Nokia 8210 mobile phone travel charger circuit diagram

Nokia 8210 mobile phone  charger circuit diagram

 The Nokia 8210 mobile phone travel charger produced by Shanghai has been marked on the shell: input AC220V/50Hz(≤30mA),output 4.2V(≤200mA). When people use it to charge the 3.6V rechargeable lithium battery, the red light will be turned off and green light turned on when the it is charged to 3.98V. the whole charging time is about 4 hours. The op amp in the circuit is used as the comparator.