choosing the appropriate transformer

ChrisP58 said:

Nothing energy from the second pulse will be stored, unless it's voltage is greater than the voltage already at the capacitor. So the only way to harvest energy from the second pulse is to either make it larger, or make the cap voltage from the first pulse lower than the second.

You might try using an inductor circuit like a buck converter.

Code:

-------D1----------L1-----------
            |               | 
           D2              C1
            |               |
           gnd             gnd

The cathode of two diodes is connected to the inductor, and should be schottky.

No guarantees, but this might give you some improvement.

Click to expand...

ChrisP58 said:

Research the "buck converter" type of DC to DC converters.

But here are a few places to start with:
http://www.ecircuitcenter.com/Circuits/smps_buck/smps_buck.htm
http://www.smps.us/

Click to expand...

He want this to be SELF POWERED.
No ACTIVE CIRCUITS!

Click to expand...