Circuit Schematic Mobile Phone Battery Emulator using LM317 Regulator IC

Battery. - This is one an electronic circuit schematic of Mobile Phone Battery Emulator using LM317 Regulator IC look like in Figure 1 below. In this circuit schematic the basic component used is LM317 T as the regulator component. 

In here we will give you global description about this circuit schematic of Mobile Phone Battery Emulator using LM317 Regulator IC and then we will give you link to continue your reading from original source as external website.

Circuit Schematic

Figure 1. Circuit Schematic of Mobile Phone Battery Emulator using LM317 Regulator IC (Courtesy of Electroschematics)

Component Part

• LM317
• Resistors
• LED
• Capacitors
• Variable resistor

Description

Circuit schematic like in Figure 1 above is Circuit Schematic Mobile Phone Battery Emulator using LM317 Regulator IC. Electroschematics site describe that the typical target voltage of the Li-ion battery is 4.2 V (note that the target voltage is not the same as the nominal voltage, as it is 3.7 V typical). An adjustable voltage regulator is designed as the mobile phone battery emulator. The circuit based on the popular three-pin adjustable voltage regulator LM317T (IC1) receives external dc input of 9 V/2 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-Ω 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-kΩ resistor (R4) is essential to fooling the device into thinking that a real battery is attached at its battery connector.

Note that the LM317T regulator can safely be used to dissipate up to 0.25 W without any external heatsinking. 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.

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