Hello,I want to design a circuit like topic title.The amount of current I want to get from the circuit is between 25-30 ma.I will use this current to run the microcontroller and to turn on some LEDs.the voltage range is quite wide, but the amount of current I want to get from the circuit is not that much.The voltage range is quite wide, but the amount of current I want to get from the circuit is not that much.How to design this circuit in a simple and professional way or how can I find a ready-made circuit?