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cheapest: 5V DC to 5V DC isolated power supply, 200mA?

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BasePointer

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Dear sir,

What is the best and cheapest way to generate isolated 5VDC from a 5VDC?
I need power about 1W.

Thank you.
 

movingbait said:
You didnt specify isolation voltage;
but maybe have a look at
h**p://focus.ti.com/docs/prod/folders/print/dcp010505b.html
h**p://focus.ti.com/docs/prod/folders/print/dch010505s.html

or
www.discovercircuits.com
Click to expand...

Thank you but their cost ($5.35) are problem for me. I mean a simple oscillator, transformer, some diodes and a 7805? Total cost should be around $1, for 60K pieces/year. I need isolation voltage 4000Vrms. I think it is related with transformer.

Added after 3 hours 50 minutes:

Do you think it is impossible?:cry:
 

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