Simple Mobile Phone Battery Charger

Simple Mobile Phone Battery charger circuit diagram

The 220-240V AC mains source is stepped down to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 connected in bridge configuration and the positive DC source is straightly wired to the charger”s output contact, while the negative terminal is connected through current limiting resistor R2.

LED2 operates as being a power indicator with resistor R1 serving as the current limiter and LED3 signifies the charging status. While in the charging period, about 3 volts drop happens across resistor R2, which switches on LED3 through resistor R3.

This schematic diagram come from circuit: Simple Mobile Phone Battery Charger.
Go to that page to read the explanation about above circuit design.

In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.

In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.

2 thoughts on “Simple Mobile Phone Battery Charger

  1. circuit diagram Post author

    yes, you can use center tap type of transformer. use only 9v and 0v for the circuit

  2. RK Murthy Challa

    Please let me know, can I use a 9-0-9V/250 mA Transformer in place of existing 0-9 V/250 mA ?

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