Controller by the book

Kurt_ · Post by **Kurt_** » Sun Apr 23, 2006 1:01 pm

Ok well I'm haivng a lot of trouble getting the controller to work. I did the one from the book with tact switches and stuff. I know you guys can't help much, but other than checking for loose/bad connections, is there anything else I can do? Also, Tim ordered me some 4021 chips that are iffy if they're the right thing.

They're from Digikey, product number 497-1352-5-ND
They're an "IC 8STAGE SHIFT REGISTER 16 DIP"
The MFG Part Number is HCF 4021BEY

The chip has this on it:

Code: Select all

  
___________
  HCF4021BE
) W99020341
  MALAYSIA

Are these the right chips? Or do I need to go looking for other ones and replace it?

Post by **CronoTriggerfan** » Sun Apr 23, 2006 6:15 pm

Make sure your chip isn't flipped the wrong way. That's happened to me before.

CTFan

sc1103 · Post by **sc1103** » Sun Apr 23, 2006 8:09 pm

I tired these twice using the perfboard, but I couldn't get them to work...check for solder bridging connections you do NOT want to be fromed. If not, I might be able to etch you a pair if I ever get around to finishing my design. I've done the schematics with EAGLE, but I am having trouble designing the physical boards.

legoboy · Post by **legoboy** » Mon Apr 24, 2006 1:04 pm

Check the wires. The first time I put my controller together, I had it wired incorrectly.

Kurt_ · Post by **Kurt_** » Mon Apr 24, 2006 2:52 pm

But could somebody with experience please look into the chip and check if it's the right one? If THAT'S the problem...

Klefmung · Post by **Klefmung** » Mon Apr 24, 2006 3:01 pm

The correct number for the 4021 would be 296-2040-5-ND. It is on the mistakes (or whatever you call it) page of the book page and it suggests you get those instead of wasting NES controllers.

Kurt_ · Post by **Kurt_** » Mon Apr 24, 2006 4:12 pm

But would the ones i have RIGHT NOW work? If not i'll order me up some of those. But I'd rather knowt hat mine work. Meanwhile, I'll check the rest of my connections (found 2 already) and keep trying.

Klefmung · Post by **Klefmung** » Tue Apr 25, 2006 8:48 pm

I seriously doubt that some random part from out of the blue will work.

Weebl · Post by **Weebl** » Tue Apr 25, 2006 8:53 pm

I'm pretty sure that's the correct one. Since the part number is 4021, that IC number is universal no matter what company makes it. Since it also says IC 8STAGE SHIFT REGISTER 16 DIP, that leads me to believe that its the correct part. However, if you rewire everything again and it still doesn't work, you might want to find different IC's.

timmeh87 · Post by **timmeh87** » Tue Apr 25, 2006 9:53 pm

im pretty sure they are the right chips.