Advanced Snake Oil

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Re: Advanced Snake Oil

Postby azazello » Fri Dec 09, 2016 2:11 pm

Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L&E80CC Siemens&Tel-n.
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Re: Advanced Snake Oil

Postby Geek » Sat Dec 10, 2016 12:56 am

I hate 2016 :'(
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Re: Advanced Snake Oil

Postby soundbrigade » Mon Dec 12, 2016 9:59 am

Well, before hanging up your stockings by the fireplace, rread this:

The Physics of Santa and His Reindeer

No known species of reindeer can fly. BUT there are 300,000 species of living organisms yet to be classified, and while most of these are insects and germs, this does not COMPLETELY rule out flying reindeer which only Santa has ever seen.

There are two billion children (persons under 18) in the world. BUT since Santa doesn't appear to handle the Muslim, Hindu, Jewish and Rudolph Buddhist children, that reduces the workload to 15% of the total — 378 million according to Population Reference Bureau. At an average (census) rate of 3.5 children per household, that's 91.8 million homes. One presumes there's at least one good child in each.

Santa has 31 hours of Christmas to work with, thanks to the different time zones and the rotation of the earth, assuming he travels east to west (which seems logical). This works out to 822.6 visits per second.

This is to say that for each Christian household with good children, Santa has 1/1000th of a second to park, hop out of the sleigh, jump down the chimney, fill the stockings, distribute the remaining presents under the tree, eat whatever snacks have been left, get back up the chimney, get back into the sleigh and move on to the next house. Assuming that each of these 91.8 million stops are evenly distributed around the earth (which, of course, we know to be false but for the purposes of our calculations we will accept), we are now talking about .78 miles per household, a total trip of 75½ million miles, not counting stops to do what most of us must do at least once every 31 hours, plus feeding and etc.

This means that Santa's sleigh is moving at 650 miles per second, 3,000 times the speed of sound. For purposes of comparison, the fastest
man-made vehicle on earth, the Ulysses space probe, moves at a poky 27.4 miles per second — a conventional reindeer can run, tops, 15 miles per hour.

If every one of the 91.8 million homes with good children were to put out a single chocolate chip cookie and an 8 ounce glass of 2% milk, the total calories (needless to say other vitamins and minerals) would be approximately 225 calories (100 for the cookie, give or take, and 125 for the milk, give or take). Multiplying the number of calories per house by the number of homes (225 x 91.8 x 1000000), we get the total number of calories Santa consumes that night, which is 20,655,000,000 calories. To break it down further, 1 pound is equal to 3500 calories. Dividing our total number of calories by the number of calories in a pound (20655000000/3500) and we get the number of pounds Santa gains, 5901428.6, which is 2950.7 tons.

The payload on the sleigh adds another interesting element. Assuming that each child gets nothing more than a medium-sized lego set (two pounds), the sleigh is carrying 321,300 tons, not counting Santa, who is invariably described as overweight. On land, conventional reindeer can pull no more than 300 pounds. Even granting that "flying reindeer" (see above) could pull TEN TIMES the normal amount, we cannot do the job with eight, or even nine. We need 214,200 reindeer. This increases the payload (not even counting the weight of the sleigh) to 353,430 tons. Again, for comparison, this is four times the weight of the Queen Elizabeth. 353,000 tons traveling at 650 miles per second creates enormous air resistance — this will heat the reindeer up in the same fashion as spacecraft re-entering the earth's atmosphere. The lead pair of reindeer will absorb 14.3 QUINTILLION joules of energy. Per second. Each.

In short, they will burst into flame almost instantaneously, exposing the reindeer behind them, and create deafening sonic booms in their wake. The entire reindeer team will be vaporized within 4.26 thousandths of a second. Santa, meanwhile, will be subjected to centrifugal forces 17,500.06 times greater than gravity. A 250-pound Santa (which seems ludicrously slim) would be pinned to the back of his sleigh by 4,315,015 pounds of force.

In conclusion: If Santa ever DID deliver presents on Christmas Eve, he's dead now.
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Re: Advanced Snake Oil

Postby WA4SWJ » Mon Dec 12, 2016 4:40 pm

Santa denier!!!!!!

(lol)
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Re: Advanced Snake Oil

Postby soundbrigade » Tue Dec 13, 2016 5:47 am

I don't deny Santa, just gives you an explanation why the thick layer of ashes is covering the Winter sun aroudn 24-25th of December each year. ;)
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Re: Advanced Snake Oil

Postby hilldweller » Tue Dec 13, 2016 6:00 am

Just remember that Santa spells Satan when you rearrange the letters. Ponder that. (???) (666)
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Re: Advanced Snake Oil

Postby DeathRex » Tue Dec 13, 2016 11:30 am

Wait, wait, wait, how do you make the yule tide gay?
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Re: Advanced Snake Oil

Postby soundbrigade » Tue Dec 13, 2016 12:15 pm

For the few belieber ... (stop) .. I mean belivers, here's some Yule tide gaiety.

Santa Claus Is Coming to Town

zebratomte440.jpg
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Re: Advanced Snake Oil

Postby soundbrigade » Thu Dec 15, 2016 2:14 pm

Not as much as snake oil as some interesting measurements.
Carefully designed and used tubes (triode) shows VERY LITTLE distortion:
http://www.bartola.co.uk/valves/2012/06/17/thd-benchmark/
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Re: Advanced Snake Oil

Postby soundbrigade » Sun Jan 08, 2017 1:19 pm

I have been playing a little with a new and very fun and VERY fun toy.
From a tip on Swedish HiFi-forum I bough TEN 3+3W chip amplifiers for just USD 2.20. Named PAM8403 and propably not a traditional class D switching amp but some kind of BTL amp. The pcbs can be found everywhere on eBay and AliExpress.

This littel bastard can solve many problems when it comes to small and/or portable equipment.

I wired up one simple stuff and have started with a second that will be an iPod-amp with line inputs.

Here are some pics of the pcbs, my first amp that has been playing all weekend (good quality!) and the second.

PAM_01.jpg
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PAM_03.jpg
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PAM_08.jpg
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PAM_10.jpg
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Did I mention that it runs on 2,5 - 5V?!
Magnus

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Re: Advanced Snake Oil

Postby TomMcNally » Sun Jan 08, 2017 5:22 pm

Looks like fun - can't beat the price ! There are many types of these on eBay, just search PAM8403. Some have volume controls and I/O, etc.

... tom
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Re: Advanced Snake Oil

Postby hilldweller » Mon Jan 09, 2017 4:51 am

Wheres the tubes? (n)
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Re: Advanced Snake Oil

Postby EWBrown » Mon Jan 09, 2017 9:13 am

PAM8403 boards available in USA, includes volume control with power switch. Ships from Colorado.

Image

http://www.ebay.com/itm/191879583686?_t ... EBIDX%3AIT


Miniature 2 Channel * 3 Watt PAM8403 Class D Stereo Audio Power Amplifier Module Board with Power Switch and Volume Control Potentiometer

This miniature PAM8403 module is a 3W, class-D stereo audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction, all in a form factor about the size of a US postage stamp. It can operate from a 5V USB power supply or batteries, and includes a power switch and volume control potentiometer for ease of use.

It can be used in any DIY design requiring a miniature audio amplifier, especially portable and mobile applications operating on battery power.

Features:

•Can use the computer USB port, USB power bank or a mobile phone charger to supply the 5V support power
•Battery power can also be used
•High efficiency: 90%
•Provides 3W (left channel) + 3W (right channel) output power into a 4Ω speaker load and 5V power supply
•CMOS class D amplifier design for high efficiency and low cost
•Noise canceling circuit built into the amplifier board
•Power on / off without popping noise
•Integrated power switch and volume control (turn knob fully counter-clockwise to turn off)
•Module has short-circuit current protection, under-voltage lockout and over-temperature protection (shuts down at an internal temperature of 140C +/- 15C)

Specifications:

•Operating voltage: 2.5V-5.5V
•Speaker Load: 4-8 Ohms
•Size: 29 x 20 x 12.5 mm (L x W x H); 29 x 35 x 12.5 including volume control knob
•Net weight:8g

Package Contents:

1 x PAM8403 Class D Stereo Audio Power Amplifier Module with Volume Control

Specifications and usage instructions

Note:

Left and right channel "negative" connections should not be connected together, otherwise it may damage the module.
Speakers (load) should be connected before power is applied to the module.
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Re: Advanced Snake Oil

Postby soundbrigade » Mon Jan 09, 2017 11:09 am

hilldweller wrote:Wheres the tubes? (n)


Ooops, sorry! Here are the tubes! ;)

IMG_0239.jpg
IMG_0239.jpg (137.31 KiB) Viewed 30451 times



I am right now listening to a CD from Chesky Labs by a guitarplaying Natasha (guitar-jazz). A very audophilic recirding (2 mics, 2 channels ... you know) and it sounds very natural to me. But still I am into tubes, so don't worry!







... yet :))
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Re: Advanced Snake Oil

Postby DeathRex » Sat Jan 14, 2017 5:05 pm

I was at tubedata.org looking at the 83V when I saw the 4CV100000C.
MAXIMUM RATINGS
AUDIO FREQUENCY AMPLIFIER OR MODULATOR
CLASS AB1
DC PLATE VOLTAGE 20,000
DC SCREEN VOLTAGE 2,500
DC PLATE CURRENT 15 AMPS
PLATE DISSIPATION 100,000 WATTS
SCREEN DISSIPATION 1750 WATTS
GRID DISSIPATION 500 WATTS
HEATER 10 VOLTS 300 AMPS
COOLING - LIQUID TO VAPOR AND FORCED AIR
NET WEIGHT 95 LBS

Damn that's a tube.
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