I have already build up a circuit with 12-0-12 1 Amp. Step Down Transformer against AC 220-240~. Connected bridge rectifier with 4 pcs. of IN4007
Diode 470 micro farad 50 volt electrolytic capacitor supplying 15.49 DC going to breadboard having 7805 Power Regulator IC with 470 micro farad in the output with 5.1volt Zener Diode. After that connecting USB jack to my Android phone. My phone is taking charges but as the time goes, voltage drops up to 4.42 Dc & taking long time for the ampere to fluctuate continuously e.g. .32mA max to 00 mA lowest?
Where is the fault actually ? Why it doesn't give constant output of 5 /5.01 volt dc with a constant Ampere during charging of my Android Phone ?
Awaiting for your valuable suggestion ?
Regards,
amit
Diode 470 micro farad 50 volt electrolytic capacitor supplying 15.49 DC going to breadboard having 7805 Power Regulator IC with 470 micro farad in the output with 5.1volt Zener Diode. After that connecting USB jack to my Android phone. My phone is taking charges but as the time goes, voltage drops up to 4.42 Dc & taking long time for the ampere to fluctuate continuously e.g. .32mA max to 00 mA lowest?
Where is the fault actually ? Why it doesn't give constant output of 5 /5.01 volt dc with a constant Ampere during charging of my Android Phone ?
Awaiting for your valuable suggestion ?
Regards,
amit