J
Jan Panteltje
Guest
It kept bugging me that this little player is uncontrollable as far a charging goes.
So decided to modify it.
After all this is a design group...
So still had some Microchip MCP73831T -2ACI (4.2V) lipo charger chips,
http://www.ebay.com/itm/360821069439
I mean 10 for 1$60, I payed 3$60 for 10 last year...
Anyways,
this is what I did, left the (it was 6.8 Ohm) series resistor in, removed the series diode,
added some tantalum 2.2 uF caps (no they draw no measurable current):
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_circuit_diagram_IMG_4749.JPG
Scratched some solder mask away and mounted the stuff:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_close_up_IMG_4745.JPG
And looked up that MCP73831 programming resistor, decided to settle for 22k should give about 30 mA in the datasheet.
So there you are:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_charging_IMG_4743.JPG
It is now chargibg, BUT WILL IT STOP????
SUSPENSE!!!
More in the next episode of
LOL
So decided to modify it.
After all this is a design group...
So still had some Microchip MCP73831T -2ACI (4.2V) lipo charger chips,
http://www.ebay.com/itm/360821069439
I mean 10 for 1$60, I payed 3$60 for 10 last year...
Anyways,
this is what I did, left the (it was 6.8 Ohm) series resistor in, removed the series diode,
added some tantalum 2.2 uF caps (no they draw no measurable current):
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_circuit_diagram_IMG_4749.JPG
Scratched some solder mask away and mounted the stuff:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_close_up_IMG_4745.JPG
And looked up that MCP73831 programming resistor, decided to settle for 22k should give about 30 mA in the datasheet.
So there you are:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_charging_IMG_4743.JPG
It is now chargibg, BUT WILL IT STOP????
SUSPENSE!!!
More in the next episode of
LOL