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alanlai1
Visitor II
October 21, 2003
Question

how can I get 5V DC from 220V AC? without transformrer

  • October 21, 2003
  • 2 replies
  • 663 views
Posted on October 21, 2003 at 09:07

how can I get 5V DC from 220V AC? without transformrer

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    2 replies

    A
    alanlai1Author
    Visitor II
    October 21, 2003
    Posted on October 21, 2003 at 07:09

    I am now doing a project, ( AC power, Thermal Controller )

    Only allow to use mcu + thermal resistor + heater. I feel headache that the voltage supply is AC, how can I get 5V DC from 220V AC? without transformrer.

    Is it possible to use discrete components to do it?

    zener diode? cap? resistor?

    because the project is cost-down approach.
    M
    marco32
    Visitor II
    October 21, 2003
    Posted on October 21, 2003 at 09:07

    Look at Application Note AN392 from ST6

    (Microcontroller and triacs on the 110/240V mains)
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