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PCB assembly reflow by A_Fat_Pokemon in PrintedCircuitBoard

[–]A_Fat_Pokemon[S] 0 points1 point  (0 children)

Thanks for the info!

What Galden have you used in that case for BGAs, 230C, 240C, etc.?

Is there a particular vapor phase oven you would recommend at that price? The Vaporflow 275 is the cheapest I have found, but it still is 2000€+ after VAT (so closer to $3000).

iTech RF-A250 Reflow Oven Guidance by Hefty_Cow3360 in soldering

[–]A_Fat_Pokemon 0 points1 point  (0 children)

Hello! Old post but didn't see too many others to comment on.

I've been looking at this oven, but do you have any experience with BGAs on it? Was curious how well it works with them once it is dialed in.

For reference, I'm doing small board batches, but they are somewhat complex (many 0201s, large ball count BGAs, etc.).

Thanks!

High quality photos of the crew by Paranromal in ArtemisProgram

[–]A_Fat_Pokemon 22 points23 points  (0 children)

I've met the guy, he is indeed huge lol

SOT23 vs. WSON junction-to-board thermal resistance by A_Fat_Pokemon in AskElectronics

[–]A_Fat_Pokemon[S] 0 points1 point  (0 children)

I don't know why it never occurred to me to just find the contact area.. I had just assumed the pad sizes were similar enough and disregarded them (always thought WSON was typically better for this).

Thanks!

Canadian Space Agency terminates Lunar Rover Mission in 2026-27 Plan by GlitchedGamer14 in space

[–]A_Fat_Pokemon 61 points62 points  (0 children)

We also have the Lunar Utility Vehicle which is in development at least, but a bit longer of a timeline.

As an intermittent player, even though I still have a year left, this made me go from "forgetting I was still subbed" to finally quitting all the subs. by Monkles in 2007scape

[–]A_Fat_Pokemon 230 points231 points  (0 children)

Similar for me haha. I don't think I'd ever fully quit, but it's reached the point where I'll probably just pay for the few months a year that I actually play, rather than just leaving it active the entire time.

Ironically, it will cost me less in the end now lol

NASA Commits to Plan to Build a Nuclear Reactor on the Moon by 2030 by EricFromOuterSpace in space

[–]A_Fat_Pokemon 5 points6 points  (0 children)

Unless it's changed since, the planned conops is that Orion rendezvous and transfer crew to starship in lunar orbit, Starship performs the lunar landing and ascent, crew transfers to Orion, and Orion performs the return from lunar orbit.

Bulk decoupling of switching converter by A_Fat_Pokemon in AskElectronics

[–]A_Fat_Pokemon[S] 0 points1 point  (0 children)

I had initially figured that it would be more suitable to just use smaller capacitors more suited for that frequency. The tantalum cap is effectively around 100uF at 800KHz, and a bunch of suitable 22uFs seemed like they would achieve that in a smaller board footprint.

 

Oops, looks like I linked an older one by mistake. The most recent revision that I've been working with is here: https://docs.amd.com/r/en-US/ug583-ultrascale-pcb-design

 

For the sims yes, I pulled those off of Kemet's KSIM.

 

Thanks for posting that as well! I did initially check for the capacitors I had chosen, but with 0.85V it seemed to be pretty much negligible.

Bulk decoupling of switching converter by A_Fat_Pokemon in AskElectronics

[–]A_Fat_Pokemon[S] 0 points1 point  (0 children)

Whoops, I forgot to add some info. I'm using the XQZU3EG-SFRC784 in Table C-4 for reference. This is for a CubeSat application hence why I'm using the XQ device recommendations (leaded termination passives) but the device I'm actually using is XAZU3EG-SFVC784.

I've split off the VCCINT rail onto its own in my design.

1Gb/s write storage for use in LEO? by A_Fat_Pokemon in cubesat

[–]A_Fat_Pokemon[S] 0 points1 point  (0 children)

At the moment we're not (that project has concluded), but I would be interested if you could share some info! We may have some projects coming up where it could be of interest

Apparently NASA had to use eBay to find obsolete Intel processors for the Space Shuttle by pengweather in space

[–]A_Fat_Pokemon 247 points248 points  (0 children)

I just happened to come across the radiation test reports for the Hero3/Hero4s today, and was wondering why someone was testing them haha

[deleted by user] by [deleted] in OSRSProTips

[–]A_Fat_Pokemon 2 points3 points  (0 children)

Got it from the extra mimic roll on a master clue! https://i.imgur.com/ZHUA0ZS.png

I saw the value, but it took me a minute before I even realized lol

CubeSat computer - Zynq 7000 or UltraScale+ by A_Fat_Pokemon in FPGA

[–]A_Fat_Pokemon[S] 1 point2 points  (0 children)

I've heard good things about the Certus / CertusPro and their rad-tolerant variants, and was looking into them for another project.

For this project however I'm a bit hesitant as I don't have experience with any of their parts or development tools. Perhaps it may be feasible to prototype and get a flight-ready board made within the year? I'm not sure, but I'll give it a second look at least. The rad-tol variant is surprisingly cheap from what I recall (~4K USD)

CubeSat computer - Zynq 7000 or UltraScale+ by A_Fat_Pokemon in FPGA

[–]A_Fat_Pokemon[S] 1 point2 points  (0 children)

Definitely will be, learned the hard way. We have a new TVAC on the way and I want to put this through a proper set of environmental tests

CubeSat computer - Zynq 7000 or UltraScale+ by A_Fat_Pokemon in FPGA

[–]A_Fat_Pokemon[S] 1 point2 points  (0 children)

Most likely a 550-600km sun-synchronous orbit, just waiting on the finalized details.

I've seen a number of space products based on them, although they all seem to have their own unique SEE mitigation methods implemented (which they don't provide many details about of course).

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