PRC as a amplifier in GPS question.

On 2006-04-10, Mr.T <MrT@home> wrote:
"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:4439bd5d$0$87584$c30e37c6@ken-reader.news.telstra.net...
**Wrong. ALL AC is subject to skin effect.

True, but pretty hard to measure at audio frequencies though!
Click to expand...
I wonder why they use stranded wire for loudspeakkers then...

--

Bye.
Jasen
 
"Jasen Betts" <jasen@free.net.nz> wrote in message
news:3332.443b69f4.e40d4@clunker.homenet...
I wonder why they use stranded wire for loudspeakkers then...
Click to expand...
To make it flexible.

MrT.
 
"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:443a33a1$0$87574$c30e37c6@ken-reader.news.telstra.net...
Just how much signal loss do you usually measure at 20kHz due to skin
effect Trevor?

**That would depend on the constrution of the wire and the impedance of
the
load.
Click to expand...
Why not give us some typical examples then! Not hand selected exceptions.
Or in your case, NOTHING at all.

That, again, is not what you stated. You stated:

"True, but pretty hard to measure at audio frequencies though!"

I suggest you study up on electrical theory.
Click to expand...
I suggest you pull your head in or give us some REAL figures to prove what a
pedantic prick you are being.

Sadly, the equations surrounding skin effect are not trivial ones.
Measuring skin effect,
however, is pretty straightforward.
Click to expand...
Yep, sure is if you have the right equipment, and the results at 20kHz are
pretty trivial.

Trivial would apply there as well!

**Not necessarily. Unless you know all the factors, you can't say.
Click to expand...
We do know typical figures for Hi-Fi equipment. Obviously you want to prove
you are right by using outrageous examples.

True, and I admitted that, but if you weren't being simply pedantic, you
would have clarified what you actually meant for the benefit of others.

**I don't need. I am merely stating fact.
Click to expand...
And adding NOTHING usefull at all, simply grandstanding it would seem.
I hope you are feeling suitably smug.

MrT.
 
"Jasen Betts" <jasen@free.net.nz> wrote in message
news:3332.443b69f4.e40d4@clunker.homenet...
**Wrong. ALL AC is subject to skin effect.

True, but pretty hard to measure at audio frequencies though!

I wonder why they use stranded wire for loudspeakkers then...
Click to expand...
Why don't you use hollow core tubes or waveguides?

MrT.
 
If the calculations on this website can be trusted, the effective skin depth in copper
at 20kHz is 0.5mm. So with very large diameter cables (high powered systems) this
could easily influence HF response with low impedance loads.

http://www.microwaves101.com/encyclopedia/calsdepth.cfm

There is some conjecture about stranded cables. Apparently if the strands are
individually insulated (ie Litz wire) they are effective in avoiding skin-depth
problems but if they are making electrical contact the *bundle* acts similarly to a
single cable, with some differences.

-Andrew M


"Jasen Betts" <jasen@free.net.nz> wrote in message
news:3332.443b69f4.e40d4@clunker.homenet...
On 2006-04-10, Mr.T <MrT@home> wrote:

"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:4439bd5d$0$87584$c30e37c6@ken-reader.news.telstra.net...
**Wrong. ALL AC is subject to skin effect.

True, but pretty hard to measure at audio frequencies though!

I wonder why they use stranded wire for loudspeakkers then...

--

Bye.
Jasen
Click to expand...
 
"Andrew M
If the calculations on this website can be trusted, the effective skin
depth in copper at 20kHz is 0.5mm. So with very large diameter cables
(high powered systems) this could easily influence HF response with low
impedance loads.

http://www.microwaves101.com/encyclopedia/calsdepth.cfm
Click to expand...

** Nope.

Simple, linear inductance has a *much* greater effect on cable impedance
than copper resistance at high audio frequencies.

A 1 inch long copper wire of 1 sq mm cross section has as much inductive
reactance as resistance at 3kHz.




........ Phil
 
On 2006-04-11, Phil Allison <philallison@tpg.com.au> wrote:
"Andrew M

If the calculations on this website can be trusted, the effective skin
depth in copper at 20kHz is 0.5mm. So with very large diameter cables
(high powered systems) this could easily influence HF response with low
impedance loads.

http://www.microwaves101.com/encyclopedia/calsdepth.cfm


** Nope.

Simple, linear inductance has a *much* greater effect on cable impedance
than copper resistance at high audio frequencies.

A 1 inch long copper wire of 1 sq mm cross section has as much inductive
reactance as resistance at 3kHz.
Click to expand...
I guess that's why they use paired conductors...

-

Bye.
Jasen
 
"Jasen Betts"
Phil Allison
"Andrew M

If the calculations on this website can be trusted, the effective skin
depth in copper at 20kHz is 0.5mm. So with very large diameter cables
(high powered systems) this could easily influence HF response with low
impedance loads.

http://www.microwaves101.com/encyclopedia/calsdepth.cfm


** Nope.

Simple, linear inductance has a *much* greater effect on cable impedance
than copper resistance at high audio frequencies.

A 1 inch long copper wire of 1 sq mm cross section has as much inductive
reactance as resistance at 3kHz.

I guess that's why they use paired conductors...
Click to expand...

** Only works when constructed as a transmission line and terminated with
the load equal to the characteristic impedance.

A twin or twisted pair cable does not match a 4 or 8 ohm speaker load not is
a speaker a defined impedance.



......... Phil
 
Thanks...
It dose produce regluated output however could be set not to by
removing the voltage regulator.
It is a car alternator,and requires about 920rpm to kick in as a guess
as for power vairation above this speed I have not got there yet,just
at finding out if I can do this cost vs. commercial so to speak.
I like this idea to get started....upgrade to more volts(better
trubine/alternator) down the track.
 
Yes....like this idea,however for first time setup it is alittle bit of
an overhead due to some unkown factors such as turbine speed,I may be
lucky to get 920 odd rpm out of it to power my car alternator however
will try,I have seen people claim upto 3kva from 30rpm on homemade
models using custom magnets and windings/parts.
 
Yeah........It is about $4k-$5k to get the commercial stuff,also
already pay one bill and with a roaring water course,it is worth a good
hard try,also have the option to pipe water for a possible 10foot
fall,however gallons per minute would be limited to about 4 gpm.
I will attempt to use water current to power an under running water
wheel for a first time attempt.
 
what does BTW mean

"David L. Jones" <altzone@gmail.com> wrote in message
news:1143445664.846047.105810@j33g2000cwa.googlegroups.com...
I just got the new 2006 Jaycar catalog (which is very good BTW, lots of
new stuff), and it's interesting to see them (on p9) respond to the
criticism about them turning to selling "gadgets" instead of
electronics parts.
As most of us have already figured out, they admittedly "have to have
the other stuff to pay the rent", but they are increasing their
electronics parts range to compensate.

Perhaps those who have bagged them in recent times will now understand.

I personally didn't think they had anything to answer for, as I have
only seen the electronics parts range increase and get better every
year. If they have to sell gadgets to consumers to compensate then so
be it.

Thumbs up from me.

Dave :)
Click to expand...
 
"crazy frog" <dingding@bumbadabum.com> wrote in message
news:443f64c0$0$10676$afc38c87@news.optusnet.com.au...
what does BTW mean

"By the way"
Click to expand...

Ken
 
thanks

is there a place where i can get these codes
from

"David L. Jones" <altzone@gmail.com> wrote in message
news:1143445664.846047.105810@j33g2000cwa.googlegroups.com...
I just got the new 2006 Jaycar catalog (which is very good BTW, lots of
new stuff), and it's interesting to see them (on p9) respond to the
criticism about them turning to selling "gadgets" instead of
electronics parts.
As most of us have already figured out, they admittedly "have to have
the other stuff to pay the rent", but they are increasing their
electronics parts range to compensate.

Perhaps those who have bagged them in recent times will now understand.

I personally didn't think they had anything to answer for, as I have
only seen the electronics parts range increase and get better every
year. If they have to sell gadgets to consumers to compensate then so
be it.

Thumbs up from me.

Dave :)
Click to expand...
 
has anyone tryed the suppliers farnell or r/s components
and wes components.

i dont shop much at dse anymore its a toyshop.
tandy electroics, i dont go there much eather.
jaycar and altronics are good i shop there lots.


"David L. Jones" <altzone@gmail.com> wrote in message
news:1143445664.846047.105810@j33g2000cwa.googlegroups.com...
I just got the new 2006 Jaycar catalog (which is very good BTW, lots of
new stuff), and it's interesting to see them (on p9) respond to the
criticism about them turning to selling "gadgets" instead of
electronics parts.
As most of us have already figured out, they admittedly "have to have
the other stuff to pay the rent", but they are increasing their
electronics parts range to compensate.

Perhaps those who have bagged them in recent times will now understand.

I personally didn't think they had anything to answer for, as I have
only seen the electronics parts range increase and get better every
year. If they have to sell gadgets to consumers to compensate then so
be it.

Thumbs up from me.

Dave :)
Click to expand...
 
hi all,
i eventually got a reply from uniden and they said to unplug the
power and the batteries out of the phone leave it for a couple of mins i
tried this several times and it seems to make no difference all well just
have to put up with it i suppose, thanks to all who helped

Matt


"Clifford Heath" <no.spam@please.net> wrote in message
news:443362ff$0$7605$afc38c87@news.optusnet.com.au...
Matt H wrote:
hi we recently bought the uniden WDECT 2355+2 cordless telephone which
operates on the 2.4ghz

2.4GHz also interferes with wireless PC networks.
Take it back and buy a 1.8GHz one. If you can't find a
Uniden one, try a Panasonic, I'm very happy with ours.
There's also 5.6, but they're more line-of-sight and $more.
Handsets that do speaker-phone adds a lot to the price, but
IMO is worth it, especially if you phone-bank etc, 'cos you
can see the keys you're pressing while you listen.
Click to expand...
 
Sorry, I make a mistake about the heat, we just mean the heat can be
scatter quick and smooth. Actually this product is very competitive.
 
how did you go with the turntable
and youre amp.

"David L. Jones" <altzone@gmail.com> wrote in message
news:1143445664.846047.105810@j33g2000cwa.googlegroups.com...
I just got the new 2006 Jaycar catalog (which is very good BTW, lots of
new stuff), and it's interesting to see them (on p9) respond to the
criticism about them turning to selling "gadgets" instead of
electronics parts.
As most of us have already figured out, they admittedly "have to have
the other stuff to pay the rent", but they are increasing their
electronics parts range to compensate.

Perhaps those who have bagged them in recent times will now understand.

I personally didn't think they had anything to answer for, as I have
only seen the electronics parts range increase and get better every
year. If they have to sell gadgets to consumers to compensate then so
be it.

Thumbs up from me.

Dave :)
Click to expand...
 
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