesn't work, and the OR gates are acting strangely. Again, I'm supplying the Vcc on the chips with the 6.5 DC voltage, which says it should be within the limits (-0.5v -> 7.0v) of the chip. All these chips are CMOS 74AC series that I bought from jameco.com.
I'm fairly new to using cmos chips at all, so all of this is probably something I'm doing wrong, so any help at all would be greatly appreciated. If any more information is needed on my problem, I'll gladly supply it.
Thank you.
I'm new here, so excuse me if this has been discussed before, but I couldn't find a search feature.
Here's my problem. I have a breadboard (JE27 from Jameco), and I have a DC supply plugged into it from the wall, which gives me about 6.5 volts. The breadboard has a metal base plate, and the actual breadboards connected together are attached on top of it. I've been trying to use some logic gates such as AND, OR, NOT, and so forth... Something strange has been happening though.
First of all, I can't seem to get anything to work right besides my NAND (CMOS 74AC00) gates. And they only work when I am touching the metal base of the breadboard. Does this seem strange to anyone? If I'm not touching the metal, the LED I have attached to the output of the gate, won't light up. I should be plugging everything in correctly. I have the Vcc and ground connected on the chip, and the inputs and outputs are correct. Could this be something wrong with my board, or does this normally happen?
Also, the other gates do not work correctly at all. For example, when I try an AND gate, it will act like an OR gate. A NOT gate just doesn't work, and the OR gates are acting strangely. Again, I'm supplying the Vcc on the chips with the 6.5 DC voltage, which says it should be within the limits (-0.5v -> 7.0v) of the chip. All these chips are CMOS 74AC series that I bought from jameco.com.
I'm fairly new to using cmos chips at all, so all of this is probably something I'm doing wrong, so any help at all would be greatly appreciated. If any more information is needed on my problem, I'll gladly supply it.
Thank you.