Transformerless 5.3VDC supply

At last some not ordinary transformerless circuit like "1001 variations of cap'n resistor" and quite nice idea to enchance output current employing for this transistor wich can be easily obtained as device with higher power dissipative capabilities than zener diode. I hav noticed also that u use π LC filter. Inductor based filter is surely good choice due to better voltage regulation such as example limit peak voltage charging of second cap. I was design somewhat similiar circuit (precisely an voltage dividing rectifier a oposite to rectiffier-multiplier) and also spend some time on filter sections to deduce what will be best configuration. Finally decide an choke input filter as best in voltage limiting rectifiers. They are surely not in wide use from two main reasons. Too high voltage drop highly dependent on input waveform , and if u use as rectifying elements semiconductor diodes choke input tends to create very high ringing oscillations with diode capacitance and associated with them overvolages that can if no damped destroy diodes. But in such design when voltage drop is highly reccomended and when we use ordinary diodes wich have such high resistance at loads above 100-200 mA that provide required damping without any problems, it is extraordinary well solution. I tweak your design a little and achieve results that could interest you. Means removing one high voltage caps is first advantage. Decrease by half inductance of choke to achieve even more voltage reduction than now is second advantage. In real application this also will be accompanied in reduction of core size reqired cuz by removing first cap we decrease almost twice volt-seconds (time integral of magnetizing voltage also ca webbers) introduced to choke every half cycle and by this saturation of core is much harder to obtain. Lack of constant magnetization from cap wich constantly due to high capacitance introduce DC voltage on choke winding and by this casuse stacking of flux in core whose cannot gets decreased below ( in relative to curvature of hysteresy loop) magnetizing voltage time integral introduced in half-cycle. ...uhhh a lttle complicated when need to explain by words a simple like hell process that differs only by its dynamic nature not static.

Nice , thanks

Very nice