Hmmmm, crazy new idea for flattening response of the AKL-PT5.
Right now, I see slow peaking up to around 5-6 dB at 18 GHz, probably caused in large part by parasitic capacitance of the tip resistor.
Adding L to the signal path seems like a bad idea since it won't be co-located with the resistor (and thus there might be reflections between them).
But what about adding L to the ground path? Some preliminary circuit theory simulations (not full EM models) suggest that low single digit nH down to maybe a few hundred pH of extra L in that path (on top of the estimated 6 nH for the lead wire) could improve things a fair bit.
I just went to check a dimension on some screws that I plan to use on a current project, and when I went to view the product detail to see the drawing with dimensions, it told me I needed to be logged in to view product details.
Since when? Can anyone else confirm this?
If true, what a shitty move that erases a couple decades of good will with engineers everywhere.
@jaseg you seem to know about things, or may know someone who knows: Is there a (ideally free) gerber viewer that can display net names and/or cross probe with a schematic (e.g. with kicad)?
I'm thinking of a use case where you want to view schematic and gerber data for board debug but don't want to be connected to a license tool or opening a heavy duty program in a remote vm. (E.g. Siemens Xpedition)
@jaseg cross probing is not the primary need. Do you have the name of an open source boardview tool?
I had Googled a bit and I heard about gerber x2 format that adds properties like net names, but I dunno. Also the ipc-d-356 netlist is a thing, but I don't know of the names of tools that have the capabilities I seek.
Quick question for the #electronics side of Mastodon. What's the proper name for the small plug terminals you get on multimeters and similar equipment? Is it "banana plug socket"?
@rasterweb@hackaday I commented on your comments. I just posted it... Immediately I regret not posting my comment on my own site and linking too it. Ha.
Many years ago I published a lot of photographs under Creative Commons licenses.
And like most people who publish I have a Google Alert set up for my name, so it's always fun to see how people use the photos. (And properly attribute them to me.)
Here's the latest, which is a bowl of ping pong balls.
Shifting gears from switch power supply debugging to logic bugs in hopes of maybe making more progress there.
The symptom I'm investigating is that sometimes, for reasons currently unknown, the switch doesn't forward any packets.
Reloading the same FPGA bitstream several times usually solves it, suggesting it's not a timing bug as I had originally thought. It's likely something to do with resets or links coming up in a bad state.
I managed to get some logic analyzers on the FPGA during the failure condition and determined that frames appear to be leaving the QSGMII MAC intact, but are not being written to the QDR-II+ (the write enable on the memory controller never goes high).
This suggests something is going haywire in the CDC between the MAC clock and the fabric/RAM clock.
I want to use an #FPGA for #video. Video is 24 bits wide. Sadly all of the FPGAs I see have memory of 18 bits or 36 bits, even the companies focussed on video do that.
@PythonLinks@WillFlux 24 bits fits in 36 bit registers just fine. It's even got 12 bits of space so it doesn't feel claustrophobic. :-) What's the worry?
Hey, @drdrang . Do you think it’s unreasonable to expect a recent college graduate in mechanical engineering to know how to go about determining the size of a shaft key based on a given shaft size and torque?
@chrishuck@drdrang I think chatgpt answers the how question pretty well. It gives 9 steps with equations that look sane. It also answers that you should expect a recent grad to know this. So I'd insinuate to this engineer that possibly chat gpt could do his job better. :-)
@chrishuck@drdrang sure. I'm not an ME, and didn't vet that equation carefully, but the sense of it seemed right. The general steps seem like a good conceptual flow. And if chat gpt can lay out this map, a new-grad ME should be able to fix up the mistakes right? So even if they somehow can't do it purely from memory, I'd expect them to use a handbook or a chat gpt search and not just fail. It's like a EE failing to recall ohms law or kirchhoffs law maybe? No reason to fail, just Google it?
@timixretroplays@rasterweb i dunno guys... I tend to just use a nice quality 2x8 female header to hold the male pins in place while soldering. If you need more width or length, just solder them into a regular .1 inch through hole blank pcb. Way faster than a 3d print... but then I haven't bought a 3d printer yet.
@rasterweb@timixretroplays I hadn't read your post. Just did. I don't do large numbers of any particular soldering job, so probably I don't feel the pain you do. Nor do I generally solder so many pins, so removal force is less of an issue. For a small volume soldering job though, I like using female headers. Not having all the pins actually in a socket helps removal force stay low as well. Next time I do one I'll post photos.
One of my neighbors got tired of seeing their unused dish on the roof of their house from the second story deck, so they had a neighbor turn it into a piece of art.
(This is a venting post, please don't tell me to "just learn it" because, I will... when I find some free time.)
I was set to switch from GitHub to Codeberg, but realized there is no graphical client.
I'm a hobbyist, not a full-time software dev, and yes, I use the command line every day, but 95% of my use of GitHub has been using the GUI.
I was hoping for a quick & easy transition, but I'll need to set aside some time to read up on the CLI stuff now before I can start getting things there.
@chrishuck@rasterweb@jeramey is that the boiler that powers the "cloud machine" on Champaign? And feeds the stream tunnels all through the campus that we used to sneak into at night?
@chrishuck@rasterweb@jeramey Yup, sounds like it. I had a strong friend who would lift the conctete slabs aside so someone could go in and then put the slab back. Then the kid inside could open the hatch and we could wander through the tunnels. They were hot, fairly well lit, and you could unlatch a hatch and get out anywhere you wanted. Lots of fun writing on the walls. Very hot near the source.
CVE-2023-4911: Looney Tunables - Local Privilege Escalation in the glibc’s ld.so | Qualys Security Blog (blog.qualys.com)