General > General Technical Chat
Thousands of old ICs
jord4231:
May not be all bad news, there is a lot stuck in to the foil foam stuff too.
I'm not really looking to sell them just too much effort plus I'd hate to sell some one a dud.
The real win for me was loads of motorola power transistors and believe it or not I've had some use of some of the ics already, had everything I needed to build the Carlsons curve tracer recently that was a win :) Plus I'll never ever have to buy another th resistor :-DD
calexanian:
Fun if you have the room. Also good fodder for ham swap meets or elecronics flea markets. Realistically though apart from analog stuff there are about 20 or so logic chips that are still useful for hobby type stuff. The vast majority of them however were so esoteric that it would be hard to find uses for them these days. If it were me, I might be tempted to pull out the ones that might be handy one day. Keep a couple of samples of each of the rest on that odd chance you need one for a repair or experiment, then sell the rest off on ebay or something.
bob91343:
A couple of years ago I picked up a box of electronics parts from Craigslist, free. There were plastic bags full of resistors, mostly, quite a few capacitors, and over 5000 1N4148 diodes. The only 'bad' parts were some resistors, mostly 220 Ohms that were all over the place in resistance. I threw out a few hundred of those; I don't know if they were mismarked or have changed value, although they look new.
Every once in a while I poke through the box to refresh my memory of what's there. I even use some of the parts to clip off leads to get some short pieces of wire.
Of course the fun of playing with this stuff outweighs the trouble. Some of the values are not standard, like some bags of 9 Ohm resistors and other strange stuff. The resistors are mostly 1/4 Watt size.
rsjsouza:
That is an interesting collection; I still have gobs of plain TTL parts from our early days of hobby eletronics and from various brands and countries of origin (El Salvador, Portugal, Brazil, Italy, Spain) - datecodes starting from 1971.
Regarding ESD, the plain TTL devices are so robust that we never had issues with them stored in similar drawers. The oldest CD4000 parts, however, were another story: the pre-B variants of these parts had no protection diodes and blew quite easily. We wrapped them in aluminum foil.
Have fun!
jfiresto:
--- Quote from: rsjsouza on April 20, 2020, 07:15:07 pm ---... Regarding ESD, the plain TTL devices are so robust that we never had issues with them stored in similar drawers. The oldest CD4000 parts, however, were another story: the pre-B variants of these parts had no protection diodes and blew quite easily. We wrapped them in aluminum foil....
--- End quote ---
4000 series CMOS always had ESD protection networks; B-series added more buffer transistors to improve their gain. Something was not right with your ESD handling or storage or both if you were losing parts.
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