The newer M-series have the RAM soldered on the board instead of removable. Typically that means they have a higher bandwidth to the RAM because of it, but you can’t upgrade to more memory. It’s an advantage if you’re running LLMs on the unit itself, but not much use otherwise.
Another fiber-seeking backhoe mishap.
That’s my impression, but if all you have to do is measure the current draw, then you don’t need the third wire. So I’ve built a basic ADC circuit to do that, but it’s pretty crude.
In the original monitor, it was quite precise, and so I traced the circuitry as above off that other wire. I don’t know enough about how all that works to replicate it and I can’t seem to find much about similar sensors to learn more.
I’ve seen the wire type MAF, but not this sort. Still can’t seem to find a datasheet on anything similiar.
I have a cheapshit cnc mill I use for PCB milling. It does the job and once you get used to it, it goes fairly quick. Challenge is getting the board to stay flat, because if the tape lets go, now your bit is digging for China, and no board starts flat. Doing a height probe is very necessary. What I like is that I just swap the bit and run it through the drill map, then I’m ready to either drive rivets or poke a piece of wire through for my vias.
But for getting a quick prototype with vias and SMD pads, I don’t think etching compares. I’ll cut boards until I’m happy with the design then send it off to JLCPCB for a production board. I’m not precious about the dust, I run it out in the shop along with every other toxic gas and dust I deal with as a farmer. I guess you could run it outside if you were concerned.