Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
tggzzz:
--- Quote from: Specmaster on May 06, 2018, 10:32:00 am ---
--- Quote from: bd139 on May 06, 2018, 10:21:34 am ---Yep I’ve got TTL coming out of my ears that I skip dived off an old employer.
Disclaimer: I sold all the good stuff on eBay already (74181s etc) :D
--- End quote ---
And I thought it was wax [emoji23] lovely day here at Old Warden with the spitfires and hurricanes parked up in front of me literally 50 feet away.
From mobile device so predictive text might have struck again [emoji83]
--- End quote ---
I'm sure it is lovely there, providing your mind as well as your body is there.
Sent from a real computer, so I can't pretend mistakes are "because the computer did it".
Ero-Shan:
--- Quote from: bd139 on May 06, 2018, 10:21:34 am ---Yep I’ve got TTL coming out of my ears that I skip dived off an old employer.
Disclaimer: I sold all the good stuff on eBay already (74181s etc) :D
--- End quote ---
Just like me. But I never had '181's (or a need for them). I was puzzled, however, that I do not even have a single of the once ubiquitous 7490's. I'm sure I played with them 40 years ago. And I don't throw things away lightheartedly. ;D
While I was cycling, I had an idea (and some nasty headwind). Remember those two Nordmende DIVO 3362 of several days ago? One of them I decided not to waste my time on repairs. As they are the same vintage as the PM2421, I took a closer look at the schematics. Especially at the comparator. It bears the ominous name "SN72710", and the pin numbers and circuitry around it look eerily familiar now. ;) Maybe it wasn't so bad winning both auctions!
If only I had holidays 'til my retirement. 8)
mnementh:
--- Quote from: Ero-Shan on May 06, 2018, 08:19:37 am ---
--- Quote from: bd139 on May 06, 2018, 07:58:43 am ---You win some, you lose some. I had to scrap a HP 54602B scope a while ago. Don’t give up yet though. From even the worst turds we gain experience, even if it results in a few grey hairs too :-+
Philips are one of those strange companies. The electrical designs are very very good but the mechanical designs are designed by the electrical engineers I’m sure because they’re rubbish. Oh we’ll just stick the current shunt between some bits of plastic on the front panel. Oh the front panel has melted (been there).
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I don't give up easily! Not on this one! While there are very few special parts (like the "Photochopper" and that fuse resistor), lots of the ordinary parts aren't easy to come by today. I have thousands of TTL ICs, but only a few of those used in this instrument. And they can't be bought any more. :(
Failure is not an option. But a likely outcome ...
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[Random Mode]
“Maxim 70: Failure is not an option. It is mandatory. The option is whether or not to let failure be the last thing you do."
― Howard Tayler, The Seventy Maxims of Maximally Effective Mercenaries
mnem
“No battle plan ever survives first contact with the enemy.” - Helmuth von Moltke
[/Random Mode]
Cerebus:
--- Quote from: Lu-Tze(via TP) ---Do not act incautiously when confronting little bald wrinkly smiling men!
--- End quote ---
bd139:
Slacking sunday - not. After much dicking around I decided to do an LCR meter properly and design a PCB and get it made up. Mainly because codeine for foot injury + manually routing board by hand on paper turned into something Dali would have come up with.
Schematic capture done. Now to fuck around trying to spend 9 hours entering footprints for latching changeover switches and working out how to cram it all in a Hammond 1599.
Step 1 ...
Parts are chosen for economy not necessarily optimum for the job :)
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