PRC as a amplifier in GPS question.

[ray]

Sir Jean-Paul Turcaud wrote:

Mates,

Water <snip> Okay !
With kind but sorry regards

Sir Jean-Paul Turcaud

Founder of the True Geology



20 Avenue des Grandes Guiardes

17000 La Rochelle France



Exploration Geologist & Offshore Consultant

Mobile +33 650 171 464



email address:- mining_pioneer@yahoo.com



~~ Ignorance Is The Cosmic Sin, The One Never Forgiven ~~

Well, it didn't take Le Turd long to resume operations, did it? Someone
want to give this turkey a lobotomy or has he already had one? The
earthquake that never was well and truly blew whatever cred you might
have had except with that twit Carole. So what's the next disaster?
C'mon, give us another one to laugh at when it doesn't happen.

 

[Kralizec Craig]

Franc Zabkar <fzabkar@iinternode.on.net> writes:

On Mon, 06 Mar 2006 05:45:00 GMT, "Tom Smyth"
TomS_13@a11.aone.net.au> put finger to keyboard and composed:

History repeating itself.... Looks like Jaycar is following the path of
Tandy (and later Dick Smith, after they successfully filled the void for a
while) with their prices slowly increasing and them selling increasing
amounts of novelties and toys. What is going to fill the void for
enthusiasts and professionals next?

What can a hobbyist build that China can't supply ready made for half
the price? Not much, I'd say.

No but it depends what the market wants. Electronics enthusiasts like the
build things themselves because that's how we learn the skills that can in
some cases be put to good use in other pursuits.

And then there is the feeling you get from building something yourself that
works better and more reliably than what you might be able to get from Ching
Chong country.

As for careers in electronics, I think ultimately all design will be
done offshore. So what will there be left for "professionals" to do,
except to emigrate?

I don't believe that will happen because then you would not be able to get
things designed properly to suit the local market, the local consumer
environment, or to suit the conditions that exist in other aspects of our
society.

China has the advantage (for now) of dirt-cheap labour and a huge
population. But what will be the effect of that? With such as massive
population, wage and inflation pressure will become extreme and over time
(say 10 to 20 years), getting things made in China will become increasingly
expensive and eventually so expensive that local design and production will
be attractive and affordable again.

Craig.
--
SUN RIPENED KERNELS - Surplus Sun Microsystems Equipment, Parts + Accessories
Waterfall, NSW, Australia - Operated by Craig Dewick - Founded in 1996
Main site: www.sunrk.com.au - Ebay Shop: www.ebayshops.com.au/sunripenedkernels
Ph: 02-9520-2547 (int. +612) - Fax: gone - Mobile: 04-2163-0547 (int. +614)

 

[David L. Jones]

Kralizec Craig wrote:

"Poxy" <pox@poxymail.com> writes:

Tom Smyth wrote:
History repeating itself.... Looks like Jaycar is following the path
of Tandy (and later Dick Smith, after they successfully filled the
void for a while) with their prices slowly increasing and them
selling increasing amounts of novelties and toys. What is going to
fill the void for enthusiasts and professionals next?

Their latest catologue is half devoted to gimmicks and novelties.
That junk obviously sells, or they wouldn't be selling it, but I've
gotta wonder who the hell buys it?

I remember an episode of The Office pointing out how awful those talking
dolls are, and a few months later Jaycar starts stocking the exact same
crap - I hate both them and the mouth-breathing morons who find them
amusing, but if it keeps the shop in business then I guess I have to live
with it.

Well I certainly do not like the line Gary Johnston and the team at Jaycar
are taking, but perhaps they're doing this because they want to compete with
DSE (aka Woolworths) who have got the edge over the other players because
Woolworths can leverage immense marketting power and have a supermarket in
almost every part of Australia so you can bet that plans are afoot for
Woolworths to start selling electronics products under the DSE banner
through supermarkets in the coming years.

Jaycar aren't trying to compete directly with DSE, they are just
stocking more stuff that the general public can buy. Nothing wrong with
that really if it keeps them in business.

It would be really nice to have places that are like Radio Despatch,
Sheridans, Geoff Wood, etc. which were all highly regarded by professionals
and enthusiasts alike. We do have Oatley Electronics thanks to the efforts
of Branko Justic, but they're more like Sheridans used to be than the Geoff
Wood (which was a very specialised supplier) or Radio Despatch.

There is RS and Farnell which carry virtually everything in stock you
could ever need.
They cater for the professional market (always have), and many of their
prices are not out of the range of the hobbyist. In fact I have often
bought things at Farnell cheaper than Jaycar or Altronics.
Yes, Oatley seem to be about the only "surplus" place left now.

Everyone seems to forget Altronics, they are still around and have a
good range for the hobbyist.

What about Futurlec - www.futurlec.com.au? I haven't tried them yet, but
their prices and range seem good.

Seem pretty good so far.

Jaycar's only sensible decision to date has been to move their Gore Hill
Store back to it's original location.

By that you are implying they have made bad decisions? Like what?
Sure they are selling lots of gadgets, but the range of electronics is
now bigger than I ever remember it being as a kid.

I'm sure Jim Rowe and others remember the Hurstville Jaycar store down the
northern part of Hurstville's CBD on Forest Road. That's where I was most of
the time but I spent time in school holidays, etc. working in York St, etc.
Jim was a regular customer and I bet if that store was still there today (it
got replaced by the one at Bankstown on the Hume Highway), Jim and many of
the regular faces from the area would still go there to buy things.

That's about 0.01% of their client base, so I doubt Jaycar care about
that :->

Dave

 

[Mick]

"ray" <ferret57@optusnet.com.au> wrote in message
news:44349601$0$20113$afc38c87@news.optusnet.com.au...

Sir Jean-Paul Turcaud wrote:
Mates,

Water <snip> Okay !
With kind but sorry regards

Sir Jean-Paul Turcaud

Founder of the True Geology



20 Avenue des Grandes Guiardes

17000 La Rochelle France



Exploration Geologist & Offshore Consultant

Mobile +33 650 171 464



email address:- mining_pioneer@yahoo.com



~~ Ignorance Is The Cosmic Sin, The One Never Forgiven ~~








Well, it didn't take Le Turd long to resume operations, did it? Someone
want to give this turkey a lobotomy or has he already had one? The
earthquake that never was well and truly blew whatever cred you might
have had except with that twit Carole. So what's the next disaster?
C'mon, give us another one to laugh at when it doesn't happen.

I'm still waiting for the giant tsunami to hit the east coast of Aus.
He's been predicting it every month for years and nothing's happened yet.
As for the water problem I suggest he look at the floods happening up in Katherine in
the Northern territory at the moment. Certainly no drought up there. LOL

 

[Johnny]

On Tue, 4 Apr 2006 21:57:23 +1000, "sommes" <jlj@kl.com> wrote:

yup...the gain is can't be adjusted.

i may add another precision amplifer to increase the gain.

Yes. The noise and DC offset errors are determined by the first stage
of the amplifier chain, so any secondry gain stage is much less
critical than the input stage. Is that what you wanted to know?

regards,
Johnny.

 

[John Mackesy]

Ross Herbert wrote:

On Mon, 03 Apr 2006 10:05:23 +1000, John Mackesy <mack@melbpc.org.au
wrote:

I recently 'fell heir' to a Birko soldering iron (80W), Birko Cat. no
'D1'. Anyone got any idea how old it is? Following replacement of the
cord and a bit of a cleanup it works really well.

I queried Birko, but they say 'all records have been lost'.

John Mackesy

If it has a bakelite handle it will probably date from 1950 - 60's. I
still have minee in working condition. Just gets difficult to find
1/2" copper rod (cheap) for making bits.

Well, it has a wooden handle. Does that make it pre-50s?

John Mackesy

 

[GB]

Rod Out Back <someone@IHATESPAM.BIGPOND.COM> wrote in
news:buj932h2s5h1o21tgb6pbu88emt3ve2069@4ax.com:

I think it's an endless circle, myself...

That's a self fulfilling prophecy right there. Whilst twits
like you respond to the guy and give him encouragement by
acknowledging his presence, he keeps responding. You have
only yourself to blame.

GB
--
"Men will never be free until the last king is strangled with the
entrails of the last priest." (Diderot, paraphrasing Meslier)

 

[Ross Herbert]

On Thu, 06 Apr 2006 19:38:20 +1000, John Mackesy <mack@melbpc.org.au>
wrote:

Ross Herbert wrote:
On Mon, 03 Apr 2006 10:05:23 +1000, John Mackesy <mack@melbpc.org.au
wrote:

I recently 'fell heir' to a Birko soldering iron (80W), Birko Cat. no
'D1'. Anyone got any idea how old it is? Following replacement of the
cord and a bit of a cleanup it works really well.

I queried Birko, but they say 'all records have been lost'.

John Mackesy

If it has a bakelite handle it will probably date from 1950 - 60's. I
still have minee in working condition. Just gets difficult to find
1/2" copper rod (cheap) for making bits.

Well, it has a wooden handle. Does that make it pre-50s?

John Mackesy

I don't know exactly when they changed from wood to bakelite but I got
mine in 1958 so it could have been mid 1950's when they changed.

One here on Ebay to see as example (watch out for url wrap)
http://cgi.ebay.com.au/vintage-BIRKO-electric-soldering-iron_W0QQitemZ6268428341QQcategoryZ39728QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[gcd]

Hi,
the HT12E and D are not really made for this form of data transmission
however try the following, try using synchronous data by using the /TE
input. This should restart the transmit data process to use the new data of
the D8-D11 pins.


ie

TE _____/-----\_____/-----\_____/-----\_____/-----\_____

D8 _______/-----\_______________/-----\___________
to
D11

D8 input = D8 output = 101

Data is valid on the the falling edge of /TE

Alternatively, only clock the /TE input when data on the inputs changes
rather than use a continuous clock.

Hope that helps
Greg



"petitGarco" <send_to_lok@hotmail.com> wrote in message
news:44376370$0$20637$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

Dear All,

I am building up a radio transmission link with 4 bits digital input
signal(around 50-100Hz). I have got two RF modules which are 315Mhz radio
transmitter and recevicer in 8kbps data rate. Also HT12E(encoder) and
HT12D
(decoder) have been used as well.

The circuit is working by inputting a 5V/0V (connect to 5V with switches)
and outputting with LEDs. However, when I connected the input to the
signal
generator (input 10-100Hz square wave signal with 4.5V amplitude) and
dectected the ouput with CRO, it doesn't work. Nothing can be outputted by
the CRO. The connection is shown as the attachment. I am trying to send
one
bit as testing.

Please kindly help me to solve the problem. Do I connect it in a wrong way
or is there any problem in the design? Thanks for your help.

Regards,
Lok

 

[petitGarco]

Sorry, photo can not be uploaded.

 

[Jasen Betts]

On 2006-04-09, gcd <gcd.deletemelbnospam@melbnospam.iimetro.com.au> wrote:

Hi,
the HT12E and D are not really made for this form of data transmission
however try the following, try using synchronous data by using the /TE
input. This should restart the transmit data process to use the new data of
the D8-D11 pins.


ie

TE _____/-----\_____/-----\_____/-----\_____/-----\_____

D8 _______/-----\_______________/-----\___________
to
D11

either you've got a sync problem or are using the wrong font.
I see the second pulse on D8 exactly synchronised with TE.
use courier, console, ocr-b, or some other monospaced font for these
diagrams.


--

Bye.
Jasen

 

[two bob]

If your hotrod works, who cares how old it is


"Ross Herbert" <rherber1@bigpond.net.au> wrote in message
newsg5c321pv2qgao534mt9mlinckigsdc2td@4ax.com...

On Thu, 06 Apr 2006 19:38:20 +1000, John Mackesy <mack@melbpc.org.au
wrote:

Ross Herbert wrote:
On Mon, 03 Apr 2006 10:05:23 +1000, John Mackesy <mack@melbpc.org.au
wrote:

I recently 'fell heir' to a Birko soldering iron (80W), Birko Cat. no
'D1'. Anyone got any idea how old it is? Following replacement of the
cord and a bit of a cleanup it works really well.

I queried Birko, but they say 'all records have been lost'.

John Mackesy

If it has a bakelite handle it will probably date from 1950 - 60's. I
still have minee in working condition. Just gets difficult to find
1/2" copper rod (cheap) for making bits.

Well, it has a wooden handle. Does that make it pre-50s?

John Mackesy


I don't know exactly when they changed from wood to bakelite but I got
mine in 1958 so it could have been mid 1950's when they changed.

One here on Ebay to see as example (watch out for url wrap)
http://cgi.ebay.com.au/vintage-BIRKO-electric-soldering-iron_W0QQitemZ6268428341QQcategoryZ39728QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[petitGarco]

Thx

"Jasen Betts" <jasen@free.net.nz> wrote in message
news:68f2.44389b63.24572@clunker.homenet...

On 2006-04-09, gcd <gcd.deletemelbnospam@melbnospam.iimetro.com.au> wrote:
Hi,
the HT12E and D are not really made for this form of data transmission
however try the following, try using synchronous data by using the /TE
input. This should restart the transmit data process to use the new data
of
the D8-D11 pins.


ie

TE _____/-----\_____/-----\_____/-----\_____/-----\_____

D8 _______/-----\_______________/-----\___________
to
D11

either you've got a sync problem or are using the wrong font.
I see the second pulse on D8 exactly synchronised with TE.
use courier, console, ocr-b, or some other monospaced font for these
diagrams.


--

Bye.
Jasen

 

[Trevor Wilson]

"Mr.T" <MrT@home> wrote in message
news:4424c73d$0$7532$afc38c87@news.optusnet.com.au...

"Jasen Betts" <jasen@free.net.nz> wrote in message
news:efd.44245c06.6f8c7@clunker.homenet...
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.

High frequency AC only.

**Wrong. ALL AC is subject to skin effect.


--
Trevor Wilson
www.rageaudio.com.au

 

[Ralph]

I also bought one of these units. It worked for 13 months and then got more
and more pixelation and freezing.
I turned it of for a day and then it would not even display the menu.
Thanks to you Phil, I replaced the capacitors you mentioned and it is now
back in action.
I now need to find a small quiet fan to install as you have suggested.
Thank you for your posting.

"Phil Allison" <philallison@tpg.com.au> wrote in message
news:49gsujFogg6uU1@individual.net...

Hi to my pals here,

In October 2005 I bought myself a DSE G7659 STB.

It worked like a charm for 17 months or so. Then, it began to misbehave
just as the Commonwealth Games was being broadcast from Melbourne -
first just a few pixellations, cracking noises and the odd audio muting.
This soon became much worse and affected all digital channels.

It *had* to be the STB and it was exhibiting the same symptoms reported by
others on usenet.

Once on the bench and open, I probed the various rails coming from the
PS - a separate module on its own PCB.

The 5 volt rail showed a bit more HF noise than I expected but all
voltages were OK. I left it powered off overnight ( no AC supply) and the
next day the symptoms were drastic, ie no pic at all !

This time the 5 volt rail measured only 3.4 volts with even more HF noise
than before - I reckoned that would stop the processor in its tracks all
right.

With the aid of my trusty Bob Parker ESR meter, it was soon clear that
both the 1000uF, 10 volt electros ( Asiacon brand) on the 5 volt rail
had gone high ESR - to about 1.5 ohms each !

New ones tested only 12 milliohms and were soon installed and that fixed
the 5 volt rail very nicely and returned the unit to full operation.

The PROBLEM with the G7659 SMPS is that all the electros are tucked under
an L shaped heatsink that runs hot - circa 75 C even with the box in free
air.

The easiest, permanent fix is to install a 40 mm, 12 volt, 0.6 watt fan
blowing onto the heatsink. The wiring loom from the SMPS to the main PCB
can be easily broken into to access the +12 volt rail and 0 volts.

The full 12 volts not necessary fro the fan and as little as 8.5 volts
does the trick as far as cooling the heatsink is concerned. This involves
fitting a series resistor of about 100 ohms and an electro across the fan
of 220uF - without the electro the fan may not start on power up.





....... Phil

 

[Phil Allison]

"Ralph"

I also bought one of these units. It worked for 13 months and then got more
and more pixelation and freezing.
I turned it of for a day and then it would not even display the menu.
Thanks to you Phil, I replaced the capacitors you mentioned and it is now
back in action.
I now need to find a small quiet fan to install as you have suggested.
Thank you for your posting.

** I used a "Sunon" KD1204 PFS2 -8

Rated at DC12 V - 0.6 W

From David Reid Electroncics in York St.

Came with a heatsink plate for cooling a CPU which I discarded.




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

 

[Mr.T]

"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!
Do YOU really worry about it Trevor?

MrT.

 

[Trevor Wilson]

"Mr.T" <MrT@home> wrote in message
news:443a05ba$0$20114$afc38c87@news.optusnet.com.au...

"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!

**Nope. A trivial exercise to measure at 20kHz. More difficult as the
frequency gets lower.

Do YOU really worry about it Trevor?

**Of course not. That, however, is not what you stated.


--
Trevor Wilson
www.rageaudio.com.au

 

[Mr.T]

"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:443a0c7d$0$87583$c30e37c6@ken-reader.news.telstra.net...

**Wrong. ALL AC is subject to skin effect.

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

**Nope. A trivial exercise to measure at 20kHz. More difficult as the
frequency gets lower.

Just how much signal loss do you usually measure at 20kHz due to skin effect
Trevor?
Trivial would apply there as well!

Do YOU really worry about it Trevor?

**Of course not. That, however, is not what you stated.

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.

MrT.

 

[Trevor Wilson]

"Mr.T" <MrT@home> wrote in message
news:443a127b$0$10674$afc38c87@news.optusnet.com.au...

"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:443a0c7d$0$87583$c30e37c6@ken-reader.news.telstra.net...
**Wrong. ALL AC is subject to skin effect.

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

**Nope. A trivial exercise to measure at 20kHz. More difficult as the
frequency gets lower.

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. 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. Sadly, the equations
surrounding skin effect are not trivial ones. Measuring skin effect,
however, is pretty straightforward.

Trivial would apply there as well!

**Not necessarily. Unless you know all the factors, you can't say.

Do YOU really worry about it Trevor?

**Of course not. That, however, is not what you stated.

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. Anyone who cares to dispute what I
say, need only refer to the appropriate text, to see that I am correct. I'll
say it again: Skin effect takes place on ALL AC signals. Whether it is
significant or not, depends on a variety of factors. At 50Hz skin effect can
be a significant loss factor. That does bother electricity supply companies.


--
Trevor Wilson
www.rageaudio.com.au