Transformerless Power Supply

[psdayama]

Very logical design approach... I am planning to use a MKT capacitor rated at 63v (for my circuit) is this the same flavour that is used for the "Mains" transformerless Power supplies?

Also, I have seen a few circuits where the input is passed through the capacitor and then a fullvawe rectifier, what would be the advantage of doing it this way.

Well hopfully, will have something built by the weekend. :-)

Volkov

It is always better to use fullwave rectifier as capacitor may buid up charge
in half wave supplies. 63V MKT capacitors can work with 30V ac source.No need of expensive
X2 capacitors. Only need is to check ampere rating of capacitors.
U have to consider capacitor as lossless impedance and calculate required value as per current requirement. Please note this arrangement works as current source so U have to provide requisite load all time. I am attaching
diagram for same: The unmarked resistor has same value as relay coil.