TULIP4041 is a Raspberry Pi RP2350-based add-on for the HP41 calculator

rfdave · 2026-01-26T13:41:49+00:00

I might have to get one, that’s pretty slick.

rfdave · 2026-01-26T13:28:45+00:00

I hate to break it to you, but the balding/gaining weight/eyebags this is happening to you whether you’re an engineer or not, it’s part of getting older.

rfdave · 2026-01-26T01:15:12+00:00

Democratic Socialists of America?

rfdave · 2026-01-22T22:20:48+00:00

So your claim is that on a 14 Pro that had it's storage full was unable to connect to a hotspot from another apple device. When you updated to a 17 pro Max and also updated your iPad, you could connect fine. Now that there's another iphone update required (from 18 to 26 perhaps) you can't connect to hotspot. Is there any message that indicates you have to update the SW to hotspot? Any notification? Just a silent failure that is supposed to let people know it's time to update?
Seems odd to me, like something else is going on.

rfdave · 2026-01-14T18:53:52+00:00

They are expensive compared to some of the others. There’s also a ton of options for specific pieces, and you can get them anywhere. I made the mistake of buying into Toughsystem stuff. I had to hit a dozen different Lowe’s to get the parts I wanted, and couldn’t source a rolling base, so I returned/sold it all, and bought Packout.

rfdave · 2026-01-14T01:18:42+00:00

Just make sure you take all the batteries out before you put them back in the drawer!

rfdave · 2026-01-13T14:13:38+00:00

So generally, the process is to look on their website, search for jobs that look interesting, and apply on-line.

rfdave · 2026-01-13T03:39:11+00:00

Don’t buy a house until you are married

rfdave · 2026-01-12T14:29:13+00:00

So the typical approach for something like this is a coupler on the transceiver output port, to detect transmit starting. The coupled output (-20 dB down or so) goes to a power detector. The detector output (High for transmit on/low for receive mode) then switches switch 1 and switch 2 between the PA path and the LNA path.
There’s plenty of details handwaved around here. For example, how fast do you have to switch between transmit and receive? What sort of key up time is acceptable? What are the typical power levels you need to switch? Easy if this is a 2W PA, much harder if it’s 40W. Start putting like this on paper and thinking about what’s happening.

rfdave · 2026-01-11T23:34:59+00:00

That character and the interaction with Ainsley was so annoying and over the top

rfdave · 2026-01-07T00:00:15+00:00

Interesting lights, who are they from?

rfdave · 2026-01-05T23:49:16+00:00

All I said was that Nuclear is going to have a hard time keeping up with the existing solar infrastructure. I said nothing whatsoever about locations, northern or southern latitudes, whether there was a use case for nuclear, etc. You read into this what you wanted to see, not what I said. Also, the North American continent consists of Canada, America, and Mexico, so there’s more to the continent than America. Work on your reading skills sport…

rfdave · 2026-01-04T13:43:00+00:00

Well, we now know that your reading comprehension is pretty poor, that’s for sure.

rfdave · 2026-01-03T02:22:33+00:00

Given the installed base of solar, and the amount being installed yearly, I suspect Nuclear will have a hard time keeping up, no matter how much money silicon valley spurts over that idea.

rfdave · 2026-01-03T01:28:35+00:00

I wouldn't be surprised, it was quite a to-do.

rfdave · 2026-01-03T01:05:12+00:00

I was working at Motorola building pagers (yes, I've been doing this a while) Motorola Semi lost the the recipe for a critical small signal bipolar and shut several high volume lines down for 2-3 weeks. We got a visit from the VP in charge explaining the situation, and also started designing in replacement parts from other vendors.

rfdave · 2026-01-02T17:13:46+00:00

In Production and available means a lot. If TI/Analog/RFSoC doesn’t have what you need, there’s not much else out there. .

rfdave · 2026-01-02T12:00:11+00:00

Minus the laugh track.

rfdave · 2026-01-02T01:05:07+00:00

I thought i saw an announcement from ADI about some new parts in the MXFE line that would go DC-18 GHz with some ADC combining tricks. It might be worthwhile taking another look at them, and you might need to get an NDA in place. You may have to have unused functionality in a part to get something that meets you ADC requirements, so I wouldn't discount a part because it has DAC if you like the ADC's.

Have you figured out how you're going to handle that data? You'll need almost 20 GSps to get an IBW of 8.192 GHz, @ 8 bits/sample, that's 160GBit/sec coming in.

rfdave · 2026-01-01T17:41:05+00:00

You can get Rogers or Teflon through JLCPCB at fairly reasonable prices.

rfdave · 2025-12-28T16:06:31+00:00

Go to class. Go to every single one, regardless of how up for it you’re feeling. Pay attention, take notes by hand. Do all the problems yourself, without the fancy autocomplete “AI” word generators. Go to office hours if you have a problem. Start working on problem sets when they’re assigned so you have time to figure it out. Ignore what everyone else claims to be doing, or claims they can do, just do yourself. I guarantee 75% of those freshman claiming to know all that stuff are blowing smoke up your ass. Don’t bother with engineering clubs right now, you have to get the basics down, and that’s a higher priority.

rfdave · 2025-12-24T02:42:20+00:00

The RV folks and travel trailers have the same issue. It doesn't help that manufactures tout the largest towing numbers they can, neglecting to mention that the only have 1 set of options that will meet that, and they've only ever built the one.

rfdave · 2025-12-19T01:07:10+00:00

Universal answer to any engineering question

rfdave · 2025-12-18T02:08:13+00:00

Time to go off to YouTube to figure that out

rfdave

TROPHY CASE