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power LED on 220v ac or 110v ac (by using rectifier )

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yaghoubi

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hello
I want to make a circuit similar to attached circuit.(30 led 1W in series)
Is the circuit before bridge necessary?and how it could be useful?(how it is works?)

93_1335854736.png
 

This circled with red parts, decrease voltage to lower value, graetz (bridge rectifier) rectify current. 10uF and 100R reduces flicking they sayed that on circuit.
 

u can connect 30 led. i think u hv to replace 100R of the LED side to 50R
 

This circled with red parts, decrease voltage to lower value
Click to expand...

could you please write the formula?(how it can be calculated?)
 

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tpetar is correct, these kind of passive AC-DC converter circuits are only suitable for outputting a few watts at most. At higher currents, the value of the AC line capacitor needs to be excessively large (tens of uF). For 30W, you should really use a proper AC-DC converter, like a SMPS.
 

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