[NTLK] Wireless Charging (Grant Hutchinson)

Matthias Melcher m.melcher at robowerk.de
Thu Dec 23 03:12:15 PST 2021

Those charging circuits are very common now, and you can get them as five-packs starting at 2$US from Alibaba, including charge cicuit. ust google for "qi charge circuit".

I don't know the details of the MP charging circuitry, but I do know that there is little to none protection inside the MP, and a wrong charger can easily fry your Newton.

So, yes, getting a wireless charger to deliver electricity is very easy, but to make it absolute safe for the Newton is a bit more involved. The same problem exists with USB-C which easily delivers the voltage to run and charge the Newton, but voltage needs to be perfectly regulated and power must be limited by the new circuitry.

As for space, There is by todays standards lots of room within the Newton casing. There is always the space for the Modem module, and just as the ROM PCB fits between other boards, one could probably fit even more circuitry into the spaces creatively.

 - Matthias

> On 22. Dec 2021, at 22:35, Noah Leon <moosefuel at gmail.com> wrote:
> Yes, I think the chargers are based on the Qi standard if that is what the iPhone uses. I know Jake Bordens and maybe some others had done some work mapping out how the charging circuits work on the Newton, I wonder if there is enough room inside the case to put a coil directly inside the back? Most of these chargers are 5v circuits, and the Newton’s is 7v, so again I’m not sure if this would work.
> Creating a special battery pack might work ok but I think I would have to perhaps use smaller cells to make room for the chip and the coil, ad it would have to be a smaller coil. Then I don’t know much about how charging circuitry works so I am at a loss of how to direct the electricity to the right place.
> But if I had a little more info it might be a cool project for early next year. If I knew the best way to go about it I certainly would.
> Noah
>> On Dec 22, 2021, at 3:00 PM, newtontalk-request at newtontalk.net wrote:
>> The board itself is pretty small and the optional receiving coils are flat. You might be able to built this into a standard battery sled.
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