Author Topic: Delete this thread please! (Read 5831 times)

Falcon69 · « **on:** March 20, 2017, 01:06:11 am »

Delete This Thread Please.

Don't buy surplus junk to resell, FYI. It can't be resold, except to another sucker.

xrunner · « **Reply #1 on:** March 20, 2017, 01:09:48 am »

Wow what a steal! Did you get a range of SMD sizes?

Falcon69 · « **Reply #2 on:** March 20, 2017, 01:33:07 am »

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rrinker · « **Reply #3 on:** March 20, 2017, 06:22:48 pm »

Now why can't we have places like that in this part of the country?

Be sure to post some stuff here, at least the stuff you want to get rid of. I'm sure there are plenty of people who would help you reduce inventory. Depends on what you have, but I may need some older DIP ICs in the not too distant future And a reel of 10K SMD resistors would make resistor wheelsets for my trains for life.

Falcon69 · « **Reply #4 on:** March 21, 2017, 01:21:40 am »

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Falcon69 · « **Reply #5 on:** March 21, 2017, 02:11:04 am »

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rrinker · « **Reply #6 on:** March 21, 2017, 01:35:29 pm »

Quote from: Falcon69 on March 21, 2017, 01:21:40 am

I am currently looking at everything and getting a count (roughly, I'm not unwinding every reel and counting, of course), and then making an excel spreadsheet on it all. But, this will take me lots of time. The one box with mixed ic's wrapped in static bags is taking forever. there are over 600 baggies in that one box. Some chips I can't even find them on FindChips.com. So, I just bag those up seperately with a label with the numbers on the chip. All I can do I guess. They are probably custom made chips for tektronics are intel that they were using. So those I will probably never be able to get rid of, as I don't know what they are.

I guess it depends on what Tektronics chips those are - there's certainly plenty of people on here repairing old Tek equipment and some of that custom stuff seems to be pretty close to unobtanium. You may find yourself the best friend of every Tek repair junkie on the forum.

Cubdriver · « **Reply #7 on:** March 21, 2017, 05:38:16 pm »

Quote from: rrinker on March 21, 2017, 01:35:29 pm

Quote from: Falcon69 on March 21, 2017, 01:21:40 am
I am currently looking at everything and getting a count (roughly, I'm not unwinding every reel and counting, of course), and then making an excel spreadsheet on it all. But, this will take me lots of time. The one box with mixed ic's wrapped in static bags is taking forever. there are over 600 baggies in that one box. Some chips I can't even find them on FindChips.com. So, I just bag those up seperately with a label with the numbers on the chip. All I can do I guess. They are probably custom made chips for tektronics are intel that they were using. So those I will probably never be able to get rid of, as I don't know what they are.

I guess it depends on what Tektronics chips those are - there's certainly plenty of people on here repairing old Tek equipment and some of that custom stuff seems to be pretty close to unobtanium. You may find yourself the best friend of every Tek repair junkie on the forum.

^^^ This!

-Pat

SeanB · « **Reply #8 on:** March 21, 2017, 07:12:58 pm »

Make a list of those IC's and put it here, you will get a very quick cross reference on them and can decide on how to sell them then.

Falcon69 · « **Reply #9 on:** March 21, 2017, 08:29:28 pm »

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Falcon69 · « **Reply #10 on:** March 23, 2017, 07:21:42 am »

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capt bullshot · « **Reply #11 on:** March 23, 2017, 07:41:58 am »

Quote from: Falcon69 on March 21, 2017, 08:29:28 pm

Anyway, here is a pic of just some of the chips I'm trying to deal with. They have little printed up label on each chip with numbers. (stock chip numbers imprinted underneath them).

The DIP packaged chips look like OTP PLA / PALs, the PLCC might be something alike - pretty much useless, except as an replacement for exactly that board that they were programmed for, or maybe a collectors item.

Falcon69 · « **Reply #12 on:** March 23, 2017, 07:52:46 am »

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capt bullshot · « **Reply #13 on:** March 23, 2017, 11:58:49 am »

Quote from: Falcon69 on March 23, 2017, 07:52:46 am

So does that mean that I can probably Assume that any Pal or PLL, or programmable chips I find in that box, will probably be useless, even if they have no label on the chip itself, since the package (static Bag) has a number on it? The chips can't be deleted and reprogrammed?

Most of the vintage programmable chips are OTP. Erasable ones have that window which lets you see the actual chip. Programmed chips would be usually marked on the package, either by a sticky label or some colored dots. If the package is completely unmarked other than the original manufacturers part number, it might be something else and useful.

Kjelt · « **Reply #14 on:** March 23, 2017, 01:48:32 pm »

I also have a lot of reels with passives collected over the years. Too much for me alone and I was thinking about a board on this forum where all members would list their surplus inventory so other hobbieists could buy or trade some stuff.
The biggest problem I could see are the huge shipping costs, unless local or europe only they are much higher than the price of the components, which renders the idea useless.
If only we would have the same low shipping rates as China then we could easily pull this off, same for Ebay, only bigger amounts of components would be worthwhile if you have to ship them to another continent.

Falcon69 · « **Reply #15 on:** March 27, 2017, 04:06:49 pm »

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wraper · « **Reply #16 on:** March 27, 2017, 04:17:00 pm »

Quote from: Falcon69 on March 20, 2017, 01:33:07 am

No, they didn't have the IC Chips on Reels. These were in static shielded bags, consisting of 1-20 loose IC Chips.

Having myself a lot of parts, then it's was not worth it IMO. You can get a full reel of resistors for about $2.30 for something like Yageo or Royal Ohm, $3 for more fancy Vishay, capacitors for $4+ (Samsung). New and lead free. And you will have exactly what you need. Without 95% of parts which won't be anything more than paperweight.
That's a big space waster, and time waster to sort them, track what you have and find later.

Falcon69 · « **Reply #17 on:** March 27, 2017, 04:51:42 pm »

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Ian.M · « **Reply #18 on:** March 27, 2017, 06:57:31 pm »

Yes that should work. Calculate the area of the outer diameter by Pi*d²/4, subtract the area of the inner diameter, then divide by pitch*thickness. As most reels will be standard sizes and pitches, you can have a lookup table for those so will only have to enter the reel type, tape thickness and outer diameter.

Falcon69 · « **Reply #19 on:** April 03, 2017, 09:11:25 pm »

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Falcon69 · « **Reply #20 on:** April 08, 2017, 06:52:46 pm »

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Kjelt · « **Reply #21 on:** April 09, 2017, 09:22:38 pm »

Also note date of manufacture.
I also buy some reels some time from an smt assembly facility.
Most components can not be used in production after a couple of years, the leads are not within spec anymore to risk going into mass production so they toss them.
So if you sell them it will be to hobbieists only, no serious production facility will touch them.

Falcon69 · « **Reply #22 on:** April 10, 2017, 03:33:15 am »

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Kjelt · « **Reply #23 on:** April 10, 2017, 09:15:20 am »

It is all about reflowability, example if you have 0603 resistors/caps that are 8 years old, the contacts could be oxydized in such a way that you could get tombstoning.
The same with other stuff in production, such as reflow paste, although it probably is still good it will be tossed away if the date has passed.


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Author Topic: Delete this thread please! (Read 5831 times)

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