Home Made Mobile Phone Charger

[Dinesh Wick]

Hello Everyone,

I am trying to build a mobile phone charger (For my Samsung phone) by myself using following components.

• Step down transformer (from 230V to 9V 1200mA)
  
• Bridge Rectifier
  
• 1000uf capacitor (To smooth the DC voltage)
  
• 7805 Regulator (To get output voltage 5V)
  
• A micro USB cable I got from a broken charger.
  

Appreciate if you can share your thoughts regarding this.

Will this harmful to the phone or will this work better than the low quality Chinese chargers?

 

[audioguru2]

The datasheet for a u7805 voltage regulator says its minimum input voltage is 7V. The 9VAC transformer has a peak voltage of 12.7V and the bridge rectifier reduces it to 10.9VDC so it will be fine when filtered by the 1000uF capacitor. It will not harm a phone because the phone has the charging circuit inside it.