Sources for parts (Solved)

EDIT: I no longer need a specific IC. The intent of my post was for "Sources for parts" in general, not for any specific part. Though I was assisted in realizing I didn't actually need one that I mentioned and that is appreciated. It looks like Ebay and Amazon will continue to be my go-to resources for now.

Hello. First post and hopefully I have it in the correct area. Can you all share sources for parts like ICs and such that don't require a loan? Back in the day there was Radio Shack and you could run there and grab a 7805 or a 74ls00 for pretty cheap. I've been looking for a 74ls32 online and, gasp! they are asking for over $5 and then wanting $8 or more for shipping! I have found some that aren't too bad but they come from China and take a month to ship. I'm seriously considering going to DeVry and giving one of the students $20 and asking for an assortment of parts from their lab. I am a DeVry grad so this shouldn't be too out of line, but...
So, can anyone share a source of reasonable ICs , resistors, and other components

JoeWillson:
Hello. First post and hopefully I have it in the correct area. Can you all share sources for parts like ICs and such that don't require a loan? Back in the day there was Radio Shack and you could run there and grab a 7805 or a 74ls00 for pretty cheap. I've been looking for a 74ls32 online and, gasp! they are asking for over $5 and then wanting $8 or more for shipping! I have found some that aren't too bad but they come from China and take a month to ship. I'm seriously considering going to DeVry and giving one of the students $20 and asking for an assortment of parts from their lab. I am a DeVry grad so this shouldn't be too out of line, but...
So, can anyone share a source of reasonable ICs , resistors, and other components

Such things are antiques, and haven't been made in decades. Look for something newer and change to SMD.

Paul

That is expensive because it is an exotic discontinued component and you are getting NOS parts for people who are fixing old equipment and can't change to a different part.

Use parts in current production. If they are china-only or you want an assortment pack of passives or variety pack of transistors or common hobby ICs, get on ebay/aliexpress (this is also often cheaper for reels of smd LEDs or common passives), if it's something from a mainstream manufacturer, digikey, mouser, or farnell (which is better depends where you're located)

The 74LS32 - as with nearly all of the 74LS series - is simply obsolete.

Its direct replacement, the 74HCT32 - is catalogued at less than $1 from any reputable dealer, your only problem being postage. :grinning:

Now when I say "direct replacement", I mean the part you would use to replace a 74LS32 to repair a piece of equipment which I would presume is the reason for your enquiry.

If you were designing something new, then clearly you would not require this part or if you did think for some curious reason that it would best suit your purpose, then you would use either a 74HCT32 or the more common 74HC32.

I just ordered 10 4 input OR's for $2 and $3 shipping and they will be here next week. I have quite a few through hole proto boards so I'm not going to swap to SMT for 1 IC. The "LS" was not a qualifier of my search. My search was for a quad 2 input OR gate.
Anyway, this was intended to be more about sources than part selection, but I found another post where this was recently asked and answered. Thanks

So when you say "4 input OR's", you do mean 74HC32?

They are in fact, quad 2 input ORs - but you know that. :grinning:

I went with the TC4072 which is dual 4 inputs. I was going to chain outputs to inputs to just make a 4 input if I got the 32 but this makes a cleaner board and faster switching. I'm putting 4 IR receivers (IR remote) that each have a 90 deg reception angle onto 1 input pin on the Duo. That will give 360 deg reception.

Aren't those IR sensors active low (ie, they output high unless the IR carrier is detected)?
If they are, you'd need an AND gate, since you'd want the output to be low when any input is low, high otherwise (as opposed to if they were active high, where you'd want OR gates so the output will by high when any input is high, low otherwise - which seems to be what you had in mind)

JoeWillson:
I'm putting 4 IR receivers (IR remote) that each have a 90 deg reception angle onto 1 input pin on the Duo. That will give 360 deg reception.

3-pin IR receivers are open collector with weak internal pull up.
You can just connect four recievers in parallel.
No other parts needed.
Leo..

DrAzzy:
Aren't those IR sensors active low (ie, they output high unless the IR carrier is detected)?
If they are, you'd need an AND gate, since you'd want the output to be low when any input is low, high otherwise (as opposed to if they were active high, where you'd want OR gates so the output will by high when any input is high, low otherwise - which seems to be what you had in mind)

Are they? I'll have to look at the data sheet. I thought the opposite. Thanks

Wawa:
3-pin IR receivers are open collector with weak internal pull up.
You can just connect four recievers in parallel.
No other parts needed.
Leo..

Well heck. That makes things easier. Thanks. I'll throw these on another project.

JoeWillson:
I've been looking for a 74ls32 online and, gasp! they are asking for over $5

The 74xx and 74LSxx series have been obsolete since the late '80s I think. 74HCxx is the go-to logic family these days, fast CMOS, 2 to 6V supply, good all-round performance. There are actually a dozen or so CMOS families for more specialist use (some are 3.3V only for instance), but the 74HCxx family is the most versatile and most common.

If you have to interface to existing TTL then you need the 74HCTxx family.