220v ac to 18v ac transformer

Discussion in 'The Projects Forum' started by keithg, Jul 15, 2009.

  1. keithg

    Thread Starter Active Member

    Jan 17, 2009
    40
    0
    I am making a pedal charger for a 12v 3 ah battery using a ceiling fan generator making over 150vac. I assume current would be improved if a transformer limits the voltage? If so, I need a source for a 220vac to 18vac transformer. Mouser does not seem to stock this. Is there a salvageable alternative?
     
  2. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    Sounds like you need a transformer with a step down ratio of 150/18 or about 8. Maybe a 16 VAC doorbell transformer would work (if you live in the US). 24 VAC transformers are fairly common. But you don't give a current rating.

    If you state both the current needed and an allowed voltage range, you might be able to find a member who has such a transformer in their junk box.
     
  3. keithg

    Thread Starter Active Member

    Jan 17, 2009
    40
    0
    Thank you for the advise. I am trying to charge a 12v 3ah motorcycle battery. Max output I believe should be 1 amp dc?
     
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