PRC as a amplifier in GPS question.

[Phil Allison]

"Trevor Wilson" <trevor@rageaudio.com.au> wrote in message
news:3f418d91$1@news.comindico.com.au...

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f41885b$0$6526$afc38c87@news.optusnet.com.au...

"Trevor Wilson" <trevor@rageaudio.com.au> wrote in message
news:3f418019$1@news.comindico.com.au...


**Of course. Why would you expect to hear a difference? The links
supplied
are nickel plated brass. Entirely adequate (as long as they are clean)
for
the job.


** What about the Nickel Oxide ???

Or is that a good conductor too ?

**Focus on the words:

** I focus in on the meaning - you should try that sometime.


............ Phil

 

[Dean]

"Trevor Wilson" <

Is
it just more HiFi bullshit ?

**It sure is.

I think my favourite bit of HiFi bullshit is a special wall socket ( to plug
the your amp mains plug into ) supposed to be made of special low
temperature treated materials that will ' clean up and align the electrons '
of that nasty dirty mains electricity that might have been through
those...eh...cheap HiFi systems before you get it. Still, I guess someone
must buy 'em. I would !

Dean.

 

[Rex Turner]

Thanks all for help - will be contacting Digikey very soon..
Amazed at price difference from one supplier to another...
RexT.

"Rex Turner turner@bigpond.net.au>" <r<dot> wrote in message
news:kc_%a.41285$bo1.32887@news-server.bigpond.net.au...

I have a need for an on-board carburettor balance device for a twin
cylinder
motorcycle.
Proposed design is one sensor (differential) coupled to both carbies,
driving a bargraph display with zero centre.
Question - which sensor to use and where in Oz can one get these.
(need to keep cost down)
TIA,
RexT.

 

[gcd]

Hi all,
it's all about damping factor.

2 - 3inches of copper track on a pcb adds VERY little resistance (
impedance) and will not dissipate excessive power, whereas 10 - 15 ft of
cable if not a reasonable gauge will add resistance to the circuit and
dissipate (significant) power.

Your typical amp will be less than an ohm output impedance. any extra
resistance will affect the damping factor on the load. This will affect the
frequency response of the speaker and will affect how it sounds. Typical
result..... "boomy" bass

Given that, use 20 - 16 gauge and you're not likely to have any problems.

OFC? what a waste of money.

Want to be a real purist? well what about all those dissimilar metal
junctions eh? that diode action surely has to be introducing some
distortion, there are so many of them in the system not to have an effect.!!

Cheers
Greg


"Jon" <gremlin@fastmail.fm> wrote in message
news:3f419d0f@news.alphalink.com.au...

Of course you would need to "see" any change on an oscilloscope.
Gold is the way to go!
After seeing all the gold plated connecters on car amps and equalisers,
they'll have to go a long way to convince me that anything less than ideal
is ideal.
You have been conned.
You also need 4 inch thick speaker wires etc.
While you wont notice it much, you'll make the sales team and amplifier
very
happy.
"Russ" <russell@remove.thehovel.net> wrote in message
news:3f4187ad@iridium.webone.com.au...

"Dean" <dbd@cyllene.uwa.edu.au> wrote in message
news:bhrt9t$unp$1@enyo.uwa.edu.au...

And if anyone is familiar with the C370, they will know of the
incredibly
pissy links they supply to couple the preamp to the main input. I've
replaced those with 'propper' very short interconnects on very stern
advice - and I can barely notice any difference !

If you open up your amplifier and look at the PCB you'll see they use
outrageously thin copper tracks all over the place. Clearly NAD need
some
stern advice on need for audiophile-quality interconnects between *all*
components. I'm not sure about NAD, but I get the impression a lot of
manufacturers are getting away without using OFC copper on their
component
leads.

Of course "I can barely notice any difference" is the operative phrase
here.
If you actually want to see the difference, observe the contents of your
wallet before and after acting on "stern advice".

Russ.

 

Thanks for all the help, I will have to check into the LM regulator and go from there. National Semiconductor
seems to be a dead end all my emails basically say there have no info on it at all, period, zilch, etc

anyways, thanks again.

Tim

not@home.com> wrote in message
news:a2j1kvstpalc4so3mvo0ie7eces6smmktk@4ax.com...

Can anyone help with this:

It is in a T0-220 package (of sorts - 5 leads coming from the bottom vs 3)
and has the following markings:

old National semiconductor logo 8612
1573
REL

Used in a LCD display board (Hitachi HD44790 driver) and some sort of
'flash rom' (NCR 52801).
Power supplied: 12v to pin 1 and 5v to pin 5 of the device in question.
There is no display (will not turn on).

National Semiconductor has been of no help.

thanks for any help or cross reference to it.
Tim

Almost certainly a switching regulator IC, LM1573, similar to the LM1575
family, though I can't find that exact number.
http://www.national.com/ds/LM/LM1575.pdf for reference. You may be able to
trace out the circuit and see if it operates similarly.

Ken

 

[Demosthenes]

Well I would like a ready made unit if possible - but 'Krane' turned up
nothing on Google..

Any suggestions anyone?

I don't have much electronics experience - although I have a soldering
iron

Larry Hatch wrote:

Demosthenes wrote:

Hi,

I live in Adelaide.. I want to rig up a FM stereo transmitter or two
to computers in the house so they can work as jukeboxes to a stereo in
the bathroom, etc - is this possible? On the cheap?

Thanks!


I bought a unit for our boat recently, it was buy KRANE I think. It has
a pot inside, you turn up and it made the distance I needed with no
problems. About 75 feet through all the electronics.

 

[Demosthenes]

Well I would like a ready made unit if possible - but 'Krane' turned up
nothing on Google..

Any suggestions anyone?

I don't have much electronics experience - although I have a soldering
iron

Larry Hatch wrote:

Demosthenes wrote:

Hi,

I live in Adelaide.. I want to rig up a FM stereo transmitter or two
to computers in the house so they can work as jukeboxes to a stereo in
the bathroom, etc - is this possible? On the cheap?

Thanks!


I bought a unit for our boat recently, it was buy KRANE I think. It has
a pot inside, you turn up and it made the distance I needed with no
problems. About 75 feet through all the electronics.

 

[Andy]

"gcd" <gcdnoSPAM@austarmetro.com.au> wrote in message news:<3f41f2c6@news.comindico.com.au>...

Hi all,
it's all about damping factor.

2 - 3inches of copper track on a pcb adds VERY little resistance (
impedance) and will not dissipate excessive power, whereas 10 - 15 ft of
cable if not a reasonable gauge will add resistance to the circuit and
dissipate (significant) power.

Your typical amp will be less than an ohm output impedance. any extra
resistance will affect the damping factor on the load. This will affect the
frequency response of the speaker and will affect how it sounds. Typical
result..... "boomy" bass

Given that, use 20 - 16 gauge and you're not likely to have any problems.

OFC? what a waste of money.

Want to be a real purist? well what about all those dissimilar metal
junctions eh? that diode action surely has to be introducing some
distortion, there are so many of them in the system not to have an effect.!!

Cheers
Greg

Greg,

You have to catch up with the latest in technology for "pure" sound -
use a device that does away with the
dissimilar-metal-semiconductor-technology - a valve!!!! (vacuum tube).
Have you been hiding under a rock? This technology is the latest and
greatest!. I have not yet seen a car mega-watt audio amplifier using
this new technology yet but I am sure that someone has made one or is
currently working on it - I reckon they will make mega-bucks! 21st
Century technology doesn't come cheap you know ;-)

Andy

<snip>

 

[Jon]

Shades of Terminator
"Stuart Anderson" <stuart.andersonNOSP@Moptushome.com.au> wrote in message
news:3f3eed71$0$10355$afc38c87@news.optusnet.com.au...

I've always wanted to get one of these implanted in my arm... the
ultimate
keyless entry system

Like all foreign bodies there is a good chance that such a device will
migrate around the body causing all sorts of fun. In humans, the devices
are
implanted in the hand in the meat between the thumb and first finger (from
memory). They are popular in south america where kidnappings are rife - in
addition to data about the person they also contain a GPS unit.

The problem is that if I want to break in, I need your arm. Now where's my
machete?

 

[Tony Pearce]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f419ccf$0$6527$afc38c87@news.optusnet.com.au...

"Trevor Wilson" <trevor@rageaudio.com.au> wrote in message
news:3f418d91$1@news.comindico.com.au...

**Focus on the words:
" Entirely adequate (as long as they are clean) for the job."
^^^^^^^^^^^^^^^^^^^

** I focus in on the meaning - you should try that sometime.

And what meaning did YOU derive from those words, and whose fault is that?


TonyP.

 

[Tony Pearce]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f422566$0$15131$afc38c87@news.optusnet.com.au...

Solder and tin ? Tin and copper ?
These are alloy junctions and have no non- linear effects.

Better do some research on the thermo-electric effect of dissimilar metals.
Cadmium based solder is sometimes used for low thermal applications.

TonyP.

 

[Phil Allison]

"Tony Pearce" <TonyP@hotmail.com> wrote in message
news:3f431b80$0$28120$afc38c87@news.optusnet.com.au...

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f419ccf$0$6527$afc38c87@news.optusnet.com.au...

"Trevor Wilson" <trevor@rageaudio.com.au> wrote in message
news:3f418d91$1@news.comindico.com.au...

**Focus on the words:
" Entirely adequate (as long as they are clean) for the job."
^^^^^^^^^^^^^^^^^^^

** I focus in on the meaning - you should try that sometime.


And what meaning did YOU derive from those words,

** None - since TW said it it means nothing at all.



........... Phil

 

[Phil Allison]

"Tony Pearce" <TonyP@hotmail.com> wrote in message
news:3f431d9d$0$28118$afc38c87@news.optusnet.com.au...

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f422566$0$15131$afc38c87@news.optusnet.com.au...
Solder and tin ? Tin and copper ?
These are alloy junctions and have no non- linear effects.

Better do some research

** Better stick your head uop a dead bear's bum Trevor


on the thermo-electric effect of dissimilar metals.


** That ain't audio band non- linearity - Trevor ..




........... Phil

 

[Trevor Wilson]

"Dean" <dbd@cyllene.uwa.edu.au> wrote in message
news:bhvcv1$g0b$1@enyo.uwa.edu.au...

There has been a bit of a stoush going on ( caused by me again, sorry )
about the thermoelectric effects caused by using plated connectors in HiFi
systems. I offer my own piss poor knoweledge of the subject for others to
laugh at... Firstly, even if you are generating a DC offset at the
connector
junction, aren't the inputs to audio systems AC coupled anyway ?

**Not necessarily. Primitive equipment may be AC coupled, but more modern
designs are not.

Secondly,

the Seebeck effect ( which is the principle behind thermocouples )
requires
a temperature difference to occur. Several hundred degrees is needed to
produce a few tens of millivolts and unless your amp was designed by me,
its
unlikely to glow enough to cause thermoelectric emf's worth worrying
about.
And finally, in case there's any wee wee still left in your bladders, a
gold
plated steel plug going into a gold plated steel socket is still a gold to
gold junction - although I admit there still must be other dissimilar
metal
junctions such as solder to copper etc.

**Sure, but there is no evidence to suggest it makes any difference.

Dean
( still doesn't understand those FET thingies )

**Think of a Voltage controlled, variable resistor.


--
Trevor Wilson
www.rageaudio.com.au

 

[Ben Pope]

Davo wrote:

Hello,

I am looking for active newsgroups, productive user friendly
tutorials, good weblinks, and local private tutors (Melbourne
Australia) in the programming language C. The two news groups
athome.aus.programming and athome.aus.programming.c++ dont seem to
have much activity. Any information or advice will be much
appreciated.

Do you want to go with c or c++?

I haven't found much on c, but that hasn't bothered me since I'm already
quite happy with Java and programming in general.

If you want to go with c++, I've found "Accelerated C++" by Koenig and Moo
to be a nice approach.

Have you done any programming before?

Ben
--
I'm not just a number. To many, I;m known as a String...

 

[gcd]

Hi all,
I was being facetious as the effect is rather small

However there is with every dissimilar metal junction, diode action. And yes
it is normally exploited in thermocouples and yes the effect is worse when
corrosion exists.

The effect is worse between metal groups rather than within metal groups.
ie the effect is much less between copper and gold as opposed to say copper
and aluminium or copper and magnesium - that's about as far as my hsc
chemistry goes

Cheers
Greg


"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f422566$0$15131$afc38c87@news.optusnet.com.au...

"gcd" <gcdnoSPAM@austarmetro.com.au> wrote in message
news:3f41f2c6@news.comindico.com.au...


Want to be a real purist? well what about all those dissimilar metal
junctions eh?


** What do you mean cgd ??

Solder and tin ? Tin and copper ?

These are alloy junctions and have no non- linear effects.

PCB multipin connectors use the same plated metals for male and
female pins.

RCA plugs and sockets are nearly all nickel plate over brass .

Or were you being *very clever* and referring to all the junctions
between P and N type silicon ???




........... Phil

 

[Phil Allison]

"gcd" <gcdnoSPAM@austarmetro.com.au> wrote in message
news:3f43499b@news.comindico.com.au...

Hi all,

I was being facetious as the effect is rather small

However there is with every dissimilar metal junction, diode action.

** Not so - just because a voltage generator exists does not equate to
a non linear conductor.

Eg A battery is a voltage source - but can pass an AC signal perfectly
when connected in circuit.

it is normally exploited in thermocouples and yes the effect is worse when
corrosion exists.

** Now oxides and sulphides are another matter.

Copper oxide was used as a rectifier prior to selenium and silicon
rectifiers.

But that is no longer a metal to metal junction.




................. Phil

 

[The real Andy]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f431e98$0$28117$afc38c87@news.optusnet.com.au...

"Tony Pearce" <TonyP@hotmail.com> wrote in message
news:3f431d9d$0$28118$afc38c87@news.optusnet.com.au...

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f422566$0$15131$afc38c87@news.optusnet.com.au...
Solder and tin ? Tin and copper ?
These are alloy junctions and have no non- linear effects.

Better do some research


** Better stick your head uop a dead bear's bum Trevor


on the thermo-electric effect of dissimilar metals.


** That ain't audio band non- linearity - Trevor ..

If you live in melbourne it could be in the audio band....

 

[geo]

"Davo" <dgwood@optushome.com.au> wrote in message
news:3f433abc$0$10359$afc38c87@news.optusnet.com.au...

Hello,

I am looking for active newsgroups, productive user friendly tutorials,
good
weblinks, and local private tutors (Melbourne Australia) in the
programming
language C. The two news groups athome.aus.programming and
athome.aus.programming.c++ dont seem to have much activity. Any
information or advice will be much appreciated.

Regards

Dave

comp.lang.c
comp.lang.c++


ross

 

[John Henderson]

"Davo" wrote:

I am looking for active newsgroups, productive user friendly
tutorials, good weblinks, and local private tutors (Melbourne
Australia) in the programming language C. The two news groups
athome.aus.programming and athome.aus.programming.c++ dont
seem to have much activity. Any information or advice will be
much appreciated.

http://www.programmersheaven.com/

John