PRC as a amplifier in GPS question.

"AJ" <itisme33@bigpond.net.au> wrote in message
news:qMQ8h.69991$rP1.50549@news-server.bigpond.net.au...
Hi All,

I am trying to find a 1 button 433MHz transmitter based on the common
HT12E encoder. Does anyone know where I can find such a beast locally?

Regards,


AJ
Click to expand...
Buy a wireless doorbell - alternatively those novelty R/C activated farting
gnome/santa, croaking toad toys might contain something similar.
 
AJ wrote:
Hi All,

I am trying to find a 1 button 433MHz transmitter based on the common HT12E
encoder. Does anyone know where I can find such a beast locally?

Regards,


AJ
Click to expand...
Hello AJ,

Are you only after a one-off or will there be quantity involved?

Andy
 
I am not sure about the decoder bit, but Jaycar has 433MHZ xmitters (and RX)
for $9.95 or so

David

AJ wrote:

Hi All,

I am trying to find a 1 button 433MHz transmitter based on the common HT12E
encoder. Does anyone know where I can find such a beast locally?

Regards,

AJ
Click to expand...
 
"Andy" <agw@woodtech.net.au> wrote in message
news:1164230601.540517.87870@m7g2000cwm.googlegroups.com...
AJ wrote:
Hi All,

I am trying to find a 1 button 433MHz transmitter based on the common
HT12E
encoder. Does anyone know where I can find such a beast locally?

Regards,


AJ

Hello AJ,

Are you only after a one-off or will there be quantity involved?

Andy
Click to expand...
Thanks to all or the replies so far.

I am looking for these things in quantities so would prefer something that
is already constructed and in an enclosure. I have come across a few 2 and
4 button ones but my customer really wants a 1 button. I have about 100 x
433MHz transmitters and heaps of encoders to go with them, I was hoping to
save some time tho and keep them in the spare parts box.

Best regards


AJ
 
"Jack" <Jack@yahoo.com> wrote in message news:45652a24@dnews.tpgi.com.au...
Hi I need to buy bulk AAA batteries for our wedding bomboneri's.
I found some on Ebay that sell them in bulk, they say that they have an
expiry date of 3 years.
Someone told me that batteries get weak by just sitting in a box, is this
true ?
Our wedding is in June 2007, should I buy now if I can get a good deal, or
should I wait till early next year ?

Thanks for any advice.
Click to expand...
What is on the bomboneri? Its unlikly for a battery to go so flat even after
10 years.
 
On 23/11/2006 20:18 Ross Herbert wrote:
On Thu, 23 Nov 2006 14:57:04 +1000, "Jack" <Jack@yahoo.com> wrote:

Hi I need to buy bulk AAA batteries for our wedding bomboneri's.
I found some on Ebay that sell them in bulk, they say that they have an
expiry date of 3 years.
Someone told me that batteries get weak by just sitting in a box, is this
true ?
Our wedding is in June 2007, should I buy now if I can get a good deal, or
should I wait till early next year ?

Thanks for any advice.



ALL batteries will self discharge while sitting unused on the shelf.
Depending upon the type of battery the rate of self discharge rate can
be infinitesimally small, as in the case of silver oxide or
camera/watch type batteries and Li-Ion for example, or quite high in
the case of carbon-zinc (obsolescent), or the Ni-Cd and Ni-MH types in
the rechargeables.

When it comes to the AA, AAA etc, (non-rechargeable) types then you
should only buy alkaline cells of reputable brand name since these
have a shelf life of at least three years from date of manufacture,
and then only if they are of Japanese manufacture. Chinese made
batteries (even with a well known Japanese brand name) are not as good
as those made elsewhere. Their shelf life is quite poor in my
experience.

Before buying bulk batteries which you intend to use next year you
should make sure they are current technology alkaline and that they
have a storage life date of 2009 or later. Good batteries don't
usually come cheap and if the price appears to be too good to be true,
then it probably is...
Click to expand...

Make sure they're not "Buzz" brand. I bought some cheap 9V alkaline
ones from Vorlac a long time ago. Every one of them leaked badly and
caused significant damage to the gear they were installed in.

If you're going to store batteries for a long time, put them in a
sealed container or bag in the fridge (not the freezer). I kept a Tandy
D cell in the fridge for about 9 years then used it and it still had
plenty of capacity.
 
On Thu, 23 Nov 2006 14:57:04 +1000, "Jack" <Jack@yahoo.com> wrote:

Hi I need to buy bulk AAA batteries for our wedding bomboneri's.
I found some on Ebay that sell them in bulk, they say that they have an
expiry date of 3 years.
Someone told me that batteries get weak by just sitting in a box, is this
true ?
Our wedding is in June 2007, should I buy now if I can get a good deal, or
should I wait till early next year ?

Thanks for any advice.
Click to expand...
Check around suppliers such as Jaycar, they sell 24 packs of AAA
Alkalines for $12.95 with discounts for 10 & 20 boxes.

This is substantially cheaper than the supermarkets and they seem to
work well. If you do find any duds, you will at least be able to
return them for refund.

Dave
 
Bob Parker wrote:

If you're going to store batteries for a long time, put them in a
sealed container or bag in the fridge (not the freezer). I kept a Tandy
D cell in the fridge for about 9 years then used it and it still had
plenty of capacity.
Click to expand...
Hmmmm... one wonders whether keeping it in the fridge for 9 years has
actually saved you money. ;)
 
On 24/11/2006 16:58 rowan194 wrote:
Bob Parker wrote:

If you're going to store batteries for a long time, put them in a
sealed container or bag in the fridge (not the freezer). I kept a Tandy
D cell in the fridge for about 9 years then used it and it still had
plenty of capacity.

Hmmmm... one wonders whether keeping it in the fridge for 9 years has
actually saved you money. ;)
Click to expand...
Sure! Tandy gave it to me for free back in 1993 when they were
running the Free Battery Club. :)
I never had a use for a single D cell, so it stayed in the fridge
for all that time. I finally connected it to an LM3909 LED flasher,
which it powered for a couple of years.
 
Bob Parker wrote:
On 24/11/2006 16:58 rowan194 wrote:
Bob Parker wrote:

If you're going to store batteries for a long time, put them in a
sealed container or bag in the fridge (not the freezer). I kept a Tandy
D cell in the fridge for about 9 years then used it and it still had
plenty of capacity.

Hmmmm... one wonders whether keeping it in the fridge for 9 years has
actually saved you money. ;)

Sure! Tandy gave it to me for free back in 1993 when they were
running the Free Battery Club. :)
Click to expand...
Hands up those who had more than one card? ;-)

Dave :)
 
On 24/11/2006 17:51 David L. Jones wrote:
Bob Parker wrote:
On 24/11/2006 16:58 rowan194 wrote:
Bob Parker wrote:

If you're going to store batteries for a long time, put them in a
sealed container or bag in the fridge (not the freezer). I kept a Tandy
D cell in the fridge for about 9 years then used it and it still had
plenty of capacity.
Hmmmm... one wonders whether keeping it in the fridge for 9 years has
actually saved you money. ;)
Sure! Tandy gave it to me for free back in 1993 when they were
running the Free Battery Club. :)

Hands up those who had more than one card? ;-)

Dave :)
Click to expand...


Me! I had one per year for a few years.

Surely you wouldn't suspect any of the upstanding honest denizens of
this esteemed newsgroup of cheating poor ol' Tandy into providing more
than one battery per month...? ;)

Bob
 
On 25/11/2006 01:00 rowan194 wrote:
Bob Parker wrote:
I can tell you for sure that Energizer 2.5AH AA NiMH cells rapidly
go weaker even if you don't use them. Their rate of self discharge is
amazingly high compared to others I've used, especially in this warmer
weather.

Good, it's nice to know I'm not going crazy. I use those for my camera
flash unit, and if I charge them fully then leave them for a week they
are virtually useless...
Click to expand...
Exactly the same with me. Last week I fully charged a set of them &
put them into my digital camera. When I went to take some photos 6 days
later, the low battery warning immediately came on.
I've got some old PowerBase 2AH cells which still have plenty of
charge in the same camera even after a few weeks, so it's not the camera
pulling a lot of current when turned off.
 
On 24 Nov 2006, rowan194 <googlegroups@sensation.net.au> wrote:

Bob Parker wrote:
I can tell you for sure that Energizer 2.5AH AA NiMH cells
rapidly
go weaker even if you don't use them. Their rate of self discharge
is amazingly high compared to others I've used, especially in this
warmer weather.

Good, it's nice to know I'm not going crazy. I use those for my
camera flash unit, and if I charge them fully then leave them for a
week they are virtually useless...
Click to expand...
Rate of self-discharge of NIMH is quite fast but nothing like what you
describe.

Your charger is probably overcharging the NiMHs. When this happens the
cells vent gas and go dry internally. Then they hold even less charge.
 
On 25/11/2006 18:52 Ali wrote:
Rate of self-discharge of NIMH is quite fast but nothing like what you
describe.

Your charger is probably overcharging the NiMHs. When this happens the
cells vent gas and go dry internally. Then they hold even less charge.
Click to expand...
I'm using a Lightning Pack 4000N charger which is well known for its
multiple methods of preventing overcharge. That's why I bought it.
It's only the Energizer 2.5Ah cells which are doing this. Duracell
2.65AH cells, Sony 2.1AH cells and PowerBase 2AH cells charged in it
don't have this problem.
 
"Bob Parker" <bobp.deletethis@bluebottle.com> wrote in message
news:4568061a$0$1608$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
It's only the Energizer 2.5Ah cells which are doing this. Duracell
2.65AH cells, Sony 2.1AH cells and PowerBase 2AH cells charged in it
don't have this problem.
Click to expand...
Everything else Eveready make is crap, so it's not that surprising their
NiMH are no exception.

MrT.
 
On Mon, 27 Nov 2006 19:02:47 +1100, "Mr.T" <MrT@home> wrote:

"Bob Parker" <bobp.deletethis@bluebottle.com> wrote in message
news:4568061a$0$1608$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
It's only the Energizer 2.5Ah cells which are doing this. Duracell
2.65AH cells, Sony 2.1AH cells and PowerBase 2AH cells charged in it
don't have this problem.

Everything else Eveready make is crap, so it's not that surprising their
NiMH are no exception.

MrT.
Click to expand...
I bought some NiMH batteries from the camera shop, 2500mAh powerbase
AA's from my speedlite (flash) and they have been going strong for
over a year now. These cells get abused too.
 
On 27/11/2006 19:38 The Real Andy wrote:
I bought some NiMH batteries from the camera shop, 2500mAh powerbase
AA's from my speedlite (flash) and they have been going strong for
over a year now. These cells get abused too.
Click to expand...
I bought my PowerBase 2AH cells in mid 2003 & they're still going
great. Sanyo 2.1AH and Jaycar PowerTech(?) 2.3AH ones have come and gone
while they've just kept going.
As for the Energizers, I've got a few sets of them & it looks like
it's only the 'oldest' (14 months) ones which have developed a very high
self discharge rate.
 
wombat@fancier.net wrote:

Can someone tell me whether Wombats live only in Australia,
or also on other continents?
Click to expand...
according to google: "australian slang wombat"
Wombat - a simple minded person.

I thinketh you can find them anywhere.


--
Don McKenzie
E-Mail Contact Page: http://www.dontronics.com/e-mail.html

Crystal clear, super bright OLED LCD (128x128) for your microcontroller.
Simple serial RX/TX interface. Many memory sizes.
http://www.dontronics-shop.com/product.php?productid=16460
 
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