Embedded Freaks..

July 10, 2009

Simple rectifier for MCU PSU

Filed under: embedded-tips — Tags: — kunilkuda @ 11:55 pm

A friend of mine told me about simple rectifier configuration that’s usually deployed in white goods (iron, washing machine, vacuum cleaner, etc). You can view the explanation here and here. It’s very interesting to know that you actually don’t need a big transformer or even switching PSU to supply your MCU from AC source.

Here’s my schematic for my own board:

SimpleRectifierIt will generate 5.1VDC at 21.12mA. Or at least that’s what I hope =)


  1. Wow.. does it rellay work? how about the safety? Have you tried it?

    Comment by Leo — July 22, 2009 @ 5:11 pm

  2. He said if you open the iron, washing machine, or any white goods that need just a small cheap 8-bits MCU, you’ll nearly always find the similar configuration. I’ve soldered it, but not tested it, still waits for the time when the landlady leave the house.

    I don’t want everyone think I’m building a bomb in my room =D

    Comment by kunilkuda — July 22, 2009 @ 10:44 pm

  3. Hey it works..but the output is just 4.7VDC @220VAC.

    Not sure what caused it. No guts to touch the component pins when it runs..=P

    Comment by kunilkuda — July 30, 2009 @ 7:21 pm

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