Monday 30 June 2014

voltage regulator - Transformerless power supply


I'm looking for building a power supply circuit that will convert 230VAC to 5VDC in order to power up an Atmega328P. I also want this to be as small as possible.


I know a transformer is one option but since I want to shrink it I was concerned about using a 5.1V zener diode.


Here is a schematic I found: 5V trasformerless power supply



But how much heat will the the capacitor/diode produce? Is it more efficient to use a transformer instead?




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