AC to DC

Discussion in 'FAQs' started by VoidZero, Mar 30, 2002.

  1. VoidZero

    VoidZero New Member

    I have an OLD OLD Lionel train master transformer.
    It puts out about 25 volts AC, the only problem is I have an HO train set and I would like to utilize the transformer for it but it puts out AC and not DC. Does anyone know how I could convert it?

    Thank You.
  2. roryglasgow

    roryglasgow Active Member

    You'd have to find a rectifier or transformer of some kind, but I don't know where to start. But if you have to buy something to convert from AC to DC, why not just go ahead and buy a new DC power pack?

    Check out They sell a wide variety of very good power packs.

  3. VoidZero

    VoidZero New Member

    I would buy a new DC transformer but I have an old Gilbert Smoker that NEEDS 18 Volts DC (trackpower) to work. I have yet to find a CHEAP (or reasonable) HO transformer that is capable of putting out sufficient voltage.
  4. roryglasgow

    roryglasgow Active Member

    But I think that 18 VDC would burn up the motor in any HO-scale model. I think that they are designed for a max of 12 VDC, and that's only for relatively short periods...

    I don't know this for sure, though. I see that Trainworld has HO-scale smoke generators that operate at 16 VDC:

  5. VoidZero

    VoidZero New Member

    Well, I know that it needs about 18 VDC. Because I borrowed a friends G Scale transformer and it ran for a long period of time (and smoked great :) ) on 18VDC.

    Thank You for your input.
  6. TR-Flyer

    TR-Flyer Member

    Dear Voidzero:
    Did you know that ACG made a "rectiformer" to convert one of their AC transformers to DC for use with their DC "S" gauge equipment? Check out the Yahoo groups "S-List" and see if someone there knows about it. There may be info online about how to build one of these things.

  7. billk

    billk Active Member

    If my memory serves (quite often it doesn't anymore) what you need to convert AC to DC is called a bridge (?) rectifier, and you need four diodes to make one.

    It isn't too complicated. If you have a Radio Shack nearby, they should have the parts and plans. (Ask the geek with pimples, not the manager!)
  8. Pitchwife

    Pitchwife Dreamer

    In answer to your question I put together this simple diagram. If I can figure out how to attach it I hope that it helps.

    Attached Files:

  9. 60103

    60103 Pooh Bah

    Radio Shack carries bridge rectifiers already made up -- square lump of plastic with 4 wires coming out but I don't know the ratings. They're usually rated in some totally useless combination of units, say, 200 milliamps at 600 Volts. I bought one but haven't found a use for it yet. At one point there were a number of firms that made rectifier units; I have a H&M one that I use for my Tortoise switch motors.
  10. Pitchwife

    Pitchwife Dreamer

    Another reason that buying the individual parts and a little light soldering can pay off. You know just what you're getting.

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