Hi, Liz
Where did you go to school?
Which school did you go?
Tony

Mike Graham wrote:

In article , The Lizard wrote:


The BIG WIRE going to the amp supplies EXTRA CURRENT to the amplifiers
POWER SUPPLY. DC to DC power supplies use transformers to efficiently
convert current to voltage. The OUTPUT current of a car audio amp WILL
ALWAYS BE LESS THAN THE INPUT CURRENT!!


Whoa, dude! You're scaring me, now! "DC power supplies use transformers".
No, wait, I'll try that again...

"DC power supplies.... use *transformers*."

Okay, look Lizzie old pal, do you, uh, actually *know* what a tranformer
is? You see... transformers don't *work* with DC. The current needs to be
fluctuating. A DC power supply can't use a transformer. It just *can't*,
and anyway, transformers can't increase power, even with AC (which is what
the audio signal is). All they can do is change it within the limits of
Ohm's law and they exact a small fee according to their efficiency.

Audio amps use special transistors called... audio amps, to amplify an
audio signal. Back when I gave a **** a common chip was the TDA1520A. It
could take a signal from damned near anything and with power hooked up to
it, and a few caps and resistors tucked into the box it could pump out 20W.
These things were used in a lot of televisions and some radios. Nowadays no
doubt you can find monolithic packages that would put a TDA1520A to shame,
but the point is that these chips are one of a huge variety built solely for
the purpose of amplifying audio signals. Open up one of those amplifier
boxes and you will find these chips.


Yes, a voltage doubler can be made with a couple of diodes and
capacitors. But have you ever build one of these?


Yes. Apparently you haven't, though, because a voltage doubler only works
on an AC signal, and outputs DC. Gotcha!

In article ,
Mike Graham wrote:

In article , The Lizard wrote:

The BIG WIRE going to the amp supplies EXTRA CURRENT to the amplifiers
POWER SUPPLY. DC to DC power supplies use transformers to efficiently
convert current to voltage. The OUTPUT current of a car audio amp WILL
ALWAYS BE LESS THAN THE INPUT CURRENT!!

Whoa, dude! You're scaring me, now! "DC power supplies use transformers".
No, wait, I'll try that again...

"DC power supplies.... use *transformers*."

Okay, look Lizzie old pal, do you, uh, actually *know* what a tranformer
is? You see... transformers don't *work* with DC. The current needs to be
fluctuating. A DC power supply can't use a transformer. It just *can't*,
and anyway, transformers can't increase power, even with AC (which is what
the audio signal is). All they can do is change it within the limits of
Ohm's law and they exact a small fee according to their efficiency.

Audio amps use special transistors called... audio amps, to amplify an
audio signal. Back when I gave a **** a common chip was the TDA1520A. It
could take a signal from damned near anything and with power hooked up to
it, and a few caps and resistors tucked into the box it could pump out 20W.
These things were used in a lot of televisions and some radios. Nowadays no
doubt you can find monolithic packages that would put a TDA1520A to shame,
but the point is that these chips are one of a huge variety built solely for
the purpose of amplifying audio signals. Open up one of those amplifier
boxes and you will find these chips.

Yes, a voltage doubler can be made with a couple of diodes and
capacitors. But have you ever build one of these?

Yes. Apparently you haven't, though, because a voltage doubler only works
on an AC signal, and outputs DC. Gotcha!

You guys are funny.

Half of the power semiconductors in a car audio amp are usually
dedicated to the power supply. There absolutely are power transformers
in there. Ususally it's one or more toroidial transformers with center
taps on both sides. The primary center tap is connected to +12V. The
other primary connections are driven by MOSFETs in opposing phase. The
center tapped secondary is rectified through fast recovery diodes into a
split power supply of +/- 30 volts or so.

As for amplifier chips... They're seldom used. They need the emitter
coupling power resistors, the bootstrap power supply, the bias control,
the negative feedback circuits, the output filters, etc., etc. They end
up being as much trouble as discrete components but with reduced
performance. Being 2 volts short of reaching the power rails is a big
deal in car audio amps.

Mike Graham wrote:
In article , The Lizard wrote:


BINGO! That's because amperes law doesn't define the "strength" of a
magnetic field, it just predicts it's density.


Dude, your ass is sucking wind. Really.


Your preoccupation with sucking asses is disturbing.

Density is the whole deal. The denser the field the stronger the magnet
is, all other things being equal. Add coils or increase the amperage and
you get a stronger solenoid. If you want to try to argue that then find a
contrary reference from a reputable source.

Add coils...gee...with what we know of Kirchoffs law, what do you think
adding coils does?

And you can't arbitrarily increase current. That's what I've been trying
to explain ya dumb****. Current is a function of a voltage across a
resistance. To increase current, you need to either UP the voltage, or
DROP the resistance.

When you're through sucking ass, you might want to pick up a physics book.

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Mike Graham wrote:
In article , The Lizard wrote:


The BIG WIRE going to the amp supplies EXTRA CURRENT to the amplifiers
POWER SUPPLY. DC to DC power supplies use transformers to efficiently
convert current to voltage. The OUTPUT current of a car audio amp WILL
ALWAYS BE LESS THAN THE INPUT CURRENT!!


Whoa, dude! You're scaring me, now! "DC power supplies use transformers".
No, wait, I'll try that again...

"DC power supplies.... use *transformers*."


You're about a dumb ****ing illiterate to start with. I wrote "DC to DC
power supplies".

A DC to DC power supply takes a DC input and provides a DC output. That
much, I assume, your simple little brain can handle. But here comes the
real complicated part: You ever wonder how voltage is stepped up or
stepped down in an amp? It's done by using a circuit to pulse DC through
a transformer, which then steps the voltage up. On the other side, an AC
current is rectified to give a DC to DC output.

Now it does go on to get more complicated than that, but you can't even
handle reading with too much skill, so I will save you the embarrasment
of getting completely lost with concepts like "feedback", "pulse width
modulation", and "switched-mode".

Okay, look Lizzie old pal, do you, uh, actually *know* what a tranformer
is? You see... transformers don't *work* with DC.

Actually, they do. A transformer - or "inductor" - can be put in series
with an electrical circuit to smooth out ripples in voltage. That is
because coils resist changes in electrical current.


The current needs to be
fluctuating.

Fluctuating current does not mean it is Alternating Current. For a
current to be alternating, it must change polarity at some point along
its waveform. Fluctuatin current can be an AC signal with a DC offset
such as that polarity never changes.

I hope you're taking notes, because I get snippy when I have to repeat
myself to noobie morons like you.

A DC power supply can't use a transformer. It just *can't*,
and anyway, transformers can't increase power, even with AC (which is what
the audio signal is). All they can do is change it within the limits of
Ohm's law and they exact a small fee according to their efficiency.

Whoever said they could increase power? You're pulling **** out of your
ass here, which just goes to demonstrate your pitiful reading
comprehension skills. I certainly never said it - I know better.

Audio amps use special transistors called... audio amps, to amplify an
audio signal.

You mean "operational amplifiers", retard. Newsflash: op amps cannot
handle the current needed to drive speakers at the wattage levels we're
dealing with. Almost without exception, the operational amplifiers in a
car audio amps are used for signal processing. The actual output stage
on any decent amplifier is comprised of discreet componants.

Have you ever seen the inside of an amp?


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Tony Hwang wrote:
Hi, Liz
Where did you go to school?
Which school did you go?

Hey Tony, a few tips for you:

1. Shut the **** up and learn English.
2. Solid State Devices are not always current driven. You still
haven't apologized for this stupid mistake.
3. Don't comment on second hand sources, and Mikey-boy here is
VERY second hand.


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Tony Hwang wrote:

Hi, Liz
Let me see some of your credentials.
In math and science,

Hey Buddy!

Liz is *GREAT* in math!



He used to be a change boy in a laundromat!!!
(till he got fired)

Tony Hwang wrote:

But your basic electronics knowledge sucks.

You're the one who said "SSD are current driven", which is patently
false. It seems to me, you either need to a) work on your English
skills, or learn something of basic electronics.

There's nothing wrong with my electronics knowledge. What you need to do
is come to the realization that because YOUR ENGLISH SUCKS, you don't
understand what I'm saying. I've watched you try to correct a number of
people and not actually address anything they've said.

In math and science, language is not much important.

WRONG! If you cannot even communicate, then you cannot relay your
understanding of concepts...as evidenced by how much you sound like a
blithering idiot.

So what other language do you understand other than English?

French, some spanish, some german, and some arabic. Just enough to kill
people though.

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JL Grasso wrote:

Don't forget ****wit! You're apparently fluent in that!

Yeah, but until ****wit is a recognized language, it's really not worth
mentioning.

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need i remind you all

Winning an arguement online is like running in the special olympics, even if
you win, your still retarted




"JL Grasso" wrote in message
...
On Sat, 26 Jul 2003 11:11:15 -0400, The Lizard
wrote in rec.audio.car:

JL Grasso wrote:

Don't forget ****wit! You're apparently fluent in that!

Yeah, but until ****wit is a recognized language, it's really not worth
mentioning.

Well, no sense keeping your light under a bushel!


Jerry
need i remind you all

Winning an arguement online is like running in the special olympics, even if
you win, your still retarted




"JL Grasso" wrote in message
...
On Sat, 26 Jul 2003 11:11:15 -0400, The Lizard
wrote in rec.audio.car:

JL Grasso wrote:

Don't forget ****wit! You're apparently fluent in that!

Yeah, but until ****wit is a recognized language, it's really not worth
mentioning.

Well, no sense keeping your light under a bushel!


Jerry

Winning an arguement online is like running in the special olympics, even if
you win, your still retarted



Aww yes, much like driving a Honda

Les