I am looking for a circuit for one of mine typical application. I have transformer power supply with 230VAC/DC input with 12V /1A and 5V/500mA output.
Now I wanted to introduce another stand by power supply from battery which gives 12V supply & acts like standby.
My end device will work on either AC/DC power supply. Can let me know how it can be internally combine to form common source with protection circuit.
I would like to use recommend use of relay so it take care of such issue.