Chip with simple program for Toy

[Phil Allison]

"Daniel Mandic"


** Total nutter .....

Or sock-puppet ?



...... Phil

 

[Phil Allison]

"Daniel Mandic"


** Total nutter .....

Or sock-puppet ?



...... Phil

 

[Richard Seriani]

<timho_au@yahoo.com.au> wrote in message
news:513d4276-b8a4-4c77-97a8-a90e93536b39@s37g2000prg.googlegroups.com...

I bought some electrical sensitive equipment from overseas which runs
on 220v. I tried to run it on 240v in Australia and some of the
resistors have been burned. I know it will damage the equipment to run
on 240v but cannot find a transformer to convert from 240v to 220v.

Any advice on this?

Thank you.

Use an autotransformer.

 

[Richard Seriani]

<timho_au@yahoo.com.au> wrote in message
news:513d4276-b8a4-4c77-97a8-a90e93536b39@s37g2000prg.googlegroups.com...

I bought some electrical sensitive equipment from overseas which runs
on 220v. I tried to run it on 240v in Australia and some of the
resistors have been burned. I know it will damage the equipment to run
on 240v but cannot find a transformer to convert from 240v to 220v.

Any advice on this?

Thank you.

Use an autotransformer.

 

[Bob Eld]

<mrdarrett@gmail.com> wrote in message
news:8b5083e5-4d3e-4117-86d6-a3213396f804@s39g2000prd.googlegroups.com...

Are they serious?

http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"

10% THD sounds like a lot.

Michael

It is a lot. Most likely a misprint. Nobody in their right mind would spec.
an amplifier with that distortion nor would they rate an amplifier at its
clipping level as has been suggested.

Since getting less than one percent even less than 0.1% THD is trivial these
days with modern semiconductor circuitry it would seem that this spec sheet
is probably in error.

Most likely the printer or web master left out a decimal point and nobody
caught it. Call JVC and ask.

 

[Bob Eld]

<mrdarrett@gmail.com> wrote in message
news:8b5083e5-4d3e-4117-86d6-a3213396f804@s39g2000prd.googlegroups.com...

Are they serious?

http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"

10% THD sounds like a lot.

Michael

It is a lot. Most likely a misprint. Nobody in their right mind would spec.
an amplifier with that distortion nor would they rate an amplifier at its
clipping level as has been suggested.

Since getting less than one percent even less than 0.1% THD is trivial these
days with modern semiconductor circuitry it would seem that this spec sheet
is probably in error.

Most likely the printer or web master left out a decimal point and nobody
caught it. Call JVC and ask.

 

[petrus bitbyter]

<timho_au@yahoo.com.au> schreef in bericht
news:513d4276-b8a4-4c77-97a8-a90e93536b39@s37g2000prg.googlegroups.com...

I bought some electrical sensitive equipment from overseas which runs
on 220v. I tried to run it on 240v in Australia and some of the
resistors have been burned. I know it will damage the equipment to run
on 240v but cannot find a transformer to convert from 240v to 220v.

Any advice on this?

Thank you.

Are you sure you did not use 60Hz equipment in a 50Hz environment?

petrus bitbyter

 

[David L. Jones]

<mrdarrett@gmail.com> wrote in message
news:07ffb95e-3697-4dc3-b496-f571730803c8@u36g2000prf.googlegroups.com...

When playing a DVD with a regular player, there are typically only
Left and Right audio channels.

No. Even the cheapest $25 DVD players have a coaxial and/or optical surround
sound output connection (for Dolby Digital or DTS surround sound).

I understand that these outputs can be
fed from a DVD player to a surround-sound receiver that somehow
demultiplexes the audio signals into the respective speakers (front
right, front left, rear right, ...)

You have to use the surround sound output connection, not the left/right
channel output.

There are also surround sound receivers/amplifiers with a built-in DVD
player.

Would the surround sound receivers/amplifiers with built-in DVD player
more accurately re-create the sound into the 4+ speakers?

No, just use a normal DVD player and a normal surround sound receiver.

Or is a regular DVD player with Left/Right channels feeding the
surround sound receiver just as good?

No, not nearly as good.

Dave.

 

[David L. Jones]

<mrdarrett@gmail.com> wrote in message
news:07ffb95e-3697-4dc3-b496-f571730803c8@u36g2000prf.googlegroups.com...

When playing a DVD with a regular player, there are typically only
Left and Right audio channels.

No. Even the cheapest $25 DVD players have a coaxial and/or optical surround
sound output connection (for Dolby Digital or DTS surround sound).

I understand that these outputs can be
fed from a DVD player to a surround-sound receiver that somehow
demultiplexes the audio signals into the respective speakers (front
right, front left, rear right, ...)

You have to use the surround sound output connection, not the left/right
channel output.

There are also surround sound receivers/amplifiers with a built-in DVD
player.

Would the surround sound receivers/amplifiers with built-in DVD player
more accurately re-create the sound into the 4+ speakers?

No, just use a normal DVD player and a normal surround sound receiver.

Or is a regular DVD player with Left/Right channels feeding the
surround sound receiver just as good?

No, not nearly as good.

Dave.

 

[BobW]

"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in message
news:uqnpv3lvj8n6h3vvhv1dbijcri4ajcfegt@4ax.com...

On Wed, 9 Apr 2008 08:07:10 -0700 (PDT), root114@gmail.com wrote:

1.5 Inch high quality Mini Digital Photo Frame with TF card slot for
up to an amazing 2GB memory. This low cost Digital Frame has a built
in speaker and earphone jack letting you play MP3 music files. This is
a nice little gadget that will let you store your pictures and listen
to music at the same time, and comes with Seriouswholesale no MOQ and
Warrantee Policy.


Welcome to http://www.seriouswholesale.com.


And it comes with wonderful Chinese bonus software!

http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/02/15/BU47V0VOH.DTL&type=business

John

What in the fugg is up with these Chinese sobs? What did we ever to do them?
I seem to recall that we helped relieve them from Japanese aggression, in
WW2.

They don't respect us
So let's surprise 'em
We'll drop the big one
And pulverize 'em

Bob

 

[BobW]

"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in message
news:uqnpv3lvj8n6h3vvhv1dbijcri4ajcfegt@4ax.com...

On Wed, 9 Apr 2008 08:07:10 -0700 (PDT), root114@gmail.com wrote:

1.5 Inch high quality Mini Digital Photo Frame with TF card slot for
up to an amazing 2GB memory. This low cost Digital Frame has a built
in speaker and earphone jack letting you play MP3 music files. This is
a nice little gadget that will let you store your pictures and listen
to music at the same time, and comes with Seriouswholesale no MOQ and
Warrantee Policy.


Welcome to http://www.seriouswholesale.com.


And it comes with wonderful Chinese bonus software!

http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/02/15/BU47V0VOH.DTL&type=business

John

What in the fugg is up with these Chinese sobs? What did we ever to do them?
I seem to recall that we helped relieve them from Japanese aggression, in
WW2.

They don't respect us
So let's surprise 'em
We'll drop the big one
And pulverize 'em

Bob

 

[Phil Allison]

"BobG"


** Hey Bob,

take a breath - you are not talking about the same topic as others here !!

Peak clipping ( = hard clipping ) of a CONTINUOUS sine wave is VERY audible,
even at low percentages. The harmonics generated go up to 5, 7, 9 and 11
times the fundamental - if they fall in the range of 1 to 5 kHz their
presence is obvious us to anyone who is not deaf.

OTOH - occasional transient clipping of a music or speech signals is
virtually inaudible, specially if each clipping event is under 2mS
duration. Such occasional transients may be clipped at high percentages of
their unclipped amplitude and still remain hidden to listeners.

Some power amplifiers have fast acting signal clipping indicators ( ie the
Crown IOC system) and it is easily demonstrated that the LED clipping light
will flicker regularly on normal music program WELL before any listener
can hear a problem.




...... Phil

 

[Phil Allison]

"BobG"

** Hey Bob,

take a breath - ?you are not talking about the same topic as others here
!!
==============================================

I claimed that one cannot see 3% distortion in a sine wave on a scope.

** But you can see 3 % clipping distortion.

The tops of the sine wave are flattened and in most cases 100 / 120 Hz
power supply ripple becomes visible too.

I got a response that this is utter nonsense,

** Which it is - in the context of this thread.

and its easy to see 1%THD on a scope.

** Which it IS when the distortion is hard clipping of a pure sine wave.


You are now off on a tangent all your own.

Take your lunch and a warm jumper.

It may get cold and lonely.



...... Phil

 

[Richard Crowley]

"Green Xenon [Radium]" wrote ...

My favorite analog audio storage medium consist of the optical equivalent
of magnetic tape.....

Which would be remarkable if ANYONE reading this throught
you even knew what a variable density optical track was, or
that you had ever seen one. You have clearly never HEARD
one or even you wouldn't make such a silly statment.

How about sending your random thoughts to some new
newsgroups. Expand your horizons. You're old-hat here.

 

[Richard Crowley]

"Green Xenon [Radium]" wrote ...

What makes you think I've never heard music from a variable density
optical track?

Your statement above is what makes me think you don't know
what you're talking about.

OTOH, When was the last time you had your ears tested?

 

[Arny Krueger]

"Green Xenon [Radium]" <glucegen1@excite.com> wrote in
message news:47fd6ce6$0$6158$4c368faf@roadrunner.com

Hi:

My favorite analog audio storage medium consist of the
optical equivalent of magnetic tape. It is similar to the
optical tracks of old analog B&W films -- except without
the video or any images. My optical tape records audio
optically on a tape using variable-density encoding [not
variable-area] and is monaural. As with any photography,
the tape must not be exposed to light before recording or
development and must not be exposed to extraneous light
[light other than the optical audio signal] during or
before recording/development. Such exposure will corrupt
the film. After recording. The film is developed using
photographic chemicals. This tape is like a reel-to-reel
[i.e. not a cassette] film using optics and chemistry
instead of magnetism.

A close, long-time friend used to be one of the go-to guys in this city for
optical transfers. Detroit used to be a center for the production of
training films (now on video), so this was a very non-trivial business at
the time.

There is no doubt in his mind, or the minds of almost anybody who
understands electronic media, that optical sound is rife with daunting
technically challenges and unresolved issues. It was a major stumbling block
to sound quality in the theatre even in the late 1930s.

 

[Arny Krueger]

"Green Xenon [Radium]" <glucegen1@excite.com> wrote in
message news:47fd6ce6$0$6158$4c368faf@roadrunner.com

Hi:

My favorite analog audio storage medium consist of the
optical equivalent of magnetic tape. It is similar to the
optical tracks of old analog B&W films -- except without
the video or any images. My optical tape records audio
optically on a tape using variable-density encoding [not
variable-area] and is monaural. As with any photography,
the tape must not be exposed to light before recording or
development and must not be exposed to extraneous light
[light other than the optical audio signal] during or
before recording/development. Such exposure will corrupt
the film. After recording. The film is developed using
photographic chemicals. This tape is like a reel-to-reel
[i.e. not a cassette] film using optics and chemistry
instead of magnetism.

A close, long-time friend used to be one of the go-to guys in this city for
optical transfers. Detroit used to be a center for the production of
training films (now on video), so this was a very non-trivial business at
the time.

There is no doubt in his mind, or the minds of almost anybody who
understands electronic media, that optical sound is rife with daunting
technically challenges and unresolved issues. It was a major stumbling block
to sound quality in the theatre even in the late 1930s.

 

[Bob Masta]

On Tue, 8 Apr 2008 20:35:10 -0700 (PDT), mrdarrett@gmail.com wrote:

Are they serious?

http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"

10% THD sounds like a lot.

Michael

For most modern amp designs, the curve of distortion versus power
output at 1 kHz looks like a lopsided valley: At very low outputs,
there is moderate crossover distortion, which essentially is a
fixed-size discontinuity near zero so it becomes a smaller percentage
of the total at output power rises. So distortion decreases linearly
until some mid-power region (1-10 watts, say). Then as you continue
to increase power, you soon hit a point where the distortion starts to
rise rapidly with power, as you get near to (and into) clipping. (The
distortion can rise before the signal actually hits the hard clip
point, beacuse near clipping the amp's negative feedback has less
elbow room to work its magic.)

At any rate, the manufacturer has to make a judgement call about
what power level to claim. He can pick a high level if he thinks the
customer will be impressed by watts and not know or care about
distortion. Or he can pick a lower power and correspondingly lower
distortion to appeal more to purists. (The ability of the amp to
withstand the power without damage is not typically an issue here.
Amps dissipate the most power at intermediate levels.)

As others have pointed out, music often has transient peaks that
can be clipped a fair amount before they become objectionable.
When the signal level is set so that the tallest peaks are just
hitting the 100W point, the average power is probably more like
10W or less, with correspondingly low distortion. And for most
speaker systems, this will be *plenty* loud!

Best regards,


Bob Masta

DAQARTA v3.50
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, FREE Signal Generator
Science with your sound card!

 

[Bob Masta]

On Tue, 8 Apr 2008 20:35:10 -0700 (PDT), mrdarrett@gmail.com wrote:

Are they serious?

http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"

10% THD sounds like a lot.

Michael

For most modern amp designs, the curve of distortion versus power
output at 1 kHz looks like a lopsided valley: At very low outputs,
there is moderate crossover distortion, which essentially is a
fixed-size discontinuity near zero so it becomes a smaller percentage
of the total at output power rises. So distortion decreases linearly
until some mid-power region (1-10 watts, say). Then as you continue
to increase power, you soon hit a point where the distortion starts to
rise rapidly with power, as you get near to (and into) clipping. (The
distortion can rise before the signal actually hits the hard clip
point, beacuse near clipping the amp's negative feedback has less
elbow room to work its magic.)

At any rate, the manufacturer has to make a judgement call about
what power level to claim. He can pick a high level if he thinks the
customer will be impressed by watts and not know or care about
distortion. Or he can pick a lower power and correspondingly lower
distortion to appeal more to purists. (The ability of the amp to
withstand the power without damage is not typically an issue here.
Amps dissipate the most power at intermediate levels.)

As others have pointed out, music often has transient peaks that
can be clipped a fair amount before they become objectionable.
When the signal level is set so that the tallest peaks are just
hitting the 100W point, the average power is probably more like
10W or less, with correspondingly low distortion. And for most
speaker systems, this will be *plenty* loud!

Best regards,


Bob Masta

DAQARTA v3.50
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, FREE Signal Generator
Science with your sound card!

 

[Phil Allison]

"Bob Masta"

For most modern amp designs, the curve of distortion versus power
output at 1 kHz looks like a lopsided valley: At very low outputs,
there is moderate crossover distortion, which essentially is a
fixed-size discontinuity near zero so it becomes a smaller percentage
of the total at output power rises. So distortion decreases linearly
until some mid-power region (1-10 watts, say).

** Totally false !!!!!!!!!!!!!!!!!

The characteristic rise in published THD curves at power levels below about
1 watt is almost * entirely * due to supply frequency hum and wide band
random noise.

NOT any mysterious x-over region effects !!!!!!!!!!

The general definition of THD *** includes *** hum and noise - which
tends to be a fixed level at all power outputs.
So the PERCENTAGE increases the signal level reduces !!!

Obvious - right ?

At any rate, the manufacturer has to make a judgement call about
what power level to claim.

** Bollocks.

The typical power output difference between the 0.1% THD level and 0.01%
THD level is trivial for the majority of hi-fi quality SS amps. Maybe 102
watts as compared to 100 watts.

Only by doing THD measurements on * real amplifiers * can one have any
insight into the facts of the matter .

Which I do all the time.

While Bob does not.



....... Phil