PRC as a amplifier in GPS question.

[Ken Taylor]

"Angelo Sartore" <fangio@netspace.net.au> wrote in message
news:blgq53$10k8$1@otis.netspace.net.au...

US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?



PT78ST112H from Arrow - Been there, as well as Avnet & Insight. All have
either never imported or don't have stock!
Any other ideas?

Angelo Sartore

Melbourne
AUSTRALIA

ADOPT, ADAPT, INVENT, DESTROY !

Is that a Dalek sig?

Use Arrow in the States, they have stock IIRC.

Ken

 

[Mike Harding]

On Fri, 3 Oct 2003 09:25:32 +1200, "Ken Taylor" <ken123@xtra.co.nz>
wrote:

Use Arrow in the States, they have stock IIRC.

How does the cost (including shipping) work out if
you're only buying 1 or 2 pieces?

Will they sell to you?! I have had trouble in the past
with US manufacturers telling me to use their
Australian agent and refusing to deal direct. I assume
Arrow US and Arrow Oz/NZ are related?

Mike Harding

 

[budgie]

On Fri, 3 Oct 2003 09:25:32 +1200, "Ken Taylor" <ken123@xtra.co.nz>
wrote:

"Angelo Sartore" <fangio@netspace.net.au> wrote in message
news:blgq53$10k8$1@otis.netspace.net.au...
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?



PT78ST112H from Arrow - Been there, as well as Avnet & Insight. All have
either never imported or don't have stock!
Any other ideas?

Angelo Sartore

Melbourne
AUSTRALIA

ADOPT, ADAPT, INVENT, DESTROY !

Is that a Dalek sig?
Use Arrow in the States, they have stock IIRC.

But don't Arrow in the states just redirect you back to that POS
called Arrow Oz?

 

[budgie]

On Fri, 03 Oct 2003 09:06:40 +1000, Mike Harding
<mike_harding1@nixspamhotmail.com> wrote:

(snip)

I assume Arrow US and Arrow Oz/NZ are related?

Father and son, or should I say hooker and brothel sprout.

Apart from their rank arrogance and dubious sales practices, the
biggest single problem with Arrow Oz is that they b/o through Arrow
US, who then b/o from the manufacturer's US site. This results in
factory MOQ presented to the end-user, and happened to us with an
order for Maxim stuff. Hence we no longer source Maxim from Arrow,
but use an offshore source.

 

[John Robertson]

Hmmm, if you know the current draw of your motor under load, then why
not use a dropping resistor in line to reduce the input voltage to the
7812 to something in the close order of 15 - 17VDC under load? Your
7812 would then only have to drop around 3 - 5VDC and thus would be
running much cooler.

Could the resistor be placed near the voltage source and allowed to
cool itself there? Thus your box would be much cooler and the risk of
thermal shutdown of the 7812 reduced substantially.

John :-#)#

On Thu, 02 Oct 2003 10:13:46 GMT, "HH" <hh@hotmail.com> wrote:

Hello John,
I have the whole thing enclosed in a jiffy box, and the heat build up
causes (I think) the 7812 to shut down, I have heat sinked the 7812 and put
a tiny fan on the jiffy box, and its OK, but I am trying to keep the cost
and production time down. The heat is such that I cannot put my finger on
the heatsink.
It has just occurred to me, what if I used a 7824, a 7818 and finally a 7812
in series? Would this decrease the heat?
Harry Harms

"John Robertson" <jrr@flippers.com> wrote in message
news:suannvk4713s31bfvcjb9sftc0d67vlti6@4ax.com...
One question is why is the heat from the 7812 such a problem? If you
can mount it on a metal frame or some such it can source up to about
1.5A into a load, almost any regulator is going to produce heat if you
draw current through it - getting rid of the heat is the problem it
seems to me. 7812's can handle up to around 35VDC (AIR) input voltage
and you could add a dropping resistor in series with the front end of
the regulator to reduce the heat generated in the 7812...

John :-#)#

On Wed, 01 Oct 2003 10:23:18 GMT, "HH" <hh@hotmail.com> wrote:

Thanks to all, after reading your responses, it would seem that I will
have
to resort to 2 x plug packs, one 24v & 12v.
I appreciate your input
Harry Harms
"Ken Taylor" <ken@home.nz> wrote in message
news:b%veb.164517$JA5.4057339@news.xtra.co.nz...
"budgie" <budgie@nowhere.cantech.net.au> wrote in message
news:3f7a601b.1181192@news.cantech.net.au...
On Wed, 1 Oct 2003 12:09:04 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:

"Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor"
ken123@xtra.co.nz
wrote:

The PT78STxxx product line is a switch-mode drop-in replacement
for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.

Indeed they are. However the price, from Farnell, of $59.12
each is not!

Mike Harding

US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in
single
quantities. Not LM78xx series for sure, but how much heat do you
want?


Either way, a lower Vin from another wall wart would be a simpler
fix.

Absolutely!

Ken




(Please post followups or tech enquires to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

(Please post followups or tech enquires to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

 

[skozzy]

most tv/capture cards with the TB848 and variants can do what your after.

"JGCasey" <kjcasey@hotkey.net.au> wrote in message
news:3f7e4589_1@news.iprimus.com.au...

Hi,

Are there any pc tuner/grabber cards which can be accessed via your own
software?

I am interested in using a remote camera + transmitter and plugging the
receiver into a pc tuner card to capture and process the images.

John

 

[skozzy]

thats, BT848


"JGCasey" <kjcasey@hotkey.net.au> wrote in message
news:3f7e4589_1@news.iprimus.com.au...

Hi,

Are there any pc tuner/grabber cards which can be accessed via your own
software?

I am interested in using a remote camera + transmitter and plugging the
receiver into a pc tuner card to capture and process the images.

John

 

[JGCasey]

"skozzy" <ask_me_for_my@email.address.com> wrote in message
news:3f7ed062$1_1@news.iprimus.com.au...

most tv/capture cards with the TB848 and variants can do what your after.

The problem is getting the information on *how* to do it!

My experience is mainly in Assembler, Basic and C.

"JGCasey" <kjcasey@hotkey.net.au> wrote in message
news:3f7e4589_1@news.iprimus.com.au...
Hi,

Are there any pc tuner/grabber cards which can be accessed via your own
software?

I am interested in using a remote camera + transmitter and plugging the
receiver into a pc tuner card to capture and process the images.

John

 

[HH]

By doing this will it affect the speed of the motor? I don't need much
speed.
Harry

"Clifford Heath" <cjh_nospam@managesoft.com> wrote in message
news:1064877953.634913@excalibur.osa.com.au...

Any reason you can't modify the PWM circuit to handle 28V in?
Pulses of 28V are unlikely to hurt your motor as long as the
average current isn't too high.

 

[CyBorg 0091]

It looks Microwavish.

Look for microwave transmitters or relays or recivers,one or the other.
Looks like something off a relay station if you ask me.

alt.solar.themal....lol

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...

please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Leon The Peon]

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...

please!

I may be a little cross -posting I need more people to teach me about
antenna.

Its a parabolic reflector - it concentrates receives signal by reflecting
it back toward the black cylinder.

I am guessing that its a passive (no semiconductors) wireless lan dish - I
guess that the black cyliner is just a waveguide.


The black cylinder has its diamter chosen to receive the target frequency.


Microwave dishes require a gunn diode, gunn diodes dmt come installed in
black cylinders !!

Also microwave disheases arent so amateur.

So it appears to be less than microwave or satellite. and that means
wireless lan.







---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.522 / Virus Database: 320 - Release Date: 29/09/2003

 

[red ted]

plonk is the sound you hear just before you flush the turcaud

 

[Peter Lowrie]

Bite the bullet and go back to Linux.
Peter

 

[Mr Sze Lee]

Unit to let
Hi, we are 2 international students currently studying in UQ. Occupying an
ensuit unit at Durham Sreet. We are currently looking for someone to occupy the
unit from end of November 2003 till 2004. It is just 10 mins walk to St Lucia
campus, 1 min to the nearest provision shop and 5 mins walk to the nearest ferry
terminal and 15 mins travel to the city. Both bedrooms are furnished with a bed,
wardrobe and each comes with an individual toilet. Cooking equipment and
utensils are provided. The rent will be $240 per week. Other than that, white
goods like microwave, oven, a fridge and a brand new washing machine will come
with the unit. Interested, pls feel free to contact Steven (0422604535) or Frank
(0411176791) from now till end of November 2003. Thank U.

 

[Dr LG]

Like one of those wifi antennas for 2.4ghz only its round.. Point link for
something. Very direction and a little more stylish then most.
Could be a tx or rx link for vid/audio, data link, pay tv antenna, an rx
antenna for monitoring a 1.8 or 2.4ghz or such cordless phone, ummm can't
think of any more atm.


"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...

please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Jack]

helical grid dish antenna
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=helical+antenna+

Jack

Dr LG wrote:

Like one of those wifi antennas for 2.4ghz only its round.. Point link for
something. Very direction and a little more stylish then most.
Could be a tx or rx link for vid/audio, data link, pay tv antenna, an rx
antenna for monitoring a 1.8 or 2.4ghz or such cordless phone, ummm can't
think of any more atm.

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...
please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Mylinux]

all 6 pages are read.


none of them belongs to the one that I took the digital pic.




Jack <szachownica2002@yahoo.com.au> wrote in message
news:3F8150DF.64B84484@yahoo.com.au...

helical grid dish antenna
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=helical+antenna+

Jack

Dr LG wrote:

Like one of those wifi antennas for 2.4ghz only its round.. Point link
for
something. Very direction and a little more stylish then most.
Could be a tx or rx link for vid/audio, data link, pay tv antenna, an rx
antenna for monitoring a 1.8 or 2.4ghz or such cordless phone, ummm
can't
think of any more atm.

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...
please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Jack]

the antenna you are asking for is built of helical antenna and dish.
for dish antenna go there
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=dish+antenna

for helical as before

you can visit eBay on-line auction site

if you are looking for a name of a manufacturer
go back to that place, city and just ask for or call the owner.
If the phone number is not avaliable, call local computer shops, ISPs.

Mayby your antenna was made by local workshop.

Jack

Mylinux wrote:

all 6 pages are read.

none of them belongs to the one that I took the digital pic.

Jack <szachownica2002@yahoo.com.au> wrote in message
news:3F8150DF.64B84484@yahoo.com.au...
helical grid dish antenna
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=helical+antenna+

Jack

Dr LG wrote:

Like one of those wifi antennas for 2.4ghz only its round.. Point link
for
something. Very direction and a little more stylish then most.
Could be a tx or rx link for vid/audio, data link, pay tv antenna, an rx
antenna for monitoring a 1.8 or 2.4ghz or such cordless phone, ummm
can't
think of any more atm.

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...
please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Jack]

the antenna you are asking for is built of helical antenna and dish.
for dish antenna go there
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=dish+antenna

for helical as before

you can visit eBay on-line auction site

if you are looking for a name of a manufacturer
go back to that place, city and just ask for or call the owner.
If the phone number is not avaliable, call local computer shops, ISPs.

Mayby your antenna was made by local workshop.

Search for grid dish antenna too.

http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=grid+dish+antenna

Jack

Mylinux wrote:

all 6 pages are read.

none of them belongs to the one that I took the digital pic.

Jack <szachownica2002@yahoo.com.au> wrote in message
news:3F8150DF.64B84484@yahoo.com.au...
helical grid dish antenna
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=helical+antenna+

Jack

Dr LG wrote:

Like one of those wifi antennas for 2.4ghz only its round.. Point link
for
something. Very direction and a little more stylish then most.
Could be a tx or rx link for vid/audio, data link, pay tv antenna, an rx
antenna for monitoring a 1.8 or 2.4ghz or such cordless phone, ummm
can't
think of any more atm.

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...
please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Dick Carroll]

Mylinux wrote:

all 6 pages are read.


none of them belongs to the one that I took the digital pic.

It's as center-feed parabolic. The reflector curve is calculated
matnematically so that most energy striking the dish from the front
will be reflected into the feedpoint. These antennas have very large
amounts of gain compared to almost any other, on the order of 37dB or more.
Most parabolic reflectors are solid or mesh instead of slotted as this
one is. Richard Harrison presented the description of how this slotted
version works.

Dick