Soundtraxx in Athearn Genesis SD 70M

Discussion in 'DCC & Electronics' started by woodone, Nov 19, 2007.

  1. woodone

    woodone Member

    Any one know what voltage the lights are in this beast?:confused:
    The original owner tried to install a DSD-AT100LC Sound Decoder in it, and gave up. The front two lights were burned out. I replaced with some 1.5 volt 30 MA. bulbs. used droping resistor 560 ohm. Lights will not light up- :curse: The original rears will, with the same resistor. Shows to be putting about 2.2 volts to the rear bulbs. They are real bright. So I disconnected them thinking that the voltage was too high. The front lights (1.5 volt) will light with a 330 ohm resistor, but when I read the voltage it was 1.8 to the bulbs. :eek: I need to get a 470 ohm resistor I guess. The local Radio Shack was out of the 470, will try to find some where else. I want the voltage at the bulb to be below 1.5 volts so they will last a day or so.
    Just wondering what the original bulbs were.
    Thanks in advance
  2. woodone

    woodone Member

    Well I did find out what voltage the lights are-- 1.5 volts
    They must be about 15MA because the 1.5 30MA bulbs I used needed differant resistors to keep the volts down.
    Just a note for someone who runs into the same problem.
  3. Harold Cole

    Harold Cole Member

    !000 ohm resistors work perfect,but 560's should work also.Make sure the return is on the neg side of the diode
  4. jbaakko

    jbaakko Active Member

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