Re: [NTLK] Solar Powered Newton

From: speedy2 (
Date: Mon Mar 04 2002 - 17:54:36 EST

On Mon, 4 Mar 2002, Marco Mailand wrote:

> I made tests with a solar cell just as big as the lid of the MP2k is and was
> very satisfied. It didn't charge as fast as with the 1Ampere of the standard
> 9W AC adapter but it charged fully even with a low winter sun in Switzerland
> behind a window.
> Attention should be paid if your solar panel is capable of delivering more
> than 7.5V AND higher currents of lets say above 500mA, which might be the
> case in the southern US.

As you or someone else already pointed out, it would be a good idea to
regulate the solar panel. Depending on the voltage output, you could go
for a high-efficiency buck type regulator. Maxim & National Semi (among
many others) make one-chip solutions that would be perfect for you panel.

Though, the Newton itself will regulate the power, perhaps something
simple like a series diode+diode clamp+capacitor would do.


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