Things which you can Learn:
*Application of voltage regulator IC LM7806.
*Concepts related to diode bridge rectifiers.
Mobile Phone Battery Charger
Price:(INR) -
150
Price:(USD) - 3
Price:(USD) - 3
Product Description
The Mobile Phone Battery Charger down-converts 220-240V AC mains supply to 9V AC with the help of a transformer (X1). The transformer output is rectified by diodes (D1-D4) wired in a bridge configuration and the positive DC supply is directly connected to the charger’s output contact. Build this circuit and charge your mobile hassle free.
Working:
A LED (LED2) works as a power indicator with a resistor (R1) serving as the current limiter while another LED (LED3) indicates the charging status. During the charging period, a 3V (approx.) drop occurs across a resistor (R2) which turns on the LED (LED3) through a resistor (R3).
An external DC supply source (for instance, from a vehicle battery) can also be used to energize the charger, where a resistor (R4) and a diode (D5), limits the input current to a safe value and provide for polarity protection respectively. A 3-terminal positive voltage regulator IC LM7806 (IC1) provides a constant voltage output of 6V DC. Since LED1 is connected across the common terminal (pin2) and ground rail of IC1, the output voltage is raised to 7.8V DC. LED1 also serves as a power indicator for the external DC supply.
Summary
Mobile phone chargers available in the market are quite expensive. The Mobile Phone Battery Charger is a low-cost solution which can charge a mobile’s battery (with a rating of 7.2V- such as the Nokia 6110/6150. ) from AC mains supply or external DC supply (such as a vehicle’s battery). No. of ICs used: 1.
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