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  1. #1
    Full Member level 4
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    Small power supply idea that can derive 5V from 220V

    hi all
    i am designing a fan speed controller using 2051 and single seven segment display . since the circuit needs to be smalll ,i want to cut short the power supply components.i want to make a power supply using resistance and capacitor ,diode. i want to derive 5 volts from 220volts. can anybody please give me the circuit idea for this power supply.

    thanks

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  2. #2
    Advanced Member level 1
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    transformerless power supply microchip




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  3. #3
    Advanced Member level 3
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    transformerless power supply 150ma

    Use 470uf in series with bridge . need more study for you.
    You can go for the battery charger .
    What is your current requirement ?
    Bcoz battery charger is for 100ma – 150ma.
    Charger means mobile charger.



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