Tom Fleet

Laying out any project featuring a USART serial port.

@will_whang Interesting placement. Something in ECG territory? That or a morse keyer lol - curious as to what this thing is with that form factor!

such a dumb board but I haven't worked with pure analog circuits for a long time.

@elecman213 @blind_via 7 if you count the 3 axis accelerometer as a set of low rate channels.

@blind_via There are 4 mics inside a smart phone

The cell phone PCB has 2 microphones instead of one.

@stevenson408 @blind_via I'd go with your take. Seems correct to me.

@blind_via The ic nearby those 2, im guessing is audio amp for the headphones

The big boy PCB shield cans mean business. Had to crank the hot plate temp and the hot air temp. Lot of thermal mass even for this tiny board

@blind_via @AndrewBean Part of the issue of why temp control is important as hell here, along with the air speed on the hot air tool. I know you're just doing a teardown here, but there's a lot to be said for technique in doing this without knocking parts about off pads!

@AndrewBean I agree with that, there is another tall part in the bottom right of this image that also has a region left open

@lukebayes That looks kinda rough, were they delivered loose in a bag or something?!

These are the tips of my ceramic tweezers. That little bastard on the bottom is a 0.6mm RGB LED! Parts be getting smol! The datasheet says one of those gold pads has a chamfer on the inside corner to indicate pin 1. I think they lied.

@plopesresearch I like ordering from DK either side of summer, because the labels seem to bond to the bags a bit less, and you can move the label to your parts storage, and get a nice clean blue ESD bag for later use lol

@plopesresearch cut package and tape? just grab yourself one of the bluetooth barcode printers off aliexpress - I'm sure that's gotta be easy enough to frig up to a serial port / send a custom string to over bluetooth, right? aliexpress.com/item/100500988…

Not sure why I've never thought to look into the APIs for DigiKey. like, what do you mean there's been a barcode lookup available for me to use all this time. Seems preferable to having to take a photo to pass to Google Image OCR, to pass into a google search.

@blind_via Bottom room looks a lot like it's the RF/TX switching for driving / listening to the antenna? Where is that on the board? Are there Antenna contacts on the other side of that area of the board perahps?

Radio PCB circuit spotted, that break in the room walls allows a trace to go from one room to the other. That is the main RF from the upper IC down to lower room, likely filtering but possibly amplification. it appears go internal after that, as I don't see an antenna contact in this room.

@will_whang Very fun parts, btw, for when you kinda don't reallllly know what you need to do, Analog wise, or, need reconfigureable analog I/O. Did a lovely ATE design based on these things. Not cheap, but cool.

@will_whang 20 Channels, eh... And, don't AD now own Maxim? Smells kinda a lot like a PIXI part, something platformed from the MAX11300, maybe? analog.com/en/products/ma…

They definitely purposely designed this chip for the water cooling AI servers, damm is the shipping volume that high that AD is willing to create a whole new chip?

@mishkathebear @seveibar But it'd be nice if the guys trtying to force AI on this space spent a little time learning the underlying engineering behind it, Even at the level I've just shown there of utterly basic reading up on *their* stack.

@mishkathebear @seveibar It seems like the equivalent to LoRA for image gen would be appropriate. A general selection of corpus for RF/High Speed/Power, with device specifics passed via LoRA in the same way you'd tune an image gen stack.

GPT 5.6 Sol (medium) vs RP2350 design, directly inside ChatGPT

@mishkathebear @seveibar The datasheet isn't even the entire amount of data that needs to be processed to design a part in successfully.

@tomfleet @seveibar Datasheets are huge, so models are suffering from context saturation. Another reason is understanding semantics of numbers and operations on them. IMHO both issues are solvable, and (in this domain) can be easily trained with some help of tooling.

@campedersen @ADCs934 @seveibar no, of course not. where did I say that. I said it's good to understand the specific problem(s) and constraints that you are choosing to engage with.

@tomfleet @ADCs934 @seveibar whats your point, we should stop writing software?

@campedersen @ADCs934 @seveibar things like TopoR have been about for a long, long ol' time, and they still understand the problem task well enough initially to do a better job of what's thrown at them IMO.

@ADCs934 @seveibar how does your autorouter do?

@Michaelskywal @seveibar You'd have thought they might have at least let Grok fix up Twitter, or figure out what "spam" looks like, but here we are, right.

@seveibar Very gross, I have been hoping that SpaceXAI would be the masters of physical AI with all the training data they have, but they are still bad at it as well.

@seveibar bruh

@tomfleet maybe not YOUR crystals

@TNKS1406 sharing it with who? anyone who wishes to understand the circuit? anyone who reads it, will infer that there is a design error - until they check the board for discrepancy. if the schematic is going to be visually incorrect, do not bother to generate it, it is a waste of time!

@tomfleet ネットリストでは整合してるので、AIに引かせた前提で気にしないようにしてます。AI運用基板設計においてら、回路図は設計意図の共有としてしか見ないようにしてます。

うちのAIくんはそこそこ良い回路図を出してくれる　理由は不明

@pottkopf @seveibar Hey now. 2010's (and all previous autorouters) knew about ground planes.

@tomfleet @seveibar I just love that we still havent evolved from 2010's autorouters. Still using the minimum trace width for everything is just wild.