[Cumulus] Some Cumulus experiences

[Eggert Ehmke]

On Thursday 04 August 2011 10:46:32 Hendrik Hoeth wrote:
> Thus spake Peter Turczak (peter at turczak.de):
> > While building my own adapter for the N810 I stumbled across the same
> > problem. When the current of the adapter is _not_ current limited the
> > Nokia devices will consider it a "special" cable. See
> > http://www.herjulf.se/solar/charge-station/Nokia_2-mm_DC_Charging_Interf
> > ace_Specification_v1_2_en.pdf for details. The N810 expects a source
> > resistance of about .5 Ohms. I cracked open a cheap 3rd party charger
> > and found a .56 Ohms/1W
> > resistor in line with the +5 Volts ;).
> 
> That's good to know. Thanks for this bit of information!

I rebuild my adapter based on a LM317 regulator. That can be adjusted by a 
trim resistor. I also have a 0.56 Ohm resistor at the output now. Have not 
tested it as my adapter cable is at the airport, will report when it works.
Eggert