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  1. Madrid Boba's Avatar
    Member Since
    Aug 2006
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    Dec 22, 2009, 2:51 PM - Need help from an expert in electronics and electricity #1

    Hello all.

    I need help from someone good with electronics, and electricity. I have a few lifesize characters, Vader and Boba, and both with working devices (chest Box.. belt boxes..etc.).

    The thing is that i would like to connect a single transformer in order to feed two different devices, with different voltage. For example, my Vader has a 3 volt chest box, but 9 volt belt lights. My transformer changes from 220 V to 9 V,..... how can i change the 9 into 3 also? ( i dont want to use more than one transformer for each character...)


    So it should go... 220 ----] 9-------- ] 3


    Thanks



    Alfredo
    Last edited by Madrid Boba; Dec 22, 2009 at 3:35 PM.
  2. Madrid Boba's Avatar
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    Dec 22, 2009, 3:47 PM - Re: Need help from an expert in electronics and electricity #2

    I think that i made a mistake, this should be in the prop building workshop... i dont know how it ended up here... sorry. Please admin move it to the right place.

    thanks

    Alfredo
  3. Astro Builder's Avatar
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    Dec 22, 2009, 9:20 PM - Re: Need help from an expert in electronics and electricity #3

    Going from 220 to 9V is definitely a transformer requirement. No to mention, I am assuming that you are converting AC to DC in the process. Going from 9VDC to 3VDC is no big deal. That can be handled through a very small circuit board. If you were in the US I would suggest checking with Radio Shack, but I am sure you can find a solution on the web. Also, many DC items have an operating range. IN other words it may operate on anything between 6-12V, but it depends on the circuit. You may also need to know the current, but probably for the size application you are talking about, it will be insignificant.

    Here is a link to a simple circuit that can be built to do what you are looking for.

    http://www.elecfree.com/electronic/9...ter-by-lt1073/

    You find pre-made circuits, but you can build this for next to nothing.
  4. Madrid Boba's Avatar
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    Dec 23, 2009, 5:08 PM - Re: Need help from an expert in electronics and electricity #4

    Thanks Astro Builder for your help. I do have a transformae that can change 220v to 3, 4.5, 6 , 9 or 12 volts. But if i use it with 9 volts, then i can not feed with the same one the 3 volt item. So i guess that what i need is something between the 9 volts and the device, to reduce the voltage to 3.....

    Thanks

    Alfredo
  5. mrmandalore's Avatar
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    Dec 23, 2009, 5:49 PM - Re: Need help from an expert in electronics and electricity #5

    If you use a parallel circuit, with both loops at 9V, you can put a resistance into one loop at twice the resistance of the 3V load - that way the load would only receive 3V, while the other loop would get 9V.

    Simples ......
  6. Astro Builder's Avatar
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    Dec 24, 2009, 8:58 AM - Re: Need help from an expert in electronics and electricity #6

    Quote Madrid Boba said: View Post
    Thanks Astro Builder for your help. I do have a transformae that can change 220v to 3, 4.5, 6 , 9 or 12 volts. But if i use it with 9 volts, then i can not feed with the same one the 3 volt item. So i guess that what i need is something between the 9 volts and the device, to reduce the voltage to 3.....

    Thanks

    Alfredo
    The circuit I provided would take the 9V feed and convert to 3V, so you would have both. Use the transformer to convert to 9VDC and then takes a parallel feed off the 9VDC output to power the circuit which will give you an output of 3VDC.
    Last edited by Astro Builder; Dec 25, 2009 at 3:54 PM.
  7. Madrid Boba's Avatar
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    Dec 24, 2009, 1:10 PM - Re: Need help from an expert in electronics and electricity #7

    Thanks again !!!

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