Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
bsdphk:
It was very common for coax cables to also have one or more bundles of twisted pair.
Some of the pairs were used for order-wires and remote diagnostics on repeaters in manholes, but carrier terminals were expensive and you didn't want to re-modulate too many times, so the rest of the bundle were used for traffic.
Since it was very common for long coax to pop into smaller, non-carrier, exchanges for the repeaters to be powered from their batteries, the copper pairs were then connect these minor exchanges with the next carrier terminal up or down the coax-cable, or simply as toll-lines to the neighboring exchanges.
Here is a picture of AT&T's L4 cable, from first half of 1960'ies, that is roughly the same vintage:
https://archive.org/details/bstj48-4-1065/page/n3/mode/2up
(That entire issue is about the L4 system, there is a similar issue about L3 about a decade earlier)
Vince:
COMPONENT SORTING
--- Quote ---
OK so now that the easy stuff is done, I can start digging into the second drawer of IC's.... this time random tubes of IC's and also some new components bought in the recent years, but I of course long forgot what all that is. That will be much more fun as I have no idea what's in there, it's gonna be a surprise.
--- End quote ---
A day later... that drawer has now been processed, here is the resulting spreadsheet.
So at last some interesting stuff... not just transistors and TTL logic chips.
Problem that's torturing me is how to categorize some, many, chips that fall into 2 if not 3 different categories... I am torn. It's bordering arbitrary.
Like the AD552.. a digital potentiometer. A pot is linear stuff, analog... but it's meant to be driven by digital signal. So do I put it in the " CPU peripheral " or in the " Linear ", or " interface" categories ?
And the ULN2003 chip... it contains an array of 8 Darlingtons. So it should be in the transistor category but... the Darlingtons are not really usable independently. All the emitters are common. Also they have a built-in freewheeling diode that all share a common anode. Also, these Darlingtons have a couple resistors around them, so as to fine tuned them because their bases are meant to be driven by logic chips. So again, do I consider it a CPU peripheral, a transistor, or a driver/interface chip... and it's like that for most chips ! :palm:
So for some of these chips it's really a bit arbitrary :(
Have only one single comparator though, and surface mount as well, a 393. So I guess I really ought to by a few different comparator types, in DIL packages...
Have some SMALL MOSFET, TO92 package, that's nice.
One single 555 timer.... need a few more for sure >:D
Some 4000 logic chips, good, because I had only 4 different types so far. Have a bit more now, it's more useful...
AVGresponding:
--- Quote from: Vince on June 27, 2022, 08:37:41 am ---Morning here, doing my first check of leboncoin.fr ads, and saw that :
https://www.leboncoin.fr/bricolage/2182739080.htm
Apparently posted last night at 21H14min
A cool Tektronix DMM 916, looks well featured, for only 20 Euros.
Guy says it reads current OK but all other modes are defective and the display is stuck reading : " Probes ".
Sounds like something that could be fixed... or at least well worth a shot at only 20 Euros.
Sadly like anything worth anything on this website, it's already sold, I am too late ! |O
Not that I could have bought it anyway, but still...
So really that goes to show there are sometimes decent stuff out there... but you need to run your searches every 5 minutes day and night, never sleep, never work, never eat/cook, never go to the toilets, never go out to buy groceries... no, you need to be 24/7 on the site running your searches/keywords constantly. I can't do that, I am not a robot :--
--- End quote ---
Shame you missed it, they are very nice meters, and at the price was too good to pass.
Vince:
Yeah but no regret, weil I mean, in the sense that as I said earlier, zero money right now, even for food, as in zero money, not even 20 Euros (plus shipping as well...). So I could not have bought it anyway :-//
Another one will pop up later, in a year or 3.. but I will have one 8)
Ice-Tea:
SR510. Works, except for the LCD which displays bogus (analog meter is stable).
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