is there a formula to calculate DC output of a transformers AC out after full rectifying and cap smoothing?

 

http://www.hammondmfg.com/pdf/5c007.pdf

 

awesome!! thank you!! what role does the choke play in the
"FULLWAVE BRIDGE Choke Input Load" example?

 

I'd think it helps decreasing ripple current on the output capacitor.

 

The "optimum" choke is calculated to have continuous current through it. If I remember correctly, it decreases the output voltage by 10%. It isn't as simple as calculating an RC circuit. I have never actually used that setup. That's why I can't remember the numbers. Nobody does it that way now because capacitors are so much cheaper than inductors and they don't "cost" any voltage.