I found this in my led lamp..(Moderator's note: Description of disallowed mains direct to LED / transformerless power supply circuit removed). With this listed components how is it able to achieve an average voltage of around 5v for charging the batteries..#no schematic

 

As you have not traced out the schematic and posted it any answers will only be guessing. My GUESS is that the reactance of the capacitor provides close to a constant current to the bridge rectifier. My GUESS is that the 100 ohm resistor limits the current that would occur if power was applied to the circuit when the input waveform was near it's positive or negative peak. Discussion of this type of power supply is not allowed under the rules of this forum as they are potentially dangerous.

Les.

 

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