Can any one give some circuit ideas?

[Aswin As]

I thinking of making an led bulb from 230v without a step down transformer.
I think I can use bridge ckt and somthing etc.
can any one help me to build such a ckt that is capable of driving 5 or 7w led's.

 

[tpetar]

Always is good to have isolation. I recommend to use small SMPS psu, you can make it or buy it. In SMD fashion can be very small and compact.

Switched current power supply for 1W - 5W LED diode
http://danyk.cz/izled_en.html

Also see PowerIntegration LinkSwitch-PL family of IC:

http://www.powerint.com/products/linkswitch-family/linkswitch-pl
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For answer on your thread question see these examples:

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Best regards,
Peter