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I'm using a keil product.
Can I connect 5V 74LS00 to 3.3V 74HCT74?
Thank you.
But the question isn't about a Keil product, is it?
You haven't improved your chances of help by rudely butting-in to unrelated threads, and repeating questions when the necessary information has already been given!
Anyhow, you should by now have (or know how to obtain) the datasheets for the 74LS00 and 74HCT74 - have you read them yet?
Look at the output specifications of the 74LS00, and the input specifications of the 74HCT74 - they will answer this question for you...
Sorry,
I have the data sheets but I don't understand them and cannot find the answer.
Can you help please?
Sounds like what you need is not just an answer to this question - what you need is to take a step back and find some books and/or tutorials on basic digital electronics.
What is your previous electronics experience?
en.wikipedia.org/.../Electronics
Not very much.
I've been given two breadboards to put together and been told to get them talking.
Can you suggest any good forums for electronics please?
Thanks
"I've been given two breadboards to put together and been told to get them talking."
Who gave you these?
Why did they assume that you'd be able to do it?
Can't you just explain that you need some (more) basic training before you can complete this task?