Remote XY lets you create graphical interfaces for smartphones.The battery holds a pull-down resistor (connected to either the ground or ve terminal) inside the battery casing.My trusty digital LCR meter showed me that its an 82-k resistor for the Nokia BL-5CT-type Li-ion battery (3.7 V1,090 mAh).
Thus, I added an 82-k 1 resistor between the second and third terminals of connector J2 in my battery emulator circuit to dupe the mobile phone. The circuit based on the popular three-pin adjustable voltage regulator LM317T (IC1) receives external dc input of 9 V2 A through input connector J1. The output voltage available at connector J2 can be adjusted from just below 3 V to just above 4 V with the help of the 500- multi-turn preset pot (RP1). Although most devices powered by Nokia batteries appear to work well at about 4.2 V, a little bit of experimentation with the values of resistors R2-R3-RP1 may be necessary. As stated earlier, the 82-k resistor (R4) is essential to fooling the device into thinking that a real battery is attached at its battery connector. However, in this application, a heatsink would definitely be required, and the TO-220 heatsink should be chosen because its thermal resistance will keep the temperature of the attached regulator well below its maximum tolerable temperature. Finally, try to link connector J2 with a suitable Nokia battery adapter to make the interconnection an easy task. Some other resistor values used in Nokia batteries are shown below. Check this checkbox to get notifications of followup comments via e-mail.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |