PRC as a amplifier in GPS question.

[John Crighton]

On Wed, 16 Jul 2003 08:44:35 +1000, Mike Harding
<mike_harding1@hotmail.com> wrote:

And finally:

Mounted the 3 MOSFETs with the heaviest load on their own
0.37 deg C/W without any insulating pads and with two local
3" fans - ran them for 20 minutes+ with each mosfet passing
6A25 and dissipating 58W plus 3 power resistors (on the same
heatsink) each dissipating 18W (grand total of ~220W). The
MOSFET case temperatures went to around 110 deg C
which means the junction temps are within spec. for those
devices. Problem solved

Moral: Don't use insulating pads on heatsinks if you can
possibly avoid it.

Mike Harding

Hello Mike,

thanks for sharing that heat sinking problem and how
you solved it.
Years ago I worked at a place called Maitec
that made UPSs. They used strips of that sil-pad
material stuck onto the heatsink just like a stick on
label. Peel and press on. The strips they used were
just over an one inch wide by several inches long.

The FETs protruded out from the edge of the board
and were clamped down by springy steel clamps.
One clamp for two or three power FETs. One springy
finger per transistor.

The advantage of the clamp is that positioning the
device when soldered to the board just has to be neat
and not accurate.
No plastic insulating washer involved that can soften up.

I only mention this as a second best approach, in case
you have to do it again for a less strenuous application
and happen to come across some lengths of that sil-pad
stick-on strip at a good price.

I enjoyed reading your report. Thanks for that.

Regards,
John Crighton
Hornsby

 

[The real Andy]

"Bob Parker" <bobp@bluebottle.com> wrote in message
news:fg48hvs06rscpqokgpao6c4ns8c9gmrcis@4ax.com...

"The real Andy" <ihatehifitrolls@yahoo.com.au> wrote:

Looking for the little samsung camera, but also looking for good prices
on
other digital cameras, around the 3.2mega pixel variety.

I know that this is completely off-topic and I might get singed, but
I suggest that you take a look at the Dirt Cheap Cameras website at
http://www.dirtcheapcameras.com.au. I got my 3.2 megapixel Olympus
C-350 over $80 cheaper from them than the going price. Excellent
service too.
If you want to see some samples of the images from a C-350, look at
http://bob.parker.web1000.com/photos.htm. I hope this is helpful and
not too inflammatory to everyone else...

I like the canon EOS series, hmmm, the modern slr. shame about the price.

I'm really cahsing the samsung, mainly cause it takes its own specialised
rechargable or AA's and it comes with a neat car charger.

 

[John Crighton]

On Wed, 16 Jul 2003 17:25:17 +1000, "Phil Allison"
<philallison@optusnet.com.au> wrote:

** Ever meet an engineer there called Greg Hunter ( or maybe Greg Smith )
?????



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

Hello Phil,
my memory is fading a bit but I do remember an engineer
with a fairly bushy hairdo, maybe with a pig tail/pony tail.
I think his name was Greg. He used to joke around with
words, puns and peoples misuse of the English language.
A generally friendly type of guy, very well spoken. Does
that sound like the same fellow? Last names have
completely gone from my memory.
Regards,
John Crighton
Hornsby

 

[Phil Allison]

"John Crighton" <john_c@tpg.com.au> wrote in message
news:3f14ff04.6670249@News.CIS.DFN.DE...

On Wed, 16 Jul 2003 17:25:17 +1000, "Phil Allison"
philallison@optusnet.com.au> wrote:


** Ever meet an engineer there called Greg Hunter ( or maybe Greg
Smith )
?????



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


Hello Phil,

my memory is fading a bit but I do remember an engineer
with a fairly bushy hairdo, maybe with a pig tail/pony tail.
I think his name was Greg. He used to joke around with
words, puns and peoples misuse of the English language.
A generally friendly type of guy, very well spoken. Does
that sound like the same fellow? Last names have
completely gone from my memory.

** That does not sound like him.



.......... Phil

 

[Data888]

No, I don't want a F connector. I want the standard 75ohm connector to
plug into VCRs & TVs and stuff, but I can only find ones that screw onto
the cable. I want crimp ones.

Nick



Data888 wrote:

Hi.
Does anyone know where in Melbourne (preferably near the city) that
sells crimp type PAL TV line plugs & sockets like Foxtel installers use?
I have found a few mailorder places online, but I don't really want to
mailorder a few plugs...

Nick

 

[Data888]

I've found that Hills Antenna makes the plugs. Just gotta find somewhere
to buy them.

Nick



Data888 wrote:

Hi.
Does anyone know where in Melbourne (preferably near the city) that
sells crimp type PAL TV line plugs & sockets like Foxtel installers use?
I have found a few mailorder places online, but I don't really want to
mailorder a few plugs...

Nick

 

[Bob Parker]

"Rod Speed" <rod_speed@yahoo.com> wrote:

That cat is obviously an alien too.

Maybe, but at least it doesn't have flashing green eyes like that
mongrel yapping dog.

No need to grovel quite so obsequiously |-)

After the flaming Don McKenzie got for innocently trying to alert
people here to something useful and on-topic he was selling a few
months ago, I thought I should be at least a little bit obsequious.

Bob


Hate spam? Go to http://www.bluebottle.com (It's free)

 

[KLR]

On Wed, 16 Jul 2003 00:43:30 +1000, Bob Parker <bobp@bluebottle.com>
wrote:

"The real Andy" <ihatehifitrolls@yahoo.com.au> wrote:

Looking for the little samsung camera, but also looking for good prices on
other digital cameras, around the 3.2mega pixel variety.

I know that this is completely off-topic and I might get singed, but
I suggest that you take a look at the Dirt Cheap Cameras website at
http://www.dirtcheapcameras.com.au. I got my 3.2 megapixel Olympus
C-350 over $80 cheaper from them than the going price. Excellent
service too.
If you want to see some samples of the images from a C-350, look at
http://bob.parker.web1000.com/photos.htm. I hope this is helpful and
not too inflammatory to everyone else...


Bob


Hate spam? Go to http://www.bluebottle.com (It's free)

excellent pics
particularly the close up stuff like the watch and the eprom

cute cat too

 

[Rod Speed]

Bob Parker <bobp@bluebottle.com> wrote in message
news:mtrahv4cmqegq34q9d67a2mr3i4lv91mh2@4ax.com...

Rod Speed <rod_speed@yahoo.com> wrote

That cat is obviously an alien too.

Maybe, but at least it doesn't have flashing
green eyes like that mongrel yapping dog.

It does have one hell of a 'why dont you go and fuck yourself' glare tho |-)

Presumably thats what the dog is going ballistic about |-)

No need to grovel quite so obsequiously |-)

After the flaming Don McKenzie got for innocently trying to alert
people here to something useful and on-topic he was selling a few
months ago, I thought I should be at least a little bit obsequious.

You should have had a warning so we could reach for the spew bucket |-)

 

[KLR]

On Thu, 17 Jul 2003 07:01:01 +1000, "Rod Speed" <rod_speed@yahoo.com>
wrote:

Bob Parker <bobp@bluebottle.com> wrote in message
news:mtrahv4cmqegq34q9d67a2mr3i4lv91mh2@4ax.com...
Rod Speed <rod_speed@yahoo.com> wrote

That cat is obviously an alien too.

Maybe, but at least it doesn't have flashing
green eyes like that mongrel yapping dog.

It does have one hell of a 'why dont you go and fuck yourself' glare tho |-)

That just proves that she is a normal, healthy cat. And that at that

moment was NOT hungry too.

Presumably thats what the dog is going ballistic about |-)

No need to grovel quite so obsequiously |-)

After the flaming Don McKenzie got for innocently trying to alert
people here to something useful and on-topic he was selling a few
months ago, I thought I should be at least a little bit obsequious.

You should have had a warning so we could reach for the spew bucket |-)

 

[Steve]

Data888 <kcinSPAMBLOCK@bigfoot.com.au> wrote in message news:<3F155E0C.8030301@bigfoot.com.au>...

Does anyone know where in Melbourne (preferably near the city) that
sells crimp type PAL TV line plugs & sockets like Foxtel installers use?
I have found a few mailorder places online, but I don't really want to
mailorder a few plugs...

Ok, lets get to the bottom of this. Is it a BNC, like this?

(what ridiculous URLs!)

http://www1.jaycar.com.au/productView.asp?ID=PP0647&CATID=&keywords=BNC&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=

Or is it an f-connector or an "RF" connector, like these? (the f
connector is the one on the left with the screw thread connection);

http://www1.jaycar.com.au/productView.asp?ID=WV7384&CATID=36&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=477


You'll still need a crimping tool, and that is gonna set you back a
fair bit (maybe $60). Also, you'll have trouble stripping the cable
correctly unless you have one of these $25 doovies;

http://www1.jaycar.com.au/productView.asp?ID=TH1820&CATID=&keywords=coax+stripper&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=

My Foxtel installation has an f-connector cable from the dish to the
receiver (ie; aerial connection).

It then has a TV coax type connector (commonly called and RF plug)
connecting video and audio together into the tuner section of my VCR
(also a type of aerial or RF connection). I can tune my VCR into
Foxtel via this connection.

It also has RCA cables connecting the video and STEREO audio directly
to the line in of my VCR ("normal" video and audio signals). This
type of connection does not require that I tune the VCR.
The RCA that connects the VIDEO signal may on some devices be a BNC
instead.

nifty

 

[Rod Speed]

KLR <kreed@bigpond.net.au> wrote in message
news:iopbhvkmvtf407iocduk4fd9rlkmehi6gu@4ax.com...

Rod Speed <rod_speed@yahoo.com> wrote
Bob Parker <bobp@bluebottle.com> wrote
Rod Speed <rod_speed@yahoo.com> wrote

That cat is obviously an alien too.

Maybe, but at least it doesn't have flashing
green eyes like that mongrel yapping dog.

It does have one hell of a 'why dont you go and fuck yourself' glare tho |-)

That just proves that she is a normal, healthy cat.

None of the neighbours cats have anything like that glare.

And that at that moment was NOT hungry too.

That cat looks like it would just start ripping
strips off your leg if it was feeling a tad peckish.

To say nothing of what it would do to an anklebiter.

Presumably thats what the dog is going ballistic about |-)

No need to grovel quite so obsequiously |-)

After the flaming Don McKenzie got for innocently trying to alert
people here to something useful and on-topic he was selling a few
months ago, I thought I should be at least a little bit obsequious.

You should have had a warning so we could reach for the spew bucket |-)

 

[Jason James]

"John Mackesy" <mack@melbpc.org.au> wrote in message
news:bf3les$ksq$1@possum.melbpc.org.au...

Looks like a single-ended valve-type output transformer with multi-tapped
secondary - marked '2624.' I'd like to know what its characteristics are,
if
anyone has any old A & R data sheets around.

John Mackesy

Sorry, your chances are pretty slim. There were literally 100s of different
types, but basically primary Z of roughly 10k for tetrodes and 2.7 ohm secs
were a common value.
Multi tapped secs makes it a more recent trfer if it is an output tranny.
Class A outputs were really less common than B class (centre tapped primary)

Jason

 

[Phil Allison]

"John Mackesy" <mack@melbpc.org.au> wrote in message
news:bf3les$ksq$1@possum.melbpc.org.au...

Looks like a single-ended valve-type output transformer with multi-tapped
secondary - marked '2624.' I'd like to know what its characteristics are,
if
anyone has any old A & R data sheets around.

** You could always measure it.

Do a 400 Hz sine wave test to get the turns ratio to the full
secondary - square the result and multiply by 15 to get the primary Z.
The DC current handling *is* a bit more work.



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

 

[Data888]

Yup! They have them. Thanks for your help everyone.

Nick



Rob Judd wrote:

Try Radio Parts.

Data888 wrote:

Hi.
Does anyone know where in Melbourne (preferably near the city) that
sells crimp type PAL TV line plugs & sockets like Foxtel installers use?
I have found a few mailorder places online, but I don't really want to
mailorder a few plugs...

Nick

 

[The real Andy]

"Bob Parker" <bobp@bluebottle.com> wrote in message
news:mtrahv4cmqegq34q9d67a2mr3i4lv91mh2@4ax.com...

After the flaming Don McKenzie got for innocently trying to alert
people here to something useful and on-topic he was selling a few
months ago, I thought I should be at least a little bit obsequious.

That was cause he kept continually spamming the NG with advertisments for
his company.

 

[Martin, VK2UMJ]

You may not have much choice but to order them from outside Melb. WES
Components in Sydney seem to stock them, phone (02) 9798 9233, Part # P541
(plug) & S521 (socket). Maybe you can find an electronics store/repairer
that orders from WES and get them to order some in for you with their next
order, if you don't want to order them yourself.


"Data888" <kcinSPAMBLOCK@bigfoot.com.au> wrote in message
news:3F1620C9.20907@bigfoot.com.au...

One of these:

http://www1.jaycar.com.au/productView.asp?ID=PP0602&CATID=35&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=433
but one that crimps onto the cable. Part BC87151 shown here:
http://www.hillsantenna.com.au/catalog/connectorsadaptorslo.pdf
Sorry, can't link direct because it's a PDF. I just can't find anywhere
that sells them.

Nick



Steve wrote:
Data888 <kcinSPAMBLOCK@bigfoot.com.au> wrote in message
news:<3F155E0C.8030301@bigfoot.com.au>...


Does anyone know where in Melbourne (preferably near the city) that
sells crimp type PAL TV line plugs & sockets like Foxtel installers
use?
I have found a few mailorder places online, but I don't really want to
mailorder a few plugs...


Ok, lets get to the bottom of this. Is it a BNC, like this?

(what ridiculous URLs!)


http://www1.jaycar.com.au/productView.asp?ID=PP0647&CATID=&keywords=BNC&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=

Or is it an f-connector or an "RF" connector, like these? (the f
connector is the one on the left with the screw thread connection);


http://www1.jaycar.com.au/productView.asp?ID=WV7384&CATID=36&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=477


You'll still need a crimping tool, and that is gonna set you back a
fair bit (maybe $60). Also, you'll have trouble stripping the cable
correctly unless you have one of these $25 doovies;


http://www1.jaycar.com.au/productView.asp?ID=TH1820&CATID=&keywords=coax+stripper&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=

My Foxtel installation has an f-connector cable from the dish to the
receiver (ie; aerial connection).

It then has a TV coax type connector (commonly called and RF plug)
connecting video and audio together into the tuner section of my VCR
(also a type of aerial or RF connection). I can tune my VCR into
Foxtel via this connection.

It also has RCA cables connecting the video and STEREO audio directly
to the line in of my VCR ("normal" video and audio signals). This
type of connection does not require that I tune the VCR.
The RCA that connects the VIDEO signal may on some devices be a BNC
instead.

nifty

 

[Phil Allison]

"McBarry" <McBarry@Swiftdsl.com.au> wrote in message
news:3f167239$0$6693$41ce378f@news.swiftel.com.au...

Hi,
am repairing a CANON Bubblejet printer (BJC40OJ)
Diac right after the AC connector to main board cooked - marked as part
X001
on ther board

Markings are:

471

E 45

in front of the 45 is a symbol like an E but it has about 8 horizontal
lines
instead of the 3 which an "E" has..

Can anyone ID it for me so I can get another one??

** Even if it was identified buying **one** somewhere could be a big
problem.

Diacs are rare these days and Farnell list only two similar ones in
their catalogue for less than $1 each.

You could take a punt on one of them.



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

 

[Bob Parker]

"Rod Speed" <rod_speed@yahoo.com> wrote:

It does have one hell of a 'why dont you go and fuck yourself' glare tho |-)

Only because I was sticking a camera lens in its face when it just
wanted to sleep...

None of the neighbours cats have anything like that glare.

Follow them around with a camera and see what happens!

That cat looks like it would just start ripping
strips off your leg if it was feeling a tad peckish.

To say nothing of what it would do to an anklebiter.

Nah, that is one of the most docile animals I've ever seen. Except
when feeding time arrives.

You should have had a warning so we could reach for the spew bucket |-)

OK, I'll remember to put an advanced "obsequiousness" warning in my
future off-topic postings.




Hate spam? Go to http://www.bluebottle.com (It's free)

 

[Rob Judd]

I don't have it, but I do recall it being specific to only one model of
Arlec charger.

Rob


waxhead wrote:

Can anyone point me to a copy (preferably electronic!) of the circuit
diagram for the EA kit "Add-on Regulator for 12V Chargers" which appeared in
the Jul-97 issue of EA? I can get the artwork in .pdf format from the old
EA web site, but can't find the circuit diagram anywhere.

Out of interest, has anyone built this regulator, and is it any good (I note
that DS sell it as a kit for ~$30)

Cheers,
Wax