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Trouble with Magneto

Discussion in 'General Electronics Discussion' started by Bobo, Aug 7, 2011.

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  1. Bobo


    Aug 7, 2011

    I'm having trouble with a small, hand cranked Magneto I recently purchased. With no load it happily produces 35v ac. I am trying to power a small dc bell which happily runs on a 1.5v battery. When I connect the Magneto via a bridge rectifier (now producing 35v dc nicely without load), the voltage drops to about 0.05v dc.

    Can anyone help with my predicament.

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The magneto can clearly not produce the current required to maintain a voltage across the bell of more than 0.05V.

    You need to turn it faster, or find a lower current bell.

    Note that if the load is being used to regulate the voltage, too small a load will allow the voltage to rise. This may damage the load if it is sensitive to over-voltage.
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