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Welcome to ETO, surjit!
For your question #1: https://en.wikipedia.org/wiki/Rectifier
and for #2: https://en.wikipedia.org/wiki/DC-to-DC_converter
Nano amps?10 - 100 nA
what is the difference between 1) Step down Transformer + Bridge rectifier and 2) Bridge rectifier + DC - DC converter ??
Thank you . Actually my input is 12 V AC . I want to convert into 3 V DC . may be i should use Rectifier + DC DC converter , since my input is low . am i correct ??
sorry....can you plz explain in detail ? or with a diagram if possible
No, 10 - 100 nA is not enough current to power anything, so anything that requires its own power like a step down is completely out of question.Thank you i will try this circuit , and can i also try Flyback converter to step down DC ??
If I may ask, are you looking for explanations, or are you looking for a solution?
Explanations are readily available by googling.
As per 4pyros (this is simplest):
View attachment 89370
There is a little noise on the output.
No, 10 - 100 nA is not enough current to power anything, so anything that requires its own power like a step down is completely out of question.