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| Test Equipment Anonymous (TEA) group therapy thread |
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| Cubdriver:
--- Quote from: cyclin_al on July 22, 2022, 01:50:09 am --- --- Quote from: Kosmic on July 21, 2022, 03:15:02 pm ---Cheap (65$) Tek p6046 differential probe on ebay. Working order and with all accessories. I would go for it, but already have one. https://www.ebay.com/itm/185500027746 --- End quote --- ... and it is already sold >:( --- End quote --- Sorry. :-// The auction ended this afternoon at 1:00, and I fully expected to be outbid on it; was surprised when no one else took a crack at it and the notification came in from the bay. -Pat |
| Cubdriver:
--- Quote from: cyclin_al on July 22, 2022, 02:08:07 am --- --- Quote from: Cubdriver on July 21, 2022, 06:52:43 pm --- --- Quote from: Specmaster on July 21, 2022, 06:47:23 pm --- --- Quote from: bd139 on July 21, 2022, 05:32:34 pm --- --- Quote from: Specmaster on July 21, 2022, 05:29:22 pm --- --- Quote from: bd139 on July 21, 2022, 04:31:21 pm ---Oh those bloody posts do my head in. They installed them on the road with the local hospital which means ambulances take 10x as long to traverse it. On top of that it’s so narrow you can’t get two busses past each other now. Total fail. --- End quote --- What posts are these then, would they be posts to mark out the bleeding cyclists lane from vehicles? --- End quote --- Yep: https://goo.gl/maps/cg187YUyaSTvgEnc6 --- End quote --- We have the same bleeding shit here, and like you the Hospital with the A&E dept is on the same road FFS. Ambulances struggle to get through the traffic and to add insult to injury, there are bus stops along the route and most of those were in layby's, now they are in the road and block the road completely. --- End quote --- It's nice to know that those who design these things carefully think them through and consider the possible worst-case scenarios, isn't it? ::) ::) ::) ::) -Pat --- End quote --- Yes, it must take some effort to always successfully achieve the worst case scenario. I hate the things also. And yes, I am a cyclist. They may help slightly in protecting cyclists in long straight sections, but the spacing is always so tight that anything crossing the cycle path becomes a compressed high-stress conflict zone. Driveways, intersections and turning lanes all get worse. As already said, clearing the roadway for emergency vehicles or a breakdown lead to chaos among the posts. I also drive a truck. My mirrors are high enough and large enough to extend OVER the posts. Other cyclists who believe the posts are magical and it is okay to ride right up beside the post may be in for a rude surprise... --- End quote --- It never ceases to amaze me how those in power can manage to consistently fuck things up in ways that Stevie Wonder could see coming from a mile away at the witching hour on a moonless night with pea soup fog. All too many of them seem to have this amazing ability. -Pat |
| mnementh:
--- Quote from: mnementh on July 20, 2022, 03:42:19 am ---WARNING: HP 54621D to 54600A MONITOR HACKAGE MEGA-POST! And so now, here I am with the results of my little "poke around the 54621D mainboard"... Comparison of monitor cable pinouts of 54621D vs 54645A/54600A. This is the pinout of the J900 connector ribbon cable AT THE MONITOR. As we can see, they did not repurpose the BRIGHTNESS pins; they just circumvented them, then shunted pin 12 to ground through a 10K resistor. The only video is the ~0.7V P-P signal at pin 11. I drew out the circuit of Q960-961, thinking there might be some mixing going on in there, but nothing I could find coming from anywhere but the MegaZoom ASIC. And I'm guessing that the "additional information" I thought I say on the VSync was just a byproduct of both signals being generated in U411, a Quad OR Gate. This is Q960-Q961 in the video out to J900-Pin 11 on the 54621D. Q961 base goes to the Megazoom IC through a 50Ω resistor. Q960 Emitter goes to J900 pin 11. @factory: Based on this, I'm guessing your surmise that the only real difference between the two is that 74S03 vs the transistor amplifier on the neck board was dead on... but that makes this a bit of a bastard monitor with that weird HSync frequency. Yes, of course I tried connecting it to a VGA monitor, but all the ones I have are relatively modern, and while they do see the signal if both HSync and VSync are present, all I get is "Mode Not Supported". Maybe if I had some prehistoric analog unit, or the scan converter Robert was talking about, yeah. Or maybe it would sync, but the video would be out to lunch. :-// At this point I'm inclined to try and figure out the differences between the two neck boards next. Maybe try and ghetto-fab something just for gits & shiggles. >:D mnem *toddles off to ded* :=\ --- End quote --- So this evening I decided to try and fake out one of my monitors to make it sync on this bastard VGA signal by building a pulse with my little PWM generator to mimic the duty cycle and amplitude of the orignal HSync from the 54621D, but at a frequency the monitor might actually try to display. Doubling that frequency got me to this point; good proof of concept but not enough granularity in the adjustment on my little $3 Chinesium generator to actually get it more legible than this. By fiddling with the symmetry on my old ProTek analog function generator, I was able to get the duty cycle low enough that the monitor almost locked onto the signal; well, close enough to get these pics and see what it is actually saying. Now that I know why this scope became a monitor PCB donor, I'm actually even more pissed off than I was before at those fucking g'rillas... :rant: mnem |
| cyclin_al:
--- Quote from: Cerebus on July 22, 2022, 01:27:04 am ---This was both entertaining, and informative. Do the Knipex pliers win? --- End quote --- Yes, Knipex wins if you compare the ratio of force to cut the sample nail and the force at failure. You have a reasonable margin and are unlikely to ever break the Knipex in normal use. Milwaukee was pretty good too. The pliers from 1970 were very strong, but the force of use on the sample nail was approaching the force of failure, leaving not so much margin. EDIT: We need to stop! My tool boxes are getting loaded up with various sets of very nice pliers. That leaves not a lot left in the budget for TEA (though I tell SWMBO that the pliers are part of the house repairs and are saving money by not hiring contractors, it still means I have no money left) |
| cyclin_al:
--- Quote from: Cubdriver on July 22, 2022, 02:38:51 am --- --- Quote from: cyclin_al on July 22, 2022, 01:50:09 am --- --- Quote from: Kosmic on July 21, 2022, 03:15:02 pm ---Cheap (65$) Tek p6046 differential probe on ebay. Working order and with all accessories. I would go for it, but already have one. https://www.ebay.com/itm/185500027746 --- End quote --- ... and it is already sold >:( --- End quote --- Sorry. :-// The auction ended this afternoon at 1:00, and I fully expected to be outbid on it; was surprised when no one else took a crack at it and the notification came in from the bay. -Pat --- End quote --- Good to see it went to a good home. No offence taken! Honestly, there is no possible chance I would have seen it by 1:00 in the applicable time zone, so I would have missed it anyway. |
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