madengr

69 ms·

361.
by madengr 7y ago
The woodcuts of the mining machinery remind me of a book I obsessed over as a child. Pick it up if you have kids. Written by L. Sprauge De Camp too, whose was a prolific writer like Asimov. https://www.thriftbooks.com/w&#x
362.
by madengr 7y ago
I assume you are in a high deductible plan (HDP)? They don’t pay anything until you hit ~$4k/person, then 80% until OOP maximum of $7k for a family. But yes, a physical should have been 100% covered. Yeah, so between my employer and
363.
by madengr 7y ago
Mattress shopping is almost as bad as car shopping. I'll buy a used car to get around the sleazy car sales people, but the wife absolutely won't go for a used matresss. I'm sure the mattress markup is astronomical, and I&#x2
364.
by madengr 7y ago
Yes. The integration and polish is what make all the difference. The commercial EDA tools are light years ahead of the open source, and will probably stay that way.
365.
by madengr 7y ago
They probably wouldn't get paid for it. Software piracy of EDA tools is rampant in China. I have not had an issue getting snippets of EDA code (to see how a model is implemented) as long as I sign an NDA.
366.
by madengr 7y ago
Cores
367.
by madengr 7y ago
I don’t think that will ever happen. The knowledge to develop the tools is too specialized and the user base too small. The same goes for any RF tools.
368.
by madengr 7y ago
I find that time domain is best for low-Q devices (antennas) while frequency domain for high -Q (filters). Though there are times when one will mesh a structure better than the other. Thin, double curved dielectrics with metal on both sid
369.
by madengr 7y ago
I was recently testing a commercial FEA package that uses Intel MPI libraries. It is 30% faster on an i7 vs the equivalent core/clock AMD. Another FEA package that does not use Intel libraries has no measurable difference between the
370.
by madengr 7y ago
My mill has the cutter fully surrounded by a vacuum manifold, and the vacuum itself is bag and HEPA filtered. The compressed paper PCBs have horrible properties. The RF laminated all have specific properties for electrical performance; die
371.
by madengr 7y ago
Wow, a coffee company is now a tech company. I didn't bother with the rest of the list.
372.
by madengr 7y ago
I do it at home (PCB mill) for RF circuits on Rogers 5880 and similar materials. At work though (more RF), I just order it. Seems to always be $3k-$5k per run no matter how many boards and what material. You are buying the PCB lines tim
373.
by madengr 7y ago
Yep. Put your finger on the corner of the output coupling cap on a 50 Watt S-band PA. It will turn your skin black from the charring, but doesn't penetrate into the live tissue. Just don't leave it on too long. Could probably g
374.
by madengr 7y ago
Back in the 20th century, we did this with flat-bed pen plotters. Ink makes lousy resist anyway. Much better results using old fashioned transparency and photo resist.
375.
by madengr 7y ago
Well you are in the reactive near-field, so the antenna will de-tune, hence the power amplifier won't see it's ideal match, and not deliver as much power. All depends on antenna design and orientation, assuming they don't us
376.
by madengr 7y ago
I’d just open carry my .45 into the Apple store. Probably wouldn’t go over well with the typical Apple crowd, but guarantee you won’t be robbed.
377.
by madengr 7y ago
What's funnier is to see circuit simulations with bypass capacitors in parallel with ideal voltage sources.
378.
by madengr 7y ago
Ha ha, "If you are very math-oriented maybe it will work for you". The AOE is definitely not math oriented, and not what is typically used for EE courses. If AOE was used for undergrad EE, then 2/3 wouldn't flunk out.
379.
by madengr 7y ago
Good summary. I'd also add that 80% of the difficulty is spent on optimizing the last 20% of performance (i.e. the last dB), which is what separates the hobbyist from the pros, or the art from the quantitative.
380.
by madengr 7y ago
Looks like a neat book. I’d stress early on, once you get to inductance and capacitance, that the energy in a circuit is contained in the fields, which are the consequences of charges (or vice versa). It’s the fields that matter. When you
381.
by madengr 7y ago
I’m surprised they didn’t slow down to conserve fuel and arrive on-time. In the USA, if your flight is more than 20 minutes early, you are usually stuck on the tarmac waiting for a gate. 80 minutes of fuel for that plane must be very expen
382.
by madengr 7y ago
The multi tracks were great for certain applications. I had a 2-XL as a kid, and it worked great for that. https://en.m.wikipedia.org/wiki/2-XL
383.
by madengr 7y ago
Reminds me to start collecting HP calculators. I have a few, but would like to collect all of them and put them in a display case. Anything non-RPN is an abomination.
384.
by madengr 7y ago
Yes. It took two attempts. The second attempt worked, electrically, but didn’t have a measurable effect on the noise reduction, so did not end up doing it.
385.
by madengr 7y ago
I stuck 01005 caps between BGA balls on a Spartan 3, but that was in attempt to solve an EMI issue, rather than a specific design goal.
386.
by madengr 7y ago
Can’t beat 20th century HP test equipment. The pinnacle of quality. I have an 8566B at home. These things are built like tanks, and were made to operate in high temperature environments. We had about 10 of them at work, and the only thin
387.
by madengr 7y ago
I’m above the age limit for your club, and have done plenty with GNU Radio. https://github.com/madengr
388.
by madengr 7y ago
I thought just about all bows are made from pernambuco (Brazil tree wood). The article seems to indicate there are travel restrictions with it. I recently bought one for my daughter, and they are not cheap, but they sound much better than
389.
by madengr 7y ago
Isn’t Kubla Khan opium induced, and someone killed his buzz in the middle of it? I know Rush uses some as lyrics.
390.
by madengr 7y ago
I remember ~35 years ago we played that for the English class, and Alexander the Great for history. Still a big Maiden fan, and going to their concerts.

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