I just put up an inverted vee today. One leg is ~60 feet long, the other I might could get close to 100 feet. I've got a W2AU balun at the center, so I'm not too worried about common mode interference (right now, anyway 😂) and I've got a tuner, so I'm not too worried about SWR. I'd like to work several bands with this if I can. Do I leave it long, or will I get better performance if I cut it for a single band?

Hey all.

I'm Looking for a way to completely invert a sound Frequency-Wise. What I'm looking for is the equivalent of inverting Images in photo editing apps but in sound. In Inverting images, every color becomes its opposite. In music and sound, this translates to a situation in which if a sound has only mid to high frequencies, its inversion will only have low frequencies, and vice versa. If you imagine a bandpass filter, its inversion will be a low-pass and a high-pass filter.

METHODS I HAVE TRIED:

Since White noise contains all the frequencies, I Imagined If I carved out frequencies of my original sound from a white noise using a frequency sidechain plugin like Trackspacer, Neutron, or Soothe, I would get the proper inverted sound, but to my despair, none of them brought a satisfactory result.

So I've got some large ferrite cores from several flyback transformers and 3D printed a bobbin out of Nylon for one of them. I figured I could try and build a 2KW LLC resonant converter as a challenge. To convert 48V into 170VDC which is then fed to an inverter to generate an variable frequency supply. Probably just 60Hz for now to keep it easy.

Converter specs:

• Vin = 13S Li-Ion (40V to 55V)
• Vout = 175V (a bit high to accommodate some losses in the inverter stage)
• Power = 2KW (I want a solid 15A rail, not my shitty "550VA" UPS which shuts down at only 300W.

Napkin math suggests currents in excess of 50A on the primary.

The first step is going to be stepping up the voltage, choosing a topology. A boost and flyback converters would be too inefficient for a practical implementation at such high powers. A forward converter might be an option. but the best I could achieve was a K of 0.9985 on my transformer, not sure if that's good enough.

I like LLC converters! but I never designed one before. These have a limited conversion ratio and low dynamic range (so it can't be voltage modulated at the output, has to be done in a separate inverter stage) but they do offer excellent load regulation and high current! They are pretty insensitive to leakage flux. In fact, is it possible to design a single magnetic that to fill the roll of Lr, Lm, and the transformer?

I found a very helpful article by Infineon (URL below). My realized design in LTspice really overdelivers! It pushes 15A, 175V, 2.6KW under full load with minimum input voltage, and at no load, max input voltage, It under-delivers, providing 170V. The frequency range is 24kHz to 250kHz. That's good it means I can keep it in regulation with a tighter frequency range.

The values I calculated are as follows:

• Cr = 8.5uF
• Lr = 1.2uH
• Lm = 7.2uH
• Ls = 95uH

The PROBLEM is the 200A peak currents in the primary!!!! (guessing around 130A rms, not quite sinusoidal at the max load min input voltage). The primary voltage also resonates up to 130Vpk! While this design "works" on paper but does not sound reasonable to me. Where did I go wrong?

I picked 3.7V to be the nominal voltage for this design.

• Amax = 3.7/3.0 = 1.23 (max load and min input voltage edge case)
• Amin = 3.7/4.2 = 0.88 (no load and maximum input voltage edge case)
• Fmax = 5 Hz normalized. (arbitrarily chosen to avoid a huge frequency range)
• f = 50kHz (arbitrarily chosen so fmax = 250kHz and fmin = 24kHz)

**Step 1: fi

Now that I should hopefully be done with internship interviews for the rest of my life, here's a mega list of almost every interview question I was asked from 150+ interviews at Facebook, Apple, Amazon, Nvidia, Google, Microsoft, Qualcomm, Analog Devices, Texas Instruments, Northrop Grumman, SpaceX, Tesla, etc. This is going to be a massive step up from "part 1" that I posted a while back now that I have more coursework, internships, and interviews under my belt.

This was originally going to be part of the Interviews chapter of my internship search guide, but that post just got WAY too long so I decided to create a separate post just for this repository of questions. That post is still chock-full of interview advice and experiences, so check it out when it's ready! And before you get started, take a guess at how many questions this list has! (bonus points if you comment your guess because I'm also curious about your guesses!)

If you're reading this on Reddit (or not my website), check this post out on my website! You'll get this super cool table of contents bar that will make navigation much easier through this massive post. Any updates to this list will be reflected on my website, not this Reddit post or anything else. Also Reddit only allows posts up to 40,000 characters and my full list way exceeds that so you'll need to hop over to my website to get everything else. For some reason, Reddit has trouble recognizing my list so this Reddit post will have bullet points to identify questions, while my website has a BIG numbered list. And more importantly, you'll be giving me ad revenue!

Disclaimers and Notes

• These questions were for internships, but there's a lot of overlap with full-time (FT) interviews. In fact, I'm doing FT interviews at the time of writing this and they basically ask the same stuff, there are usually just more FT interviews so they have an opportunity to dive deeper and ask more questions I'd even say some of my internship interviews were harder/more in depth than my FT interviews. If the questions end up being super similar, I may just rename this post instead of making a new one lol.
• These questions are reflective of my s

The Album:
L’étrange Histoire de Mr. Anderson is the second studio album by Toulousian rapper, producer, and director Laylow, also known as Jey or Mr. Anderson; with features from Hamza, Damso, Alpha Wann, Wit., Nekfeu, Fousheé, & slowthai; and accompanied by a short film starring Laylow and directed by Osman Mercan.

Listen:
Youtube
Apple Music
Spotify

Music Videos:
STUNTMEN
SPÉCIAL

Song Lyric Translations:
Fortunately, Genius provides English translations, which you can find here!

Watch the Film:
Youtube (should have subtitles)
Letterboxd

Background:
Laylow, born Jeremy Larroux on March 12, 1993, is an Ivorian-French rapper hailing from Toulouse. Raised in Toulouse and Abidjan, his introduction to hip-hop was through the American stars of the early and mid 2000s, namely G-Unit and Ja Rule.

His musical career began as part of the Toulousian collective Fattoyz, which is nowadays only active as a streetwear brand, and his first mixtape, heavily inspired by American West Coast rap, was a collaboration with fellow Toulousian Sir’Klo, titled Roulette rousse or Russian Roulette, and released in February of 2013. This tape also included Laylow’s first collaboration with Montpelliér rapper Wit., who would go on to feature on most of Laylow’s solo projects. Later that year, the duo of Laylow and Sir’Klo dropped another tape, a free EP titled 310.

In 2014, Laylow released his first solo works, a trilogy of EPs titled Volume Uno, Volume II Asian Tour, and Volume 3, between March and November of that year. Notably, the name “Mr. Anderson” appeared for the first time in the production credits of these EPs, being Laylow’s alter ego and production alias. Laylow’s next offering, a 201

Give this a read:

By the time I left my teenage years, I had amassed a following of sixty thousand on my platform. At that point I had shared the stories of twenty thousand people from around the world. Even though I haven’t directly experienced many bad or difficult things that other people have, I felt like I had absorbed the pain, joy, and sorrows, of all those people, and was suddenly holding it in my hands. As I stared at my hands, in that moment I let go of it all. It was like all of the negative energy I had drawn into myself was suddenly released back into the world, resulting in complete chaos as the wave of new energy struggled to find a way to fit in with the existing dimension.

It simultaneously created and destroyed existing boundaries that were stable up until that point. The old energy fell through to make room for the highest path. Once the dust had settled, I was in the hospital, my sister broke up with her boyfriend, my best friend’s boyfriend broke up with her, my uncle died, riots in Minneapolis broke out as the George Floyd riots and Black Lives Matter movement swept the nation, and there was a surge of COVID cases, all in the course of one week in mid May of 2020.

It was Iike my world had inverted. The weight I felt had lifted off of me was indescribable. The burden of twenty thousand souls was finally gone, and I was finally free from all of the pain and suffering of countless others that I had internalized. Everything clicked into place in that moment. I understood the reason I was existing. It seemed past, present, and future all coincided on that point. Life was so beautiful. I saw everything on a literal and metaphorical level all at once. I just sat on my bed and cried tears of joy, relief, and happiness, thinking about everything that had just lead up to that moment in time in a matter of seconds. To someone else, this is know medically as a psychotic break from reality. And that is what my family, who had absolutely no idea about that fact that I even had more than a few hundred followers, thought it was as well. I tried to find the words to somehow explain that entire narrative to them as they continually were asking me what was wrong, but I was so in shock of feeling awake for the first time, that there were no words to even begin to explain it. No experience in all of my nineteen years of living compared to it.

It was only a few days before that, that I had listened to my first third eye opening meditation. I u

Do your worst!

Hey, guys! Was nerding out on Jacob Collier videos and collected what I learned. There are some really cool ideas in here that I think you'll really enjoy. #2 resonated with me a lot.

Hope it helps!

---

Most of you probably know Jacob Collier. The wunderkind is a household name in jazz and a peak “musician’s musician”, and that recognition is well deserved. The guy is a bonafide musical genius, asked Quincy Jones to be friends instead of his manager at first, and has been described as “today’s Mozart”.

Yes, his music isn’t for everyone — it can feel gimmicky at points and overtly unrestrained, but his passion for music is infectious. I’m wholeheartedly a fan for reasons that go beyond his records and include his love for teaching.

Sometimes when people are so richly talented, they struggle to explain how they think about music in accessible, helpful ways. It makes me think of a jazz violin teacher at my old music school that was clearly a genius but was notorious for giving awful lessons.

That isn’t the case with Jacob, however. Once you dig in behind his music, you’ll discover a collection of legitimately fascinating music nerdery but also a lot of lessons on playing and practicing music that anyone can take and apply to their own journey.

Here are a few of my favorite things I’ve learned from Jacob Collier:

1. View harmony through the lens of emotions

After watching a lot of Jacob, you begin to notice that he thinks of harmony in terms of an emotional palette in which he paints. He often describes harmony as a spectrum between light and dark. This applies to modes, cadences, intervals — any particular mechanism for analyzing music.

This is a beautiful and powerful way in which to think about harmony. If we know in an instant that injecting a #11 into a minor chord will cause a burst of uneasiness (that we know innately) or a 9 on top of a major chord will lend a bit of ethereal brightness, we can better associate feelings with our choices, leading us to make more informed musical decisions.

2. The more notes you have, the more harmonic responsibility you have

Just because there is a cloud of notes instead of a single one doesn’t mean you can get away with being sloppy. Treat each note you add into a chord with weight. For single-note instruments, you could extend this to the harmony you are implying at any given point.

I’m guilty of just playing notes on a guitar or keyboard without listening to each separate note and thinking about wh

 

 

#Picks Of The Week (by u/lefuniname)

####1. Crash Comet - Fragments Of Time EP [Differential] Recommended if you like: Nelver, Nic ZigZag, Dustkey

Get out the candles and get comfy, 'cause it's time for some crying Christmas content, courtesy of Crash Comet's criminally competent compilation of conceptually coherent music!

If I did a list of people whose music I enjoyed the most this year, maybe even factoring in how underrated I believe they are, Crash Comet would be way up there. No really, literally everything the London-based producer put out this year was amazing and I loved it to death. It started off with the incredible Infatuation on Simplify, which was both my personal introduction to his work and the first time I featured him on here, and continued on with the tear-jerkers that were Feeling on High Tea and Berlin with Dustkey on Liquicity. While this is not necessarily an impressively large list, it is reeking of quality. All of these tracks are in my Best Of 2021 list, all of these are in my "Top Songs 2021" Spotify Wrapped list, and yet, I'm not sick of them one bit. It wouldn't surprise me at all if they enter my all-time favourites list at some point too.

So when he announced a full-length EP a few months ago, I obviously got excited. Even more amazing tracks that I can loop forever! Even better, it was going to be released on my favourite up-and-coming liquid label, Differential Recordings. Well, here we are a

It really does, I swear!

For context I'm a Refuse Driver (Garbage man) & today I was on food waste. After I'd tipped I was checking the wagon for any defects when I spotted a lone pea balanced on the lifts.

I said "hey look, an escaPEA"

No one near me but it didn't half make me laugh for a good hour or so!

Edit: I can't believe how much this has blown up. Thank you everyone I've had a blast reading through the replies 😂

This is a bit of hermetic philosophy, from my understanding. The people on this sub seem exceptionally bright and primed to hear this kind of thing. I know personally, studying and practicing what I learned from philosophy, especially hermetic, changed my life. It has also benefited many around me that I interact with. I also know I am finished here, unless for some reason I change my mind later in life. I doubt it. Anyway, without ado:

The Universe is Mind. It is a Mental Creation.

I don't mean this in the common interpretation sense, that everything is simply a creation in the individual mind, or even worse the brain. Yuck, materialistic dogma. Let's leave that for the plebs chasing their tails. Nihilism is a tool we will not need to escape, it is only a burden we cannot afford to carry.

No, instead, we can think of all of physical creation, and any spiritual reality inside or above that, as actually akin to One Living Mind.

What people call God, regardless of what it means to them personally, can most accurately be described as Mind.

All the physical laws we experience, lifeforms evolution has produced, the trillions of stars and galaxies we view through our telescopes, are all as Visualizations in the Mind of God, who Is Mind.

The Universal ALL, source of everything, is a form of Mind, infinite consciousness, and we live inside of that Mental Universe.

Human beings are actually identical in essence to God, as our minds are fractal (having all of the parts of the whole) holograms of the universal mind. Physics has a lot to say on holographic theory, it's very interesting. We are like individual cells of a God form, such as the cells that make up our physical body are to us.

This is something all of the ancient teachers knew, the Buddha, Jesus, Krishna, the hundreds of other Sages and prophets throughout time. This basic idea is one of the oldest philosophical conceptions in existence.

Mastery over the knowledge of this principle is why we had ancient civilizations that were apparently more advanced in many ways than we are now. It is how prophets of past consciously performed miracles. It is why things like Magic, though in the realm of fantasy for most, actually exists.

We are in a constant feedback loop with the external world. Perception of an external event occurs, an emotion arises in response, thoughts then occur about the emotions, they're processed, the external event is understood. This is pretty basic, but the other half of it les

They’re on standbi

Buenosdillas

Pilot on me!!

I need to design these three inverters for a low power 10W capacitively coupled wireless energy transmitter I'm designing for a science fair. I've read many papers, however they all detail new and novel methods, while I'm really looking for a tried and true standard. I'm looking for something like a cookbook textbook.

Dad jokes are supposed to be jokes you can tell a kid and they will understand it and find it funny.

This sub is mostly just NSFW puns now.

If it needs a NSFW tag it's not a dad joke. There should just be a NSFW puns subreddit for that.

Edit* I'm not replying any longer and turning off notifications but to all those that say "no one cares", there sure are a lot of you arguing about it. Maybe I'm wrong but you people don't need to be rude about it. If you really don't care, don't comment.

When I got home, they were still there.

What did 0 say to 8 ?

" Nice Belt "

So What did 3 say to 8 ?

" Hey, you two stop making out "

I won't be doing that today!

You take away their little brooms

This morning, my 4 year old daughter.

Daughter: I'm hungry

Me: nerves building, smile widening

Me: Hi hungry, I'm dad.

She had no idea what was going on but I finally did it.

Thank you all for listening.

There hasn't been a post all year!

It’s pronounced “Noel.”

Why

After all his first name is No-vac

See pics of my work and my resume at technicalpowerdesign.com

Email: sierra@technicalpowerdesign.com Please email rather than messaging me on reddit. I don't check this account often.

My name is Sierra and I'm looking for electrical engineering work. My degree is a BS in EE with an emphasis in control loop design. I have extensive experience in power electronics design, RF, and PCB layout.

I've been in this field for about 15 years. I'm based in the southern US and am a native English speaker. I talk to clients on Discord and Zoom primarily and can voice and video chat with you if needed as well. I'm happy to design parts of a product for you, do prototyping to test out the feasibility of an idea, or just discuss how to solve a problem you encountered with your project. Feel free to email me to discuss your needs.

Engineering has always been a hobby for me so if you give me interesting work the price will be low and my enthusiasm will be high. I'd be happy to hear what you've got regardless of the project. I'll let you know if I'm interested with no obligation. Interesting work is around $50 an hour depending on difficulty (price increases with complexity). Most of what I do for fun is mechanical and electrical engineering work but I often start new projects before I finish existing ones. Having clients to do consulting work for helps keep me on track with deliverables and deadlines (which I'll try my best to meet) while also allowing me to make a little money to finance my own projects.

The following descriptions of my experience mention the most advanced work I have done in these fields. If you have a simpler project I can likely help as well. I'll be able to help you blink a light, connect a display to a microcontroller, make a programmable lighting controller, build a line following robot, build a hoverboard, etc. No one has yet hired me to build a BattleBot but that sure would be fun...

General: PCB design, schematic capture, microcontrollers, soldering (small stuff if needed), design for manufacture, displays, touch screens, Bluetooth LE, android (please don't give me too much software work though). I do know enough C, C++, and Java to get by. I prefer to write in C. Amplifier design for audio and high speed instrumentation applications. Transimpedance amplifier design for high speed sensor applications. Lumped and active filter design. Finite element method magnetics design for inductors and electromagnets. Finite element analysis simulations

Suppose you have a resistive load (or resistive-looking) connected to the mains through a switch. Further, suppose you control that switch with pulse density modulation synced to the power frequency, so it turns on at a zero-crossing and stays on for two half-cycles. A basic implementation would be periodic at some divisor of the power frequency, but you could add dithering if that presents a problem.

I know why phase-fired triacs are bad (poor power factor, harmonic currents distort waveform for other users), but is there any reason not to do what I described above?

Ideally, if you deploy many such devices, they are uncorrelated, so the more of them you have downstream of any particular transformer/generator/etc., the closer the average power factor gets to 1. But I am slightly worried there might be some way they could couple through the mains and self-synchronize.

As for why you might want to do it,

1. Controlling heating elements smoothly, for less wear due to thermal cycling and more pleasant user experience.

2. Improving low-load efficiency of active power-factor-corrected switching power supplies, by turning the PFC boost converter completely off for one or more cycles, so you don't incur switching losses.

3. Improving the throttle range of "inverter" microwave ovens. (The one I have reverts to super-slow PWM below 30% power).

Edit: I duckduckwent looking for information about subharmonic loads and found this paper, but the problems it discusses sound like they were caused by connecting reactive loads with resonant frequencies below the power frequency, which is either not the same as what I'm thinking of, or I don't understand why it would be the same.

What, then, is Chinese rap?

Edit:

Notable mentions from the comments:

• Spanish/Swedish/Swiss/Serbian hits

• French/Finnish art

• Country/Canadian rap

• Chinese/Country/Canadian rock

• Turkish/Tunisian/Taiwanese rap