Hello All,
I am in the process of making a regulated power supply to convert AC(220V, 60Hz) to DC(9V, 500ma). I have worked out all the calculations and would appreciate if someone could double check just to make sure they are alright.
My setup is as follows
AC(220,60Hz) -> Transformer(12V,500ma) -> Bridge Rectifier -> Voltage Regulator(7809)
1. the 78xx series requires at least 2V to work => i need at least 11 as rectifier output
2.the ac input might vary by 10% ..
peak transformer voltage = 12 * 1.414 = 16.97V
min transformer voltage = 16.97 - 1.697 = 15.27V
vout-bridge = vmin-transformer - (2-0.7) - Vripple
vripple = 15.27 - 1.4 - 11 = 2.87
dt * load current / C = 2.87
C = 8ms * 500mA / 2.87
C = 1393 μf
can someone confirm this is correct ??
thank you for the help !
ankit
I am in the process of making a regulated power supply to convert AC(220V, 60Hz) to DC(9V, 500ma). I have worked out all the calculations and would appreciate if someone could double check just to make sure they are alright.
My setup is as follows
AC(220,60Hz) -> Transformer(12V,500ma) -> Bridge Rectifier -> Voltage Regulator(7809)
1. the 78xx series requires at least 2V to work => i need at least 11 as rectifier output
2.the ac input might vary by 10% ..
peak transformer voltage = 12 * 1.414 = 16.97V
min transformer voltage = 16.97 - 1.697 = 15.27V
vout-bridge = vmin-transformer - (2-0.7) - Vripple
vripple = 15.27 - 1.4 - 11 = 2.87
dt * load current / C = 2.87
C = 8ms * 500mA / 2.87
C = 1393 μf
can someone confirm this is correct ??
thank you for the help !
ankit
