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I have pointed out the flaws in your circuit in previous posts.shermaine said:Hi,
Thanks so much for your reply. I have just brought the ic yesterday and will try to do the wiring of urs and try out 1st. Btw, from my circuit layout, beside the adder problem, what other problem is out there?
Do you mean the PCB layout?shermaine said:Hi,
May i know how you go about designing the layout?
Yes, the pin connections should be the same for all manufacturers.shermaine said:I got some taiwan brand of ic chip. Can i said for most of the IC chips of 7400, their connection points are the same despite different manufacturer? Please advise. Thanks.
You need to break the question down into the basic logic - as I did in earlier posts.shermaine said:I mean how did u plan the schematic layout? How do u go about doing it based on the question? Please advise. Thanks.
A(1) TTL does not need pull up resistors since Open = High. But CMOS does.shermaine said:Hi there,
I got a few questions before i start wiring your layout to test out.
Q(1) Does dip switch need 1kohm resistor ?
Do i need 3 1kohm resistor or 2 1kohm resistor?
Q(2) What does max/min 15 refers to?
Q(3) Why does input of U3a and U3b needs to connect to clk?
Q(4) Why 2 input of U3C need to connect to 5v?
Q(5) For Qb bar of U6b, do we need to conenct to gn?
Q(6) For dip switch, why does it need to conenct resistor to 5v?
Q(7) For IC 74191, why does A,B,C,D & En need to conenct to gnd?
Q(8)These unconected QA & QB, do we need to conenct to any point?
Q(9) What does D/U refers to pin?
Please advise soon.Thanks.