[NTLK] "Mobile" power supply for eMate 300

[Alexander Shendi]

Thank you! I've just ordered one. It should be almost perfect. The eMate has a 7.5V 9W power adapter (Same as the MP 2x00, I believe), which are by chance also the specs of this thingy. 

Am 23. August 2022 23:49:56 MESZ schrieb Avi Drissman <avi at drissman.com>:
>On Tue, Aug 23, 2022 at 3:29 PM Victor Rehorst <victor at chuma.org> wrote:
>
>> Unfortunately Newton devices are real picky and want input pretty much
>> no less than 6V and no more than 8V - see the FAQ:
>>
>> https://newtonfaq.com/newton-faq-hardware.html#IIB7
>>
>> USB-PD negotiation uses those fixed voltages, there's no way to
>> negotiate something in between - which is a shame.
>>
>
>There actually is, it's called USB PD PPS, and it allows the device to dial
>in a variable voltage. However, it's very new, and hard to find trigger
>boards for it.
>
>For something like 7.5V you could build off of
>https://myvolts.com/product/39078/Ripcord_USB_to_7.5V_DC_power_cable_compatible_with_the_Casio_ML-2_Keyboard
>. I don't know what the socket on the eMate looks like in dimensions or
>polarity, but there's your voltage.
>
>
>>
>> -V
>>
>> On 2022-08-23 10:07, Avi Drissman wrote:
>> > USB C has something called Power Delivery, where a suitably powerful
>> charger can deliver up to 240 W with voltages of 5, 9, 15, 20, 28, 36 or
>> 48V. That’s how laptops charge over USB C. And since it takes just a little
>> negotiation to get those voltages from an adapter capable of sending them,
>> you can get cables with the negotiation chips built in.
>> ----------------------------------------------------------------------
>>
>> http://newtontalk.net
>> http://twitter.com/newtontalk
>----------------------------------------------------------------------
>
>http://newtontalk.net
>http://twitter.com/newtontalk
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