I have a power supply which outputs 18v 1.5 amp. For the purpose of my project, I need a 12v 2 amp power supply. I was wondering, if I can make a simple buck converter to convert 18v 1.5amp DC to 12v 2amp DC. Any help is highly appreciated.
I searched Google and could only find 12-5v buck converter examples. I know my circuit will be similar but I am little worried about the values of the components specially the switching transistor (if used) and the capacitors. I am a beginner in DIY electronics. Please help.
In this regard, I must ask that, I had a 230v to 0-12v 2amp step-down transformer. I tried to utilize this transformer to make my 12v 2amp power supply. When I applied a full-wave bridge rectifier to the AC 12v output, my filter capacitor blown away. I tried with 2200uF 25v and 1000uF 50v capacitors. What is going wrong here - is the current too high for the capacitors? Also, if I remove the filter capacitor, the transformer shows 13v 3.5 amp in no-load condition - just attached to an multimeter. Is this expected?