@▷ Wireless phone backup battery circuit Diagram | Diagram for Schematic

Wireless phone backup battery circuit Diagram

This circuit can be used as the backup power supply on the wireless telephone. The battery type used is the Ni-Cd SANYO CLT-420 and the like. The principle of this circuit is, when the 220V AC power supply connected to the battery, it will recharge automatically. When the AC supply is unplugged, the battery will start to operate, and the LED indicator will light. Here is the schematic :

Wireless phone backup battery circuit diagram

Components list :
Diode D1-D3 : 1N4007
Resistor R1 : 1k ohm
Resistor R2 : 100 ohm
IC1 : LM317L
LED1 indicator : Green LED 5mm

Estimated price : $2

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