I been doing some extensive reading, understanding how the unregulated power supply works and what are its inherent draw backs.

I have come across so many different formulas for determining the capacitor, the bleed resistor, output regulation..etc. Despite that, I have not figured which formula(s) to use.

I dont have a schematic prepared, so for now here is what I have going on paper:

Transformer(13.5 AC)-->rectify_Full Wave-->filter_cap + bleed resistor--->19.5V (no load). For the sake of argument,

**Vripple is 5%, Output Current(max)=3A, RL=6.5Ω, Output Voltage=19.5V**(no load)

Like I said, I have seen tonnes of reading material, but I am not completely sure of the formulas..on the account that every one uses different one..

Can someone please provide me with the basic forumlae to find the filter cap, C. This will help me do an analysis of the output voltage.

Thanks