From: Joel M. Sciamma (joel_at_inventors-emporium.co.uk)
Date: Thu Feb 10 2005 - 03:28:10 PST
Sonny,
> Has anyone heard of a Car adapter for the Newton line?
Apple did make a car adaptor for the Newt, I have one here and it looks
nicely made for this kind of device with a car-type 3A fuse, sprung centre
pin and solid construction.
Opening it I see that they used the popular LM317 adjustable regulator chip
in its basic circuit configuration.
<http://www.national.com/pf/LM/LM317.html>
I just tested it on the bench and it delivers a no-load output voltage of
6.99V for inputs of 9V to 15V (car batteries are normally charged at 14.5V)
With a 400mA load the output drops to 6.75V
So an adaptor with similar characteristics should be fine.
The prices you have been given seem very high for such a simple device.
Joel.
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