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1  Main Area and Open Discussion / Living Room / Re: Interesting "stuff" on: December 18, 2014, 03:44:42 PM
I know for a fact that equipment that allows off grid power is a very sensitive issue with building and safety, and other code related agencies.
2  Main Area and Open Discussion / Living Room / Re: Interesting "stuff" on: December 18, 2014, 10:24:46 AM
Laserhacker.com - one of the better alternative power project websites I've ever visited. I'm in the process of gathering materials to try out the crystal power cell project detailed here - and thinking of adapting the supercapacitor boost pack project for a friend's powerboat.

Check it out. It's time well spent.
You just sounded like "Doc" there!
Grin
Why this one of course!
<a href="http://www.youtube.com/watch?v=pLRk4xG-JCI" target="_blank">http://www.youtube.com/watch?v=pLRk4xG-JCI</a>
The Flux Capacitor!
LOL! But which one? Who? Savage? Or the Disney dwarf? Grin
3  Main Area and Open Discussion / Living Room / Re: which phone? on: December 17, 2014, 10:59:25 PM
If you're used to the "old" Windows phones i.e. anything up to 6.5 then you might be disappointed by the way MS has removed much of the functionality you'd be used to. I'm referring here to capabilities such as syncing to your PC (in particular email, calendar, contacts). These functions have gradually been removed since iteration 7. If you use a phone as a phone and a PIM (rather than an entertainment device) then I'd say go for Android. I have a Lumia 520 and for a lower price range phone it's acceptable and does what it sets out to do OK, but after using earlier Windows phones I'm very disappointed with this one. Also the apps no longer seem to be of the quality which was available for the older OS. The other thing which annoys me about all the major stores is the way you can't really do refined searches and 99% of free apps come with ads or limitations which the vendors don't reveal until after you've installed the app.
This is all so very true.  Well said.
4  Main Area and Open Discussion / Living Room / Re: Raspberry Pi project: wireless file server on: December 17, 2014, 08:52:26 PM
I have now been able to play with the Ravpower WD-02 wifi device.  It's pretty cool!  I put a microsd card in there, so I have plenty of storage.  On my tablet, I switch the wifi connection to the device, and I can access the storage wirelessly.  I can do the same with my android phone.  The only problem is that because you are using the wifi connection, you can't use the drive AND have internet access at the same time.  It's one or the other.

This is why I'm using a program called NetSetMan to manage the wifi connections more conveniently.  I can switch back and forth more quickly than with Windows default manager.  It would be nice to figure out a way to get both the internet and drive connected simultaneously, but I think that is not possible.

However, it may possibly free me from using a thumbdrive without resorting to cloud sync services.  We'll see.
5  Main Area and Open Discussion / General Software Discussion / Re: auto switching of network drive mapping on: December 17, 2014, 08:46:32 PM
The trick is not to allow Windows to manage your wifi connections. Many laptops include an OEM supplied utility (usually written by Intel or done for IBM, HP, or Lenovo) that handles all this for you.

For 3rd-party, take a look at freebie/FOSS project Argon; and for "pay-for" check out NetSetMan Pro.  (~€18/$20 USD last I looked)


I just discovered Netsetman a few days ago to deal with my portable wifi drive problem...I'll have to update my other thread on that.  But I love it, very handy.
6  Main Area and Open Discussion / Living Room / Re: Interesting "stuff" on: December 17, 2014, 08:19:09 PM
Laserhacker.com - one of the better alternative power project websites I've ever visited. I'm in the process of gathering materials to try out the crystal power cell project detailed here - and thinking of adapting the supercapacitor boost pack project for a friend's powerboat.

Check it out. It's time well spent.
You just sounded like "Doc" there!
7  Main Area and Open Discussion / Living Room / Re: Animation question: exposures on "eights" or "twelves" on: December 15, 2014, 06:10:14 PM
Thx! I just learned something. Thmbsup
Just trying to get even!
8  Main Area and Open Discussion / Living Room / Re: Animation question: exposures on "eights" or "twelves" on: December 15, 2014, 05:47:00 PM
And interestingly enough, when you translate this rhythm to musical notation (bpm), it is:
twelves = 120 bpm
eights = 180 bpm

Always good to know!  I've always said the natural rhythm I tend to prefer is about 75 bpm.  Cuz I'm all relaxed like that.  West Coast style, yo.
9  Main Area and Open Discussion / Living Room / Re: Animation question: exposures on "eights" or "twelves" on: December 15, 2014, 05:40:11 PM
Well, i was right in that I did miss something (the page before)!  embarassed tongue
[attach=1]

So my assumption was also correct...it's just a division of the framerate.  Which also reveals a very fascinating nugget to me regarding these master animators.  They ARE quite anal!  his whole brain/body is finely tuned to this kind of specific timing, sheesh.  I love learning things like this because occasionally I'll be made to feel uncomfortable or awkward about my attention to detail.
10  Main Area and Open Discussion / Living Room / Animation question: exposures on "eights" or "twelves" on: December 15, 2014, 05:31:42 PM
So I've been studying animation, and perhaps I missed something as I was going through this one book...but maybe someone here can clarify my question.  Here's the passage in question:
[attachthumb=1]

I just want to make sure I'm understanding this correctly.  The only reason why I'm particularly interested is because I also have noticed that I like the Tom and Jerry timing more so than other similar cartoons. 

So...when he says people are walking on "twelve exposures" or "eights", as far as actual time units go [seconds], does that mean (for the 8 example):
cartoons are 24 fps
so 8/24 = 0.3 seconds

is he saying each step takes 0.3 seconds?  Or every two steps (one cycle) takes 0.3 seconds?  I don't quite get it.  It seems like a brisk pace either way.
11  Main Area and Open Discussion / Living Room / Re: Do we have any musical people on DC? on: December 14, 2014, 01:15:34 AM

I'm also observing that those who claim to hear things that I can't are also more *superstitious* than I am as well.

At least you were polite enough not to mention their webbed feet. Grin
Argh!  I don't get the reference.  You know how many hours of google research your posts have caused me over the years??
So...webbed feet, what is that?  A reference to luck?
12  Main Area and Open Discussion / Living Room / Re: Do we have any musical people on DC? on: December 12, 2014, 05:07:14 PM
There are few music videos that have made me happier or feel more vindicated about something than this one. Capacitor types are something I have gotten into more pointless arguments over than anything else. The conclusion Joe Gore reaches is the same conclusion that I had reached years ago when it came to the tone capacitor type when used in passive guitar wiring.

<a href="http://www.youtube.com/watch?v=dEr-66DR8PM" target="_blank">http://www.youtube.com/watch?v=dEr-66DR8PM</a>

Some interesting comments on the video can be found on Joe's webpage here.


His faces!  Hilarious!
Yes, i'm beginning to confirm BS on 90% of this audiophile stuff.  I'm pretty skeptical about anything not involving noise/hiss/distortion or something obvious like that.  But maybe I need to listen to them on better headphones.  Like these!  only roughly $10k for the headphones and required amp:
[attachthumb=1]

I'm also observing that those who claim to hear things that I can't are also more *superstitious* than I am as well.
13  Main Area and Open Discussion / Living Room / Re: We Are the Idiots on: December 11, 2014, 09:40:59 AM
 nono2
14  Main Area and Open Discussion / Living Room / Re: which phone? on: December 10, 2014, 05:57:35 PM
I used Windows Phone for a couple years, starting with WP7 through Cortana. I am presently using Android. I enjoyed using/having a windows phone more than Android. It's a far more consistent, streamlined and intuitive experience.

Honestly, I do not like Android. I don't care for it. It's a convoluted mess of Vendor, OS, and everything inbetween. It is loaded with apps I don't want that I cannot install. As an ecosystem, Android brings me no joy. . . but I wouldn't trade it for Windows Phone today, because Android Just Works, with everything, pretty much all the time. A new service, app or device comes out, it works with Android. Windows Phone, you have to beg, wait, and hope support comes along. And when it does, it's usually half-baked.

Long story short -- I prefer the Windows Phone OS, but you can do a lot more with Android.
I concur exactly.  Well said.

My struggle with the windows phone was that your brain wants to treat it like windows, the windows we love which is full of options and possibilities and third party tools, etc.  But the windows phone is none of those things.  it's even more restrictive than iOS, without the apps.  So it's essentially the most restricted device imaginable.  I stopped using it when the nexus 5 came out.
15  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 05:14:34 PM
For louder headphone levels there are three basic options:

  • a headphone amp that provides more boost - although +24dBm seems to be the standard
  • a more efficient, different design, or different freq response and range set of headphones
  • better ears

FWIW, most of the better headphones strive for a flat (or relatively flatter) frequency response compared to your average speaker system. Most people are so accustomed to "sweet spot" sound that they they think "odd" or "too soft" when they first start using good headphones. (Unless they're those ear-damaging 'ultrabass' variety.) Same goes for studio mastering monitors. You can make the overall level in a headphone sound significantly louder just by boosting frequency bands in the 2khz and 4khz range. So it's not just the overall level, but the frequency ranges themselves that also contribute to your perception of how loud they sound.
I will mess around with these and see how it goes.  It's a good point.  I may be experiencing exactly what you describe.

i will say, I was listening and playing yesterday again with my existing equipment, and it is now not as quiet as I first imagined.  So I'm going through some psychological exercises here. 

16  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 03:39:09 PM
I think that all you really need is an amp that goes to 11.
Grin
If it were a cartoon, I'd just write in "11" "12" and crank the knob a bit more!
17  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 03:16:46 PM
Given the information provided, it was a theoretical question.

That's not a criticism, but merely an explanation of the type of answers you got.
No problem!  It's all useful for me.
18  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 03:14:29 PM
Another good site with information:
http://shure.custhelp.com...-headphone-specifications

The headphones come with this specification for rating, normally given in db/mW.  From that site, the db is indeed referring to SPL (sound pressure).  That's good.  Now we know that for my given headphone rating (96 db/mW), to get 96 db loudness, I need 1 mW.  The voltage for that is 0.78V.

But I want to be able to go hurtful loud sometimes, just so I know my equipment can handle it.  Most people say that 120db is way too loud to listen to for extended periods of time (or even short periods!).  Perfect!

The Headmp says it can do up to +35db in gain.  OK, that means:
96+35=131 db max

Well, that should do it!  So I'm going to get the headamp.

Now, let's do an experiment to see if I'm right or not.  This is it:
The knob can do max 35 gain.  So 0-100% is 1-35 db.
If I want comfy listening volume, like 100 db, where would the knob be?
(100-96)/35 = 11%, so almost a quarter turn of the knob.

Let's say I want 115 db:
(115-96)/35 = 54%, so the knob should maybe be about half turned.

Let's say I want to blow my ears out, 120db:
(120-96)/35 = 69%, so the knob is just about three-quarters turned.

We'll see!
19  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 02:56:30 PM
i appreciate the theoretical discussion here, but I still think the question is simply "What do I need to get the headphone louder?" And I think that's a more simple answer than all the audiophile websites and discussions are making it seem.

I'm liking what this site is saying:
http://www.sengpielaudio....om/calculator-db-volt.htm
Quote
Note: Power gain (power amplification) is not common in audio engineering.
Even power amplifiers for loudspeakers don't amplify the power.
They amplify the audio voltage that moves the voice coil.

This means the ratios (db) are not for power, but for voltage.  So why do I care?  Well, when I'm doing ohm's law, I'm asking a seemingly paradoxical question "Do I need more power?  or more voltage?"  Well, the correct answer is both.  But the right way to think about it from the headphone's perspective is voltage.  The headphone needs more voltage.  So I need an amp that increases voltage (even though it will also increase power).  More importantly, I'd like to know what kind of voltage it is outputting!
20  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 11:35:58 AM
Wouldn't the SPL be a function of the frequency weighting and the transducer as well?

For example, my vintage Acoustic 18" folded horn bass enclosure has a sticker with a warning that it can produce ear damaging levels at even relatively low volume settings. That's because the folded horn increases efficiency by almost behaving like a focusing lens.

When tested with a sound level meter it showed the ability to produce dangerous sound levels with as little as 100 watts pushing it. Since the average stage bass head packs  200 watts and up, it's something you need to be aware of if you're using one.
I think that's precisely the problem I'm having.  As far as I know, there's no formulaic connection between sound levels and electrical circuitry (ohms, volts, current).   With a sound level meter, yes, you can measure the SPL or whatever it is that indicates loudness.

I'm pretty sure the problem is that the supposedly knowledgeable people do not clearly understand it themselves, especially the electrical engineering aspect of it, which is hard to understand anyway.  There's just no obvious, formulaic connection between the electrical circuitry elements and the loudness.  They are using rules of thumbs and using impedance values, but ultimately there's no direct connection.

I think the answer is simply:
I just need an amp with more juice.  The headphones have high impedance, they need more volts (since everyone is talking about voltage).
power = (voltage)^2/R
My R is larger than normal.  For the same amount of power driving low impedance phones, I need more voltage.  It's that simple to me.
for the headamp I want to buy, the max gain is 35.  I think that means if I input 1V, it will output 35V.
Unfortunately, the headamp has odd specs.  It shows specs for "Z" values, which indicate impedance, then gives the rating as watts, lol.
like this...
"Output Z: 10W"
lol, ok.

"How many apples you got in that bag there?"
"I got 30 oranges!"

and that's just one problem in this whole thing.
21  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 10, 2014, 09:55:12 AM
I'm not really sure what your question is.

dB is just measuring atmospheric pressure difference (caused by sound) from a reference atmospheric pressure (silence).

There are different scales though.

The absolute difference is what you should use if you are measuring energy.

However, human hearing is limited, so there are A, B, and C scales (there are others as well). They all measure dB as it relates to human hearing, which is what you should use when you are interested in "hearing" the sound.

The absolute SPL is what you want to know when you want to know which song pumps out more bass and shakes the room more.

So, in short, dB is just a differential ratio, and in this context, it's about atmospheric pressure changes.

Does that sort of make sense?
Thanks  Cool
The issue is this:
Supposedly, there's are calculations you can do to figure out which headphones will work with which headphone amps.  And it's all about volume, really, that's all there is to it.  Either it gets loud enough just right, or not loud enough, or too loud.
There are rules of thumb that are being used for this.  It works, for the most part.
But if you start wondering "Well, what if I don't use the rule of thumb and just do the full calculation?"
That's where you find all these electrical calculations, ohm's law.  However, then the db comes in.  And it's db, as in SPL (sound pressure).  And nowhere along the way does anyone do any calculation relating SPL to any electrical value like ohm, current, voltage.  So I have no idea how the SPL (which is loudness in a sense) to the circuitry.  So how can anyone figure anything out?
22  DonationCoder.com Software / Post New Requests Here / Re: IDEA: File collection manager on: December 10, 2014, 09:34:45 AM
Hey...Data crow is pretty nice!
23  Main Area and Open Discussion / Living Room / Re: Raspberry Pi project: wireless file server on: December 10, 2014, 09:17:52 AM
4wd, I've never used btsync for such large folders!  Good to know that's probably not a good idea.  I'd probably use syncovery for something like that.

I got that ravpower unit, and had a few minutes to play with it last night.  Couldn't do anything with it yet, so we'll see.  There was a weird moment...I plugged in a tiny usb drive into it, and left it on my lap while reading the manual.  The usb drive is made of aluminum.  In a few minutes, it got crazy hot!  So hot, i couldn't even touch for hardly a second even.  That was crazy.  I unplugged it.  Hopefully, nothing is burnt on the ravpower.  I seem to remember something being wrong with that drive.

What I'm looking forward to is trying the Samba capabilities of that thing.
24  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 09, 2014, 07:19:47 PM
The big difference with analog is that distortion increasingly creeps in with increased loudness. So the name of the game was to saturate (we're talking tape here) your audio track with the levels just at the threshold where clipping began to occur. That got the music as far above the noise floor as possible without too much perceived distortion. With digital, we're talking digital distortion - which is fixed. So with digital, you want to be as far above the fixed distortion floor as possible because - if you lower the level - the perceived distortion in the track actually seems to increase. Louder in this case better hides the distortion. Softer becomes more distorted sounding. That's a bizarre effect that doesn't occur in nature - so our ears and brain go nuts trying to deal with it. Apparently on some subconscious level we know what we're hearing is just plain wrong when it comes to digital sound.

Or so it was explained to me.
oh yes!  I believe you have explained this before here and I've clipped it!   thumbs up
oy...it reminds me of this seindfeld scene:
<a href="http://www.youtube.com/watch?v=yecNfSLnxp8" target="_blank">http://www.youtube.com/watch?v=yecNfSLnxp8</a>
"eating onions, spotting dimes!" lol
25  Main Area and Open Discussion / Living Room / Re: Decibels, loudness, amplifiers, formulas...complete confusion! on: December 09, 2014, 05:59:30 PM
Everyone's like yea yea, and gave me the formulas backing it up along with the specs of the headphones and amp, etc.  So I was convinced.  I got it...it's ok, but it "feels" not loud enough because everything is cranked to the max.

LOL I've got a factory but very high-end sound system in my truck that subjected me to much the same experience. Understand I'm guessing a bit here, but... The newer music seems to be designed for equipment that has no baseline "white noise". Everything is digitally clear an sticks to frequencies that remain "comfortable" even when played at earth shattering db ranges. However, when one of my old school favorite songs came on, I found some parts of the guitar solo physically painful because it wasn't "designed" to be played that way over that kind of "new fangled" equipment.
True.  I've had these raging debates also!
The  best conclusion I've heard, especially regarding the issue of the "loudness wars" is that things were just mastered differently before the digital age.  And that, compared to everything else I've heard, makes a whole lot of sense to me.  And I've listened to a few lectures from the master masterers, and they've pretty much said the same thing: that things are just mastered to be loud now, and before it was a different philosophy.  There's the usual curmudgeon like attitudes there also, but for the most part it sounds like things are being mastered for ipods now, whereas before they were mastered for living room players, or hifi stuff.

Eventually, I'm going to go after the whole tube vs solid state thing, too.  I'm both looking and NOT looking forward to that one.
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