[Thinkpad] Auto adapter for A-series

[Rob Bell]

Thanks for the pointer to that IBM information.  I was able to score a 
'brand new' 10K3820 IBM auto power adapter from eBay for about $27, 
including shipping.  This one is 72W and is the right model for my A21p 
so I should be good to go.

Thanks for the other suggestions offered as well.

Rob

Stuart F. Biggar wrote:

> At 03:20 PM 12/26/2007, you wrote:
> 
>> Hi,
>>
>> Can anyone point me to a good source for an auto power adapter that will
>> work with the A21p?  This is the older, round-style plug.
>>
>> If I'd be better off getting a small DC-to-AC inverter and using the
>> normal power brick I can do that too.  How many watts does it need to
>> supply?
>>
>> Thanks,
>> Rob
> 
> 
> Rob,
> 
> I have an IBM auto/airline adapter that I've used with an A21p.
> However, it is at work and I'm at home (holiday closure).
> 
> If I remember correctly it is a 72 Watt device and I've also used
> it with a T43p (same tip).  Looking around with Google I find:
> 
> http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-62330
> 
> Which lists two possibilities a ways down the page.  You might be able
> to find one or the other on some site.
> 
> A different page shows the A21p using a 72 Watt device:
> 
> http://www-307.ibm.com/pc/support/site.wss/MIGR-4PJRRG.html
> 
> As for using an inverter, they aren't that efficient and the generally
> produce a fair amount of electrical noise which may or may not be a problem
> depending on the application.  I would guess an efficiency of about 80%
> (could be better or worse) so a 100 Watt device should power the 72 watt
> brick that came with my A21p allowing the TP to charge and operate.  I
> think I'd rather use the IBM device that directly converts 12 VDC to the
> 16 the TP uses rather than the two stage conversion.
> 
> Stuart
> 

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