My recently bought N800 cannot charge over its USB port (what an utterly stupid design decision!), but the Nokia charger delivers 5V. Since this is the supply voltage of USB, I thought I would buy an adapter. So yesterday I walked into the cell-phone shop and asked. They had one. It cost 79 CHF. (about 50 Euros).
I am afraid I laughed into the face of the poor salesman. He got indignant and told me that he wasn't the one setting the prices. True enough I guess, but I was too busy laughing to reassure him.
Anyway, I decided to build my own USB charger cable. In the photo below you can see the ingredients: (clockwise) A soldering station, callipers, an old Nokia 3.5mm to 2mm converter, shrink-tube and an USB cable in the middle.
I cut of the 2 mm Nokia connector and the male USB connector, and removed the isolation from the cables. Thankfully they are colour-coded: Black for ground and red for 5V. The white and green USB data cables are not needed and get cut off.
Btw, it is important to put on the shrink-tube before soldering anything...
2 minute later: Connections soldered and covered in shrink-tube. I debated whether I should put in a diode, but then couldn't be bothered, and it shouldn't be necessary anyway.
....aaand here we are: Not pretty, but it basically cost nothing, and it does the job.
1 week ago