PRC as a amplifier in GPS question.

[Phil Allison]

"bruce varley"

Hi, This must be a common question, but I can't find anything relating to
it in back postings on my machine. What's the effect of parallelling two
stereo outputs to produce one mono one, without any interposing
resistance?
Can you actually break something by doing it with ordinary hifi-standard
gear? Is there any devastating effect on quality, I guess I'll hear it if
there is. TIA

** The outcome of linking L & R audio line outputs is not predictable, since
a wide variety of audio line output circuits arrangements exist in common
use.

It may work out OK .

OR

You will experience loss of level AND bass frequencies

You will experience peak clipping on loud passages.

You will experience clipping all the time.


NB:

If the signal is in exact mono - it will work fine !




......... Phil

 

[crazy frog]

had this prob with a NEC tv a small eletro cap
in the power supply.
its also pos that a cap maybe the fault, look
around any hot spots were these caps are, hot
spots will dry them out.

"NoHope" <nospam@none.no> wrote in message
news:4421e4a5_1@news.iprimus.com.au...

I'm hoping someone could help me with some info for a Proline 7G1r
monitor.
Seems to be no go - fuse checks out OK and power seems to be getting into
the power supply OK (main filter cap charges fine), and there seems to be
a
very soft "tic-tic-tic" coming from relay RY901 (or nearby). monitor was
working fine then just stopped powering up.

Would anyone have a circuit diagram they could email me, and maybe some
hints what may be the problem? I don't usually work on TV's and monitors
but
I do have electronics training and experience so any helpful hints would
be
greatly appreciated. You can email me direct to nathjohn2000 AT
yahoo.com.au

Thanks

Nathan

 

[The Real Andy]

On 22 Mar 2006 14:43:52 -0800, "David L. Jones" <altzone@gmail.com>
wrote:

Front page news in Electronics News this month:
Panasonics TV factory at Penrith west of Sydney has closed due to the
boom in the LCD/Plasma market.

The Penrith plant manufactured all of Panasonics medium to large screen
CRTs for the Asia-Pacific market. They used to churn out a finished and
boxed TV even 49 seconds or so, impressive stuff.

A sad loss for the Australian industry.

Dave

I thought palsonic assembled in australia too, or is that the same
factory?

 

[David L. Jones]

Magic Mushroom Farmer wrote:

Hey I need to conduct 12VDC @ 130 AMP over 300-400m with minimal loss
and expense.(we all need to do this right?)
I have discovered that I may need some seriously heavy duty cable for
my power station.

If you try and do it at 12V then yes.

Basics are understood that DC was no good for long runs therefore AC is
used.
7 to 12 miles for DC dose not ring bells!?

Quite common.
I've done a 500VDC distributed power system over 12km, it can be a very
efficient way to do it actually.

Questions:
Is It dumb to try to transport DC over such a distance?

No. DC is common for long cable runs such as this.
Trans-continental cable runs that link power grids are DC.

What loss can I expect provided I can find a matching cable specific to
my requirments.?roughly(have been googling,but looking for been there
opinions)

What Cable has been used in the past for this type of
application......at a guess would it be right to assume,phone
cable?telegraph?amps rating? Old hydro cable?That copper cable they
used to run by the train tracks 20 years back?

You'll probably need the train tracks themselves!
Long cable runs like this are almost always done at a much higher
voltage to reduce losses.

Do I need to go 24VDC to get back to 12VDC at destination?(hate this
idea)

You will have to use a higher voltage for the long cable run and then
convert it back, you don't have much choice really.
The higher the voltage the less copper you need.
130A is a heck of a lot though, you might need multiple DC-DC
converters at each end.

Dave

 

[Magic Mushroom Farmer]

I recall we took a truck load of copper, 1 ton of it for scrap 20
years ago and got $150 for it,must have trippled by now,as people go
crazy flogging the copper leads off junk yard stuff.
50 tons is alot of money....lol.

I have some 7 strand IMAPI 10-20mm ,unsure what it was used
for....hydro earths?just looked at the power pole and they use even
bigger unsheilded stuff for their earths.
It is sheilded conductor wire...possibly that stuff they run to your
house from the transformer......cannot find specs on it.
I need big battery cable......this is what I need to ask/look for.....I
got the picture....thanks
Think I might go and check out an era gone by power station, everything
is long gone expect turbines sitting in a deep water filled hole,never
know,they used to drop water on trubines which powered 3 giant
alternators via belt drives....strange...thats how they did it
though....I am doing the same thing....just small scale.
Thanks again Phill.

 

[Mr.T]

"The Real Andy" <will_get_back_to_you_on_This@> wrote in message
news:30m422df0ainjh764gdbvdd15r1s43r0l3@4ax.com...

I thought palsonic assembled in australia too, or is that the same
factory?

I thought "Palsonic" was just a rip off monika trying to fool people that
their "no name" Chinese made crap was actually made by Panasonic.
Do you have any information to the contrary?

MrT.

 

[Arthur Drummond]

"crazy frog" <dingding@bumbadabum.com> wrote in message
news:44224856$0$7531$afc38c87@news.optusnet.com.au...

what are we comming to

"David L. Jones" <altzone@gmail.com> wrote in message
news:1143067432.900434.110670@i39g2000cwa.googlegroups.com...
Front page news in Electronics News this month:
Panasonics TV factory at Penrith west of Sydney has closed due to the
boom in the LCD/Plasma market.

The Penrith plant manufactured all of Panasonics medium to large screen
CRTs for the Asia-Pacific market. They used to churn out a finished and
boxed TV even 49 seconds or so, impressive stuff.

A sad loss for the Australian industry.

Dave

A country of bad spellers and lousy grammar?

 

[Jasen Betts]

On 2006-03-23, Magic Mushroom Farmer <jjbruce@gmail.com> wrote:

Hey I need to conduct 12VDC @ 130 AMP over 300-400m with minimal loss
and expense.(we all need to do this right?)
I have discovered that I may need some seriously heavy duty cable for
my power station.

Basics are understood that DC was no good for long runs therefore AC is
used.

DC is used for the really long runs

7 to 12 miles for DC dose not ring bells!?

no, but for 1200 miles perhaps

Questions:
Is It dumb to try to transport DC over such a distance?

no. "12V" is your problem, not "DC"

If you can go to 24V you'll get the same wattage of loss with 1/4 of the
copper thickness, but you have to use 24V appliances or convert it back to 12V
(figure 80-90% efficiency converting each way)

if you can make 48V work it gets even better...

What loss can I expect provided I can find a matching cable specific to
my requirments.?roughly(have been googling,but looking for been there
opinions)

What Cable has been used in the past for this type of
application......at a guess would it be right to assume,phone
cable?telegraph?amps rating? Old hydro cable?That copper cable they
used to run by the train tracks 20 years back?

Do I need to go 24VDC to get back to 12VDC at destination?(hate this
idea)

ohm's law will help you answer that.

I can find 100amp cable in 100m rolls where do I look for bigger stuff
?

auto electrical suppliers, welding suppliers.
industrial electrical suppliers

Finally is it worth AC over this distance?I would gather a similar
infustructure would need to be in place as with DC?

I'll assume you mean going to 100V or more if it was 1 mile i'd say yes,
for a quarter mile I'm not sure.

it all depends on how much you want to spend and how much power you can
afford to loose in trasmission.

To tidy this up,what cable should I be looking at using?

that depends.

Bye.
Jasen

 

[The Real Andy]

On Fri, 24 Mar 2006 15:10:38 +1100, "Mr.T" <MrT@home> wrote:

"The Real Andy" <will_get_back_to_you_on_This@> wrote in message
news:30m422df0ainjh764gdbvdd15r1s43r0l3@4ax.com...

I thought palsonic assembled in australia too, or is that the same
factory?

I thought "Palsonic" was just a rip off monika trying to fool people that
their "no name" Chinese made crap was actually made by Panasonic.
Do you have any information to the contrary?

MrT.

I was close, kinda:

http://www.palsonic.com.au/about_us/about.htm

Seems Palsonic is an Aussie company, that looks like it rebadges gear
made by offshore manufacturers.

 

[The Real Andy]

On Fri, 24 Mar 2006 19:24:44 +1100, Terry Collins
<newsonespam-spam@woa.com.au> wrote:

Phil Allison wrote:
"Terry Collins"

Magic Mushroom Farmer wrote:


What Cable has been used in the past for this type of
application.....

Is it economical to just runs some standard 240V heavy gauge cable in
parrallel? I know you can pick up drums of 240V 20Amp cable at various
places cheaply. Perhaps running 5 runs of that may give you what you
want cheaper.




** Terry - I did the sums for you.

The OP needs 50,000 kilos of copper wire.

Is that in one wire, or multiple strands?
Or would he be better off installing copper pipe (skin effect where
electrons prefer outside of strand to inside)?

Get your calculator out and start with the fact that 1 metre of 1 sq mm
copper wire has 18 millohms resistance.

I probably won't get far considering my brain is clearly aware that this
is Friday afternoon/evening and it wants to relax {.


So 400 metres gives ( 400 x 0.018) = 7.2 Ohm in one wire
therefore total resistance in one pair (there and back) is 14.4 Ohm
And if V = IR where V = 24V and I = 160 Amps,
there fore wire resistance needed is 0.15 Ohm, which means he needs 96
wires to get 160 Amps doing a nice loop out and back but no useful work
at any point {.

Actually that whole 160Amps thing has my ming boggling. I'm wondering it
it isn't easier to move the generator?

Plus, 160Amps must be something like welding 2" thick steel, so he is
going to require some huge special switches, otherwise the poor sucker
who has to throw that switch is going to want full leather kits (boots
to top of head) and arc welding visor?

Did I miss the revelation as to what this is for?

I wonder what the application is. Perhaps a Genny or a briggs and
stratton strapped to a modern car alternator is cheaper.

 

[Allan]

What do you expect!
We all want a decent Pay each week,
We are not Little China men working in a country earning next to nothing.
We have govts with Free trade agreements saying its a good thing,
They also drop the Import duty's.
China do not have a floating currency, its like we used to be years ago, a
fixed Exchange rate.
So in reality they have a VERY cheap exchange rate.
So yeah, they and other Asian Countries will ALWAYS out perform us Caucasian
Wage earners....
So don't Gripe when our poor Australian Companies cannot compete against
these guys,
It just will never happen...
Personally, I think they should have High Tariffs on ALL imported Gear, and
anything Made Locally should be free of Tax and other duties. Thus putting
us on a better equal playing field. It snot Just electronics, it should be
across the board, Cars, Foods etc..

Allan

"David L. Jones" <altzone@gmail.com> wrote in message
news:1143067432.900434.110670@i39g2000cwa.googlegroups.com...

Front page news in Electronics News this month:
Panasonics TV factory at Penrith west of Sydney has closed due to the
boom in the LCD/Plasma market.

The Penrith plant manufactured all of Panasonics medium to large screen
CRTs for the Asia-Pacific market. They used to churn out a finished and
boxed TV even 49 seconds or so, impressive stuff.

A sad loss for the Australian industry.

Dave

 

[Phil Allison]

"bruce varley" = TROLL

Because you can buy neat adaptors from stereo 3.5 to Mono 6.5.

** For what ?

Hi-fi audio gear or fucking PC shit.

For paralleling inputs OR outputs?


Post a link you TROLLING asshole.





........ Phil

 

[Jasen Betts]

** Terry - I did the sums for you.

The OP needs 50,000 kilos of copper wire.

Is that in one wire, or multiple strands?
Or would he be better off installing copper pipe (skin effect where
electrons prefer outside of strand to inside)?

skin effect is for AC only.

Bye.
Jasen

 

[Jasen Betts]

On 2006-03-24, Allan <all@n.com> wrote:

What do you expect!
We all want a decent Pay each week,
We are not Little China men working in a country earning next to nothing.
We have govts with Free trade agreements saying its a good thing,
They also drop the Import duty's.
China do not have a floating currency, its like we used to be years ago, a
fixed Exchange rate.
So in reality they have a VERY cheap exchange rate.
So yeah, they and other Asian Countries will ALWAYS out perform us Caucasian
Wage earners....
So don't Gripe when our poor Australian Companies cannot compete against
these guys,
It just will never happen...
Personally, I think they should have High Tariffs on ALL imported Gear, and
anything Made Locally should be free of Tax and other duties. Thus putting
us on a better equal playing field. It snot Just electronics, it should be
across the board, Cars, Foods etc..

oil, software, medicine, books...

Bye.
Jasen

 

[David L. Jones]

Allan wrote:

What do you expect!

It was to be expected, but it is still sad news none the less.

We all want a decent Pay each week,
We are not Little China men working in a country earning next to nothing.
We have govts with Free trade agreements saying its a good thing,
They also drop the Import duty's.
China do not have a floating currency, its like we used to be years ago, a
fixed Exchange rate.
So in reality they have a VERY cheap exchange rate.
So yeah, they and other Asian Countries will ALWAYS out perform us Caucasian
Wage earners....

Funny how the Panasonic factory has been going so well for so long then
isn't it?
It only went belly up because the CRT market has declined drastically.

So don't Gripe when our poor Australian Companies cannot compete against
these guys,

I didn't, you're putting words into my mouth.
The factory closed because the CRT market is in decline, that was
expected. It has got nothing to do with them not being able to compete,
they have been doing that sucessfully for a very long time.

Personally, I think they should have High Tariffs on ALL imported Gear, and
anything Made Locally should be free of Tax and other duties. Thus putting
us on a better equal playing field. It snot Just electronics, it should be
across the board, Cars, Foods etc..

The world doesn't work that way, it's a tad more complicated.

Dave

 

[Mike]

In article <1228dh4qvq9kv59@corp.supernews.com>, lugnut808@nospam.yahoo.com says...

What do they do inside Braun shavers? My old one can take anything from
12VDC to 240VAC through the same plug which is a pretty wide range.

Interesting, I didnt know that, do they have a small relay to make
it cheap, cause any semi to handle that isnt reliable if its cheap,
unless its low down on the failure/repair curve etc...

How well can you rely on the duty cycle of the 500V being small? If you
knew very surely that it would be a small duty cycle then you could try
putting a L-C filter at the input of your circuit with a high value
inductor. If you follow that with a switched-mode converter then the whole
circuit could be quite efficient. Might not be cheap though.

Now thats a good idea, the last thing I thought of using there was an
inductor but it does make a lot of sense. The 500v pulse is only for roughly
10 microseconds so that makes it a pretty viable idea, thanks

Just out of interest, where do you come up with such weird requirements?

The last one is providing some visual aid to the hearing impaired where
a single row of switches runs an outside light and a couple of fans, they
dont hear the fans and they can't always notice the outside light, having
an inside flashing led on the switch cluster derived from an 'OR' was ideal
as a reminder that something on the cluster was left on...

This one is for a vehicle ignition system, be able to supply some power
to some logic but make it plug compatible so installer doesnt have to run
an extra cable for 12v power, get it via the coil return etc

Some background info would help e.g. supply impedance etc.

The 500v pulse is back emf from the coil, so I would guess fairly low
in that the primary impedance is low, I dont want to snub the pulse
if at all possible as it would then reduce the striking voltage to
overcome the spark gap on the sec. The LC seems pretty much the perfect
solution, the output of the LC would be seriously damped when the pulse
arrives as the rise time is fairly short on the 500v pulse and yet have
low impedance to get enough power inbetween pulses, prob wouldnt need an
SMPS as a resistor, clamping zener and cap would be plenty for the amount
of power I would like to supply which is only about 50 or so mA.

Nice one, I should have thought of that <guh>, where would I be without
this newsgroup or your input

Chris

Hey CHris, you didnt go to WAIT in WA some many moons ago did you ?

--
Regards
Mike
* GMC/VL Commodore, Calais VL Turbo FuseRail that wont warp or melt !
* Twin Tyres to suit most sedans, trikes and motorcycle sidecars
http://niche.iinet.net.au

 

[Chris Jones]

Mike wrote:

In article <1228dh4qvq9kv59@corp.supernews.com>,
lugnut808@nospam.yahoo.com says...

What do they do inside Braun shavers? My old one can take anything from
12VDC to 240VAC through the same plug which is a pretty wide range.

Interesting, I didnt know that, do they have a small relay to make
it cheap, cause any semi to handle that isnt reliable if its cheap,
unless its low down on the failure/repair curve etc...
No there is nothing mechanical in there except the shaving part. It charges

a single NiMH cell, but the SMPS can also just about run the motor by
itself when the battery is flat. I was impressed by the voltage range.

How well can you rely on the duty cycle of the 500V being small? If you
knew very surely that it would be a small duty cycle then you could try
putting a L-C filter at the input of your circuit with a high value
inductor. If you follow that with a switched-mode converter then the
whole
circuit could be quite efficient. Might not be cheap though.

Now thats a good idea, the last thing I thought of using there was an
inductor but it does make a lot of sense. The 500v pulse is only for
roughly 10 microseconds so that makes it a pretty viable idea, thanks

Just out of interest, where do you come up with such weird requirements?

The last one is providing some visual aid to the hearing impaired where
a single row of switches runs an outside light and a couple of fans, they
dont hear the fans and they can't always notice the outside light, having
an inside flashing led on the switch cluster derived from an 'OR' was
ideal as a reminder that something on the cluster was left on...

This one is for a vehicle ignition system, be able to supply some power
to some logic but make it plug compatible so installer doesnt have to run
an extra cable for 12v power, get it via the coil return etc

Some background info would help e.g. supply impedance etc.

The 500v pulse is back emf from the coil, so I would guess fairly low
in that the primary impedance is low, I dont want to snub the pulse
if at all possible as it would then reduce the striking voltage to
overcome the spark gap on the sec. The LC seems pretty much the perfect
solution, the output of the LC would be seriously damped when the pulse
arrives as the rise time is fairly short on the 500v pulse and yet have
low impedance to get enough power inbetween pulses, prob wouldnt need an
SMPS as a resistor, clamping zener and cap would be plenty for the amount
of power I would like to supply which is only about 50 or so mA.

Nice one, I should have thought of that <guh>, where would I be without
this newsgroup or your input
The thing I worry about is that you will need a high value of inductance

combined with the ability to pass a reasonable amount of current without
saturating the core, and also fairly low capacitance would help, I suspect,
since otherwise it will affect the ignition pulses. If you could get the
current consumption of your load down then that would make everything a lot
easier. I would consider using the primary of a small mains transformer as
an inductor, but the current would probably saturate it.

There might be an alternative solution with a high voltage MOSFET or TV line
output transistor somehow, but if it were me, I would be trying very hard
to run an extra wire to the normal battery voltage.

Chris

Hey CHris, you didnt go to WAIT in WA some many moons ago did you ?

No never been to WA. Different Chris I suppose.

Chris

 

[dmm]

On Fri, 24 Mar 2006 23:51:30 GMT, email@gooble.gooble (S Roby) wrote:

Hi ther
The local Kmart is selling 12v cordless drills for less than NZ$10 , about $7
in real money.
I was think of buying on just for the battery pack. Its less than the cost of
2 good (Eveready) AA rechargeable batts.

I know every drill will be different but generally....
Will the battery pack just be nasty old nicads, or something better??
What could I expect to see in the battery pack??. Just a bunch of AA batts
joined together or something else ??

Buy one and let everyone know.

 

[T.J.& L.K. Dunster]

Yes they were selling them in Tas. about six months ago, battery packs are
nicads, chargers are dumb, the drills are o.k. and will take standard 14
volt packs.
A mate of mine bought two for the motors, uses them for model yacht winches.
I bought one because it was only $10 and apart from having to recharge the
batteries fairly often, it is quite good ,useful to have lying around. Why
not buy four of them and just use them up.
Pius what more can you expect from a $10 drill. They were selling them for
twenty last month.


"S Roby" <email@gooble.gooble> wrote in message
news:ZB%Uf.8417$JZ1.311592@news.xtra.co.nz...

Hi ther
The local Kmart is selling 12v cordless drills for less than NZ$10 , about
$7
in real money.
I was think of buying on just for the battery pack. Its less than the cost
of
2 good (Eveready) AA rechargeable batts.

I know every drill will be different but generally....
Will the battery pack just be nasty old nicads, or something better??
What could I expect to see in the battery pack??. Just a bunch of AA batts
joined together or something else ??

 

[Jasen Betts]

On 2006-03-24, S Roby <email@gooble.gooble> wrote:

Hi ther
The local Kmart is selling 12v cordless drills for less than NZ$10 , about $7
in real money.
I was think of buying on just for the battery pack. Its less than the cost of
2 good (Eveready) AA rechargeable batts.

I know every drill will be different but generally....
Will the battery pack just be nasty old nicads, or something better??
What could I expect to see in the battery pack??. Just a bunch of AA batts
joined together or something else ??

could be sub-c size instead.
prolly extremely nasty old nicads

probably no-nipple cells with spot-welded interconnects,

Bye.
Jasen