How much current is the transformerless power supply capable of providing? The LED requires almost 13.6 mA.

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Superman returns..

 

It depends upon the cap the 0.47uF can provide upto 30mA I think.

 

no i did make this kind of circuit before with 0.47µF and it strugles to get 20 mA

Robert-Jan

 

Which value you would have used as series resistor? It matters too.

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Regards,
Sarma.

 

i agree
i used 560hm:
Robert-Jan

 

hi Suraj,

The capacitive reactance of the capacitor is:

Xc = 1/[ 2 * pi * Freq * capacitance] in ohms.

So the current from the mains supply is:
I = Vrms / Xc............the Vrms is the local mains supply voltage.

Its required for safety reasons that a 15R to 47R resistor be connected in series with the capacitor
also a 1M0 connected in parallel with the capacitor.

ALWAYS use a high quality non polarised capacitor, rated for at least, your local mains supply voltage, suitable for continous use for the mains voltage, likewise with the diodes.

REMEMBER: the psu will NOT be isolated from the mains supply, it could deliver a LETHAL electric shock.

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/