third-party power adaptor

2005-01-20 Thread Tim Hodgson
Hi,

I asked this question yesterday, but as an addendum to a not-really-
related topic, so it may have been overlooked.

I've just bought a Micro Accessories power adaptor for my pismo. It's
this one, from OWC:

http://eshop.macsales.com/Catalog_Item.cfm?ID=6431Item=MICACADPTG3

 This is sold as a Powerbook G3 adaptor, and I was told that it is
suitable for a pismo, but I noticed that it's rated at 65W, whereas the
original Apple adaptor is 45W. I'm fairly sure this is not a problem, but
before I barbecue my Powerbook, can anyone confirm that?

thanks,

TimH


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Re: third-party power adaptor

2005-01-20 Thread Ben Dyer
The power rating simply indicates how much current the adapter can 
supply without burning out. Using a higher-rated power supply is fine; 
if anything, it will lead to fewer adapter heat problems.

Cheers,
Ben
On 20 Jan 2005, at 20:57, Tim Hodgson wrote:
Hi,
I asked this question yesterday, but as an addendum to a not-really-
related topic, so it may have been overlooked.
I've just bought a Micro Accessories power adaptor for my pismo. It's
this one, from OWC:
http://eshop.macsales.com/Catalog_Item.cfm?ID=6431Item=MICACADPTG3
 This is sold as a Powerbook G3 adaptor, and I was told that it is
suitable for a pismo, but I noticed that it's rated at 65W, whereas the
original Apple adaptor is 45W. I'm fairly sure this is not a problem, 
but
before I barbecue my Powerbook, can anyone confirm that?

thanks,
TimH

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Re: third-party power adaptor

2005-01-20 Thread Tim Hodgson
Ah, thanks for that Ben. As a supposedly techno-literate person, I really
should understand the basics a bit better :)

On Thu, Jan 20, 2005 at 10:48 am +1100, Ben Dyer wrote:

The power rating simply indicates how much current the adapter can 
supply without burning out. Using a higher-rated power supply is fine; 
if anything, it will lead to fewer adapter heat problems.

Cheers,
Ben

On 20 Jan 2005, at 20:57, Tim Hodgson wrote:

 Hi,

 I asked this question yesterday, but as an addendum to a not-really-
 related topic, so it may have been overlooked.

 I've just bought a Micro Accessories power adaptor for my pismo. It's
 this one, from OWC:

 http://eshop.macsales.com/Catalog_Item.cfm?ID=6431Item=MICACADPTG3

  This is sold as a Powerbook G3 adaptor, and I was told that it is
 suitable for a pismo, but I noticed that it's rated at 65W, whereas the
 original Apple adaptor is 45W. I'm fairly sure this is not a problem, 
 but
 before I barbecue my Powerbook, can anyone confirm that?



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Re: third-party power adaptor

2005-01-20 Thread rob
When I bought my newest powerbook, the Genius at the Apple Store told 
me that I could use any of the adaptors interchangeably with any of my 
currently in use 'books (a wallstreet 300, TiBook 667, AlBook 12 1.33, 
AlBook 15 1.5) (as long as the connection fits) except for the 15  
which needs a 65W adapter.  I have 2 45W apple adapters, 2 65 W apple 
adapters and a Madsonline 65 W adapter.

On Jan 20, 2005, at 5:57 PM, Tim Hodgson wrote:
 This is sold as a Powerbook G3 adaptor, and I was told that it is
suitable for a pismo, but I noticed that it's rated at 65W, whereas the
original Apple adaptor is 45W. I'm fairly sure this is not a problem, 
but
before I barbecue my Powerbook, can anyone confirm that?


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Re: third-party power adaptor

2005-01-20 Thread David Lesher
Tim Hodgson wrote:
 This is sold as a Powerbook G3 adaptor, and I was told that it is
suitable for a pismo, but I noticed that it's rated at 65W, whereas the
original Apple adaptor is 45W. I'm fairly sure this is not a problem, but
before I barbecue my Powerbook, can anyone confirm that?
No problem at all. If the adapter supplies 24vdc at the amperage you 
need, any reserve capacity is gravy.

Note that using a 45W on a 65W book is unlikely to be fatal as well.
a) The PSU only works hard when BOTH recharging a dead battery and 
running the book.

b) They are switcher supplies; if you DO attempt to pull too much 
current, it will do two things: get a little warm and reduce its output 
voltage. As a result, the laptop battery will recharge slowly, or maybe 
just keep up. One of the 3rd party suppliers [?iGo? maybe] tells you that.


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Re: third-party power adaptor

2005-01-20 Thread Tim Hodgson
On Thu, Jan 20, 2005 at 2:05 pm -0500, David Lesher wrote:

Tim Hodgson wrote:

  This is sold as a Powerbook G3 adaptor, and I was told that it is
 suitable for a pismo, but I noticed that it's rated at 65W, whereas the
 original Apple adaptor is 45W. I'm fairly sure this is not a problem, but
 before I barbecue my Powerbook, can anyone confirm that?
 
No problem at all. If the adapter supplies 24vdc at the amperage you 
need, any reserve capacity is gravy.

OK, many thanks. That leads to one last question! The Apple adaptor says
its output is 1.875A; the new adaptor says 3.61-2.70A (TYP. 2.7A). Any
problem there?

TimH



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Re: third-party power adaptor

2005-01-20 Thread Ben Dyer
No, no problem. Current and power, when indicated on the adapter 
itself, are to be treated as maximum ratings (there's normally a bit 
of wiggle room, though). So, the *actual* current and *actual* power 
output will be determined by the load.

Cheers,
Ben
On 21 Jan 2005, at 01:36, Tim Hodgson wrote:
OK, many thanks. That leads to one last question! The Apple adaptor 
says
its output is 1.875A; the new adaptor says 3.61-2.70A (TYP. 2.7A). 
Any
problem there?

TimH

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Re: third-party power adaptor

2005-01-20 Thread Clark Martin
At 9:48 PM +1100 1/20/05, Ben Dyer wrote:
The power rating simply indicates how much current the adapter can 
supply without burning out. Using a higher-rated power supply is 
fine; if anything, it will lead to fewer adapter heat problems.
Just to add this, with some power adapters using one of the correct 
voltage but excess current CAN cause a problem.  That is because the 
voltage isn't regulated and if you don't load it enough the voltage 
is actually quite a bit above the rated value.  Depending on the 
load, this could do some damage.  This DOESN'T apply with the these 
Apple power adapters as they are regulated.

Cheers,
Ben
On 20 Jan 2005, at 20:57, Tim Hodgson wrote:
Hi,
I asked this question yesterday, but as an addendum to a not-really-
related topic, so it may have been overlooked.
I've just bought a Micro Accessories power adaptor for my pismo. It's
this one, from OWC:
http://eshop.macsales.com/Catalog_Item.cfm?ID=6431Item=MICACADPTG3
 This is sold as a Powerbook G3 adaptor, and I was told that it is
suitable for a pismo, but I noticed that it's rated at 65W, whereas the
original Apple adaptor is 45W. I'm fairly sure this is not a problem, but
before I barbecue my Powerbook, can anyone confirm that?

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Redwood City, CA, USA
Macintosh / Internet Consulting
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Re: third-party power adaptor

2005-01-20 Thread David Lesher
Clark Martin wrote:
At 9:48 PM +1100 1/20/05, Ben Dyer wrote:
The power rating simply indicates how much current the adapter can 
supply without burning out. Using a higher-rated power supply is fine; 
if anything, it will lead to fewer adapter heat problems.

Just to add this, with some power adapters using one of the correct 
voltage but excess current CAN cause a problem.  That is because the 
voltage isn't regulated and if you don't load it enough the voltage is 
actually quite a bit above the rated value.  Depending on the load, this 
could do some damage.  This DOESN'T apply with the these Apple power 
adapters as they are regulated.
As is virtually ANY laptop adapter as they are switching supplies. 
 The simple wallwarts that sell wholesale for $1-2 each are not. 
There, the above is true to some extent.

Anytime the 'adapter' is: a) Dual voltage in [120-240v'] and/or b) 
greater than 30 watts out c) in a flat skinny case; it's bound to be a 
switching supply  regulated.


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