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AC Lighted Volt Meter Help

Discussion in 'LEDs and Optoelectronics' started by rickus, Jan 3, 2012.

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  1. rickus

    rickus

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    Jan 3, 2012
    I have an AC volt meter that includes a small filament to light the display. On the back of the meter are 4 terminals: two for the 120V and two for the filament (3 ~ 6v DC). How do I light the filament along with getting the volt measurement? Sorry if this sounds simplistic (I am a newbie).
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    You can connect a small battery to the terminals for the filament.
     
  3. rickus

    rickus

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    Jan 3, 2012
    can the light just draw power from the 120v line? If so, I imagine we'd need some kind of conversion.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    A small transformer would be the safest. Can you find one with a (say) 4V secondary?

    Maybe you could get a small USB charger and use the 5V from that. Probably cheaper than a transformer.
     
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