madengr

Ha ha, I call them grits, and eat yellow grits every day for breakfast. Through on a couple pieces of bacon or sausage, and some hot sauce.

Can’t make fast, complementary (P-channel) devices, thus the static power dissipation of n-channel only logic would be huge.

Should have bought a 5.56 mm, now that cheap Russian ammo is no more.

Came here to say the same. I don’t know of any computational heavy engineering software available for the Mac. Unfortunately I’m stuck on Windows for all my software.

For EM analysis, it actually helps to be “on grid” as the gridded solvers have a lot more dynamic range than gridless, like 100 dB more. Analyzing structures such as filters require high dynamic range, so adding a bunch of curved artwork will introduce errors in the simulation, or take much more resources. I do all my PCB layouts on a 0.1 mm grid and try to keep things snapped. I’ll even round footprints to the nearest 25 um or larger.

Also, the GDSII format for IC does not handle curves well. Unlike DXF, it can’t handle a circle, so has to decimate it into a polygon.

When doing signal integrity analysis on PCB, the tools can break those long runs of straight, parallel lines into closed form models (i.e. coupled transmission lines) which greatly speeds up the analysis. With a bunch of curves, you can’t do that, and it has to break those out for EM analysis.

If one could easily make square via holes in PCB, those would be preferable for situations like grounding vias as they better terminate the EM wave.

I’m sure the same can be said of semiconductor manufacturing. My wife’s first day on the job in the clean room, she noticed the plastic ribbons on the vent above the photo resist station were not flapping. When maintenance looked into it, the vent was blocked-off; had been since it was installed. It’s this kind of shit.

She got the hell out of microelectronics and is now a data scientist. The former is a dead end job in the USA and the latter pays better.

It depends on frequency, transmission line with, and bend radius. A properly mitered bend will have less parasitical and radiation than a curved bend. Due to internal inductance, the currents flow at the edges of a trace, thus when you have a curved bend, the currents in the outer radius fall out of phase with the inner. Thus is why you don’t see a lot of curved bends in microwave PCB, rather mitered bends.

Wouldn’t it take a photo plotter longer to interpolate around a curve? Seems like 0/45/90 routing would be faster to plot.

Well what about us that didn't have loans and cash-flowed it? I have saved enough cash for my kids education by not buying new cars, no vacations, etc.. Seems I am punished for being frugal. I should blown it all and let the tax payer foot the bill.

Sure, 0.25 Gbps, it’s not like your ISP is lying. I had 0.1 Gbps before Google Fiber came through.

Supposedly it was stolen from Africa, at the time they were flying gliders off the pyramids.

No it’s not. You are just accustomed to Chinese garbage electronics.

Yep, I know of a microwave laminate (i.e. Teflon PCBs) whose yield dropped to 10% after a certain solvent was banned. The substitute does not work worth a shit.

I picked up an Indigo^2 with monitor in 1997 for $250. Had to buy IRIX CDs for $200 in eBay, but it was a nice machine. Gave it to a guy several years later, along with several other classic Unix workstations. Kind of wish I had them now.

The RTX is really slow for FP64.

"There was - possibly still is - a crossover group typically made of electrical/electronic engineers who knew just enough traditional EM theory to be dangerous, but not enough to know what they didn't know about GR and QM."

The same can be said for physicists and mathematicians who know just enough EE. As a practicing EE who specializes in RF and antennas, I've had to debunk many crackpot antenna and circuits, who developers are looking for funding. The nice thing about RF is hunks of dielectric and conductor are pretty easy to fabricate or simulate, but they don't even try to prove their ideas.

I had your exact same problem a few weeks ago trying to get P-channel FETs and ended up with the SI2301CDS-T1-E3 which Mouser has just 143 left (which you can't believe).

Same with USB-UART bridges; zip, nada, nothing. I found some Cypress parts a few weeks ago, and I should consider myself lucky.

I won't order PCB until I have all reels of parts on my desk.

Why 70, so you can ignore the millions killed by Stalin and communism?

Back in the last century, we had these levers called emergency brakes. Then they went to parking brake pedals. Now parking brakes are on a button. I want the lever back.

Ha ha, I had to use a slotted line.

As a kid, I acquired three Kodak instant cameras for free, as they were near worthless. Then Kodak lost a lawsuit from Polaroid and was forced to buy them back at $40 each. I made a huge amount of money for that, as a kid.

I have an 8566 at home. Didn’t know about the trace C. Thanks, have to try it.

Inductance would be the momentum of the water; reactance to change in flow. Capacitance would be the expansion tank; reactance to change in pressure.

They seem to be going for about $300 used, though considering inflation less than new. If you could have gotten a good deal, then you’d come out ahead. The price will only increase. I have a 48G and 48GX, and several others. I’d like to collect them all and build a nice display case to house them.

People from 2020 still love the too, ha ha. I have several 35s at work and just got a Swiss Micros DM42 from xmas. Then again, I'm 50 and used these all through EE school and my profession. I have four 32sii still sealed in clamshell package. Went out and bought a bunch years ago when they discontinued them.

https://www.swissmicros.com/product/dm42

I remember listening to the Art Bell episode with Bob Lazar, late at night with the lights out.

My first modem was 300 baud, through I believe 150 baud preceded that. I miss BBS and the old internet.

It has to be cost-plus or no one would do something that has not been done before. Fixed cost is fine for something you have a grasp on production costs.

You can always make impedance measurements with a slotted line, 6-port reflectometer, or vector voltmeter if you don't have access to a VNA. My undergrad microwave professor had us learn on the slotted line before letting us touch the VNA.

Just get an amateur radio license and there are plenty of bands to legally transmit.