[NTLK] "Mobile" power supply for eMate 300

[Alexander Shendi]

Website says it's center positive. But I'll check with a voltmeter.

Am 24. August 2022 13:12:15 MESZ schrieb Vladislav Korotnev <vladkorotnev at gmail.com>:
>Oh, it's not even Type C but simple USB, as long as it can send out 2.5A. 
>Be careful with the polarity though!
>I'll keep this option in mind whenever I get to using my Newts again too.
>
>On Wed, 24 Aug 2022 09:59:53 +0200
>Alexander Shendi <Alexander.Shendi at web.de> wrote:
>
>> 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  
>
>----------------------------------------------------------------------
>
>http://newtontalk.net
>http://twitter.com/newtontalk
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