Hi,
is this a job offer? Then decide how much you are willing to pay.
I see you did not spend much time to make clear what you need. Only have a line of text.
Did you review what you have written?
* what is the 12V current?
* what is the input power source?
* what are all the other design specifications and application requirements?
like:
* temperature range
* output stability
* what enclosure
* what safety degree
* what start up behaviour
* expected price for a given volume
* and so on
I recommend to look at a (good) power supply datasheet. Look what items they specify ... and then YOU have to decide to specify the value for your application.
***
You asked for "perfect" feedback. ... but a perfect feedback requires a perfect and complete information/specification/requirement in first place.
****
Generally:
A forum is not meant that others work for you without pay.
A forum is meant that people give help on DETAILED questions. For free. The only thing they "expect" is some motivation in the form of being treated respectfully. Using a "please" a "thank you"... should be the minimum...
"Helping" still means: YOU have to do the main job.
Klaus