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Mp3 player adapter

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freak89

New Member
Hello every body
i hope you are okay :D

Now i have an old usb flash-Mp3 player it is consume alot of power so it need more batteries and " she got no money in the bank" :D i mean i have no money so i get an old nokia charger 5V-890mA and wired it with an old usb cable
only pins 1 with VCC and pin 4 with GND

it starts but soon it say " LOW POWER " and it also can be powered when i plug it in Computer although the usb from computer can derive 5v-200mA as i know

can you tell me where is the ERROR ?? :rolleyes:
 

freak89

New Member
it is like those ones

 

ezpcb.com

New Member
Hi Freak

I know where's the problem as I had designed many many MP3 circuits. The charging circuit is controled by the micorcontroller inside the MP3. Charging won't be triggered on unless a real USB connection is detected. In some circuit you can start charging by connect a 1.5k resistor betwwen D+ and VCC. In most player you can't start charging unless connect it to a real computer
 
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