Is It Posible To Have Step Up Power Supply Without a Transformer?
Yes technically this is possible ... although I would not recommend bringing this to practice without a firm understanding of the basics!

You say low current, but depending on who you ask this might be different by orders of magnitude. (ECG specialist vs welding engineer. You get the idea.)
Can you elaborate on the current requirement or application?

There are a few variations on this type of circuit, generally called voltage doublers and multipliers. These are sometimes used in electric fly swatters.
Please keep in mind that this is potentially deadly! Dangerous at best.
A battery powered handheld device can only output so much energy at once, a wall plug has a lot more power to deliver!

Things to keep in mind:


Capacitance will dictate max current.
Components have to be rated for the required voltages.
Keep adequate clearance between components to prevent arcing.
230V input is already a bad idea! Maybe experiment with lower voltages first to get a feel for the circuit.