I am trying search something which I can use to convert 220V-DC to about 30-50V DC. I don't want it to be a transformer. I found some voltage regulators providing required output but not having the required input, so all useless, but there may be some available which escaped me.
You can also suggest something, which I can make at home but not too advanced for a Senior High School student. Thanks.
Edit (Thanks to @Transistor, @Asmyldof)
I am trying to make a air cleaner, so trying to power an electric motor having the given range requirement, ie, 30-50V DC.
I am converting the 220v AC mains supply to 220v DC(slightly lower) using 'bridge rectifier', which I had already made and tested.
I will also use 'filter capacitor' in the circuit (parallel) before the regulator.
Best Answer
Producing 220V unregulated DC is actually making life harder for yourself. Buck regulators aren't normally specified to take that high an input voltage.
If you are certain that nobody will be able to touch any live parts, then a simple capacitive dropper circuit may work. But it's difficult to design properly without knowing the current that will be drawn by the motor. If it's too high, then the thing may end up more bulky than just using a transformer.
In particular, you'd need to know the starting current of the motor, which is normally a lot higher than the running current.