Vomit fried amplifier and infrared seeking cat.

[William Sommerwerck]

"josephkk" wrote in message
news:nhlfn95affibepc8mr2u3t75o0artuub63@4ax.com...

Root-mean-square is a calculation method based on the mathematical
characteristics of a sine wave.

No, it is not. The RMS value of any repetitive waveform can be calculated. It
is not valid for "any" unit of measure. It refers to the heating effect of
voltage or current -- and nothing else.

 

I lov this place. There's a name up there somewherer about "sci" and "electronics" etc., so naturally we are dicussiong cat hair which of course must bring up rthe Pythagorean theorum, at leas once anyway.

I'm not buitching, far from it. I like the diversity of topics, I am just noting however, that maybe this should be named "What some guys fix and design shit want to talk about, no matter what it is".

Anyway, without delving into the thermal characteristics of cat hair,k or vomit for that matter, just whay IS RMS ? OK, I guess we know what it is, but which brainiac figured out that this "RMS power", whether oit exists or not, was goiulg to beecome the defacto standard for poqwer amp ratings, favored ove PMP or PIP or PIPILS (Peak Instantaneous Poower If Lightnong Strikes) or evdn volts fro that matter ?

Why not say "this baby can put out 80 volts peak into an eight ohm (or lower) load" ?

What's more (Watts more ?) - we know the meaning means little at best. SO it means heating power right ? As in heating up your voice coils until they burn up. People ask me how come I need so much power (Phase Linear 400-2). The speakerds can't tsake it, I have to be alone in the house to use it all because, well, it IS loud. But it's, it's just because it is there. Of ocurse I am having a hell of a time finding fuses for the thing, it calls for eights, I keep finding 7˝s, and then the next one is ten. I could probably get away with tens in there...

But I digress, and gigress, and digress...

SO if we took a sine wave, chopped it into say a thousand pieces time wise, sampled, held and averaged all the instantaneous vaoltages, what owuld we come up with ?

But see I just valled it volts. Why not amps ? The fact is, the egg came first. Not to go into the surrounding issues concerning puultry at the moment, the volts are what push the amps. Since one is depenednt on the other, then if you got "RMS" volts, you aslready go "RMS" amps, whether it averages out or not. But it should. Sine means roundness, or something like that.

All these secantary issues aside (YUK YUK YUK), it seems more and more that this is just somehting someone decided would be the fair way to measure these electrons. Why not PIP or PMP or whatever ? (as long as the rules are the same for everyone). Other countries MUST have had something to do with this, because in the US I KNOW you can convuince people that a "power booster" for your car radio can put out 200 watts per channel, all on a 4 amp fuse to boot !

Now that is soem kickass Yankee engineerin what !

That, umm digression, I feel it comong on again !

I have a JBL powered subwoofer that is no longer powered. I got the power for it. The class D amp within is fried, well doesn't work, so I just hooked it up to a corssover and let er rip[. Well not rip.

At any rate, it is a {SW-D112, 12" with a 250 watt amp. The manual is available on the net for proof, but the thing claims 102 % efficiency. I shit you not. If you cannot find a manual on the net I will put the one I got in dropbox, but that's what it says.

Watt's up with that ?

I jst had to slip that in in memorandium or whatever of my good old dead friend Jim Watt. A Scotsman e was, a tall, very likable sociopath with whom I spent many a day discussion all kinds of groovy things like the revolution and shit. He and his cerowd taught me how to gamble. you know how expensive gambling lessons are ? Damn. And see, he taught me the best thing of all - when to get out of the game. you see people sit at those slot machines for example, until all their money's gone. that is the formula for constant loss. So, I was pretty much in grad school of poker, and I was starting to get my money back. (that's like thre duiploma). I started taking his money, OOOOOO, opne time I had three of sa kind in the hole in seven card stud, and a mate showing. I took about $200 from him with that. Of ocurse everyone else's money was in there as well

Now, what were we talking about ?

Oh yeah, the layman, really, has usually not heard of root, or mean or square since school, unless he is one who works on scinetific of other cool shit. I guess osmneonbe had to blow a whistle or someting because it's damn hard to get anything that resembles 200 watts out of a device the size of a ciugarette pack.

Which brings us to the next, regularly scheduled dogression - the "single ended push pull" output stage. I wanted to call it class T but I found, I guess that was taken already. Fuckers. Anyway, yup, the dealio with the 70 Khz power oscilllator feeding a four quadrant thrysisting typo device, and the the usuaal filter like a class D amp would have. Noting in the linear except in the input stage.

Think we can fir a 200 model of that in a cigarette pack ?

If we did, no cat hair or vomit would be able to get in, which how, in the end, miraculously and for no particular reason, this post is actually on topic.

Whatever that is...

 

So it was pretty much arbitrary then. Seems to be pretty much worldwide though. Unlike other things.

In some places in Europe I am told that they measure their gas mileage backwards. While the US uses MPG which is distance per volume of fuel which means a bigger number is better, they use litres per kilometer.

Who decides these things ? Sometimes it makes sense. Back to amps, THD in percentage, why nmot have "truity", in other words "non-distortion" ? In that case it seems the numbers would not be as meaningful. Like this amp is 99..999% true and this other one is only 99.998% true.

Who makes all these decisions ? Someone knows how to play with numbers. Which way are you looking at it ? Likke they say a robbery happens every so many minutes, yeah well some of those "every so many" minutes or seconds, once the math is done you find out that your odds of getting hit by lightning while naked and smoking a cigar are about twice as good. As if "good" is the right word there...

At any rate, I hear in another country or so, they measure Women in stones and money in pounds. What an odd lot...

Alright, enough of this foolery for now. If I don't find someting to fix or build pretty soon I am going to break someting and go from there. I could get back to work on my power supply.

 

[William Sommerwerck]

wrote in message news:0ec90270-ce92-47b4-85cb-51eacb983733@googlegroups.com...

which brainiac figured out that this "RMS power", whether it
exists or not, was goiulg to beecome the defacto standard
for poqwer amp ratings, favored over PMP or PIP or PIPILS
(Peak Instantaneous Power If Lightnong Strikes) or even volts
for that matter?

An idiot brainiac, who doesn't understand what RMS means (in both the
mathematical and practical senses).

Why not say "this baby can put out 80 volts peak into an eight
ohm (or lower) load" ?

Why not? Perfectly reasonable.


To (not) answer your many reasonable questions... There seems to have been a
time when the heating effect of AC voltage was important. Conventional meters
are respond to the average value of the current fed them, but this doesn't
correspond to the amount of energy the AC power can deliver.

So, it was decided that the RMS value of the power voltage would be measured.
Once obtained, the voltage need only be squared and divided by the load
resistance to get the power.

RMS measurements are explained in any good book on electronics. I'm not going
to waste my time explaining to people who should have learned this stuff
decades ago.

 

[josephkk]

On Sat, 17 May 2014 15:05:26 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

"josephkk" wrote in message
news:nhlfn95affibepc8mr2u3t75o0artuub63@4ax.com...

Root-mean-square is a calculation method based on the mathematical
characteristics of a sine wave.

No, it is not. The RMS value of any repetitive waveform can be calculated. It
is not valid for "any" unit of measure. It refers to the heating effect of
voltage or current -- and nothing else.

Froth at the mouth all you want. RMS is also used to measure acceleration
in vibration testing, both swept sine and random. And that is not the
only other unit where it is applied.

?-)

 

>"Froth at the mouth all you want. RMS is also used to measure acceleration ..."

I do luv me some frothing.

RMS is also used to measure the surface "fineness" of machined parts.

Since we're on that subject anyway...

.... ... ... ... ...

 

[William Sommerwerck]

"josephkk" wrote in message
news:io8ln91v3qn3r0d1fqvpl2ha5elh1m4sqk@4ax.com...

Root-mean-square is a calculation method based on the mathematical
characteristics of a sine wave.

No, it is not. The RMS value of any repetitive waveform can be calculated.
It
is not valid for "any" unit of measure. It refers to the heating effect of
voltage or current -- and nothing else.

Froth at the mouth all you want. RMS is also used to measure
acceleration in vibration testing, both swept sine and random.
And that is not the only other unit where it is applied.

I was talking about electronics. RMS values can be usefully calculated for
many measurements. I believe standard deviation is an RMS value.

 

[josephkk]

On Tue, 20 May 2014 07:23:15 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

"josephkk" wrote in message
news:io8ln91v3qn3r0d1fqvpl2ha5elh1m4sqk@4ax.com...

Root-mean-square is a calculation method based on the mathematical
characteristics of a sine wave.

No, it is not. The RMS value of any repetitive waveform can be calculated.
It
is not valid for "any" unit of measure. It refers to the heating effect of
voltage or current -- and nothing else.

Froth at the mouth all you want. RMS is also used to measure
acceleration in vibration testing, both swept sine and random.
And that is not the only other unit where it is applied.

I was talking about electronics. RMS values can be usefully calculated for
many measurements. I believe standard deviation is an RMS value.

And quite a bit of electronics is vibration tested, not just military
stuff.

RMS is a specific mathematical concept, with many useful applications.
Standard deviation measures something else entirely (second moment of the
distribution; skew and kurtosis measure the third and fourth moments
respectively), and is only in some ways similar to RMS.

?-)

 

So, in the final analysis, RMS rally means "Really Means Shit".

Actually, how could an amp have higher power without testing higher wirh their ill defined standard ? How could we better quantify this ? If they all obey the same rules, the figure is valid.

Fac is, Ohifio came about and blew all the really good shit out the door. Louder, and the USians ate it up. LOUD IS BETTER say the masses.

So dollars per decibel became the law of the land, and the consumer voted for it.

Know what pisses me off ? I missed out on a set of KEF 103.5s for $25 the other day. Man, you need a Lear jet to get some of these deals Those KEFs are plagiued with crossover problems, and I am pretty sure it is bad connections, because what else will stop the woofer from working. Coil unwound itself ? Not hardly, not even softly.

 

[Phoena J.]

On 05/04/2014 03:47 PM, Jeff Liebermann wrote:

Why you don't want the cat to sleep on the nice warm hi-fi amplifier:
http://www.microwaves101.com/content/images/vomit%20fried%20amp/VOMIT%20FRIED%20AMPLIFIER.pdf

I guess the owner of that nice hi-fi amplifier really can't complain.
What I don't understand is why in 2014, people still insist on having
those wretched beasts as pets. If they aren't puking on expensive
amplifiers they are clawing leather couches or knocking over whatever
they can get their filthy paws on. As well as waking you up with their
excessive meowing to go outside or jumping on you while you're in bed,
or hissing and scratching whenever they don't get their way.

I guess people like how they are all warm and they purr. But a cell
fone is also gets warm and can make low frequency vibrations as well. So
unless you have mice running around you're better off just wrapping your
fone in a sock. Not only is it just as cuddily as a cat but it's less
destructive and more obedient.

Please don't mistake me for being a dog lover either. Whenever those
stupid fucks aren't barking at everything, they are chewing up whatever
they forgot to shit on. Not to mention they smell funny especially when
wet.

 

[amdx]

On 7/15/2014 10:32 PM, Phoena J. wrote:

On 05/04/2014 03:47 PM, Jeff Liebermann wrote:
Why you don't want the cat to sleep on the nice warm hi-fi amplifier:
http://www.microwaves101.com/content/images/vomit%20fried%20amp/VOMIT%20FRIED%20AMPLIFIER.pdf




I guess the owner of that nice hi-fi amplifier really can't complain.
What I don't understand is why in 2014, people still insist on having
those wretched beasts as pets. If they aren't puking on expensive
amplifiers they are clawing leather couches or knocking over whatever
they can get their filthy paws on. As well as waking you up with their
excessive meowing to go outside or jumping on you while you're in bed,
or hissing and scratching whenever they don't get their way.

I guess people like how they are all warm and they purr. But a cell
fone is also gets warm and can make low frequency vibrations as well. So
unless you have mice running around you're better off just wrapping your
fone in a sock. Not only is it just as cuddily as a cat but it's less
destructive and more obedient.

Please don't mistake me for being a dog lover either. Whenever those
stupid fucks aren't barking at everything, they are chewing up whatever
they forgot to shit on. Not to mention they smell funny especially when
wet.

WELL SAID! Although I don't agree with your sentiment.
Mikek

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

 

[dave]

On 07/15/2014 08:32 PM, Phoena J. wrote:

On 05/04/2014 03:47 PM, Jeff Liebermann wrote:
Why you don't want the cat to sleep on the nice warm hi-fi amplifier:
http://www.microwaves101.com/content/images/vomit%20fried%20amp/VOMIT%20FRIED%20AMPLIFIER.pdf




I guess the owner of that nice hi-fi amplifier really can't complain.
What I don't understand is why in 2014, people still insist on having
those wretched beasts as pets. If they aren't puking on expensive
amplifiers they are clawing leather couches or knocking over whatever
they can get their filthy paws on. As well as waking you up with their
excessive meowing to go outside or jumping on you while you're in bed,
or hissing and scratching whenever they don't get their way.

They protect me from demons when I'm asleep. They bring me samples of
the local fauna. They laugh at my jokes.

 

[Maynard A. Philbrook Jr.]

In article <lq5kbt$7du$1@dont-email.me>, alex.linder.sucks@gmail.com
says...

On 05/04/2014 03:47 PM, Jeff Liebermann wrote:
Why you don't want the cat to sleep on the nice warm hi-fi amplifier:
http://www.microwaves101.com/content/images/vomit%20fried%20amp/VOMIT%20FRIED%20AMPLIFIER.pdf



I guess the owner of that nice hi-fi amplifier really can't complain.
What I don't understand is why in 2014, people still insist on having
those wretched beasts as pets. If they aren't puking on expensive
amplifiers they are clawing leather couches or knocking over whatever
they can get their filthy paws on. As well as waking you up with their
excessive meowing to go outside or jumping on you while you're in bed,
or hissing and scratching whenever they don't get their way.

I guess people like how they are all warm and they purr. But a cell
fone is also gets warm and can make low frequency vibrations as well. So
unless you have mice running around you're better off just wrapping your
fone in a sock. Not only is it just as cuddily as a cat but it's less
destructive and more obedient.

Please don't mistake me for being a dog lover either. Whenever those
stupid fucks aren't barking at everything, they are chewing up whatever
they forgot to shit on. Not to mention they smell funny especially when
wet.

It just goes to show it's all you and you have no time for anything or
anyone else!

Animals need attention, just like people..

Jamie