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I aquired three of these Atlas O constant light circuits off da bay. They were from early Atlas O extended vision cabooses. I would like to convert these to LEd operation if possible. IS there a different resister that is needed to do this? I think the bulbs are 1.5 v.

Atlas-Circuit01

The positive leads goto the switch then to the circuit

Atlas-Circuit02Atlas-Circuit03

While the returns goes to the shrinkwrap joint then back out to the common

Atlas-Circuit04

Thanks in advance for your assistance in this matter.

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Images (4)
  • Atlas-Circuit01
  • Atlas-Circuit02
  • Atlas-Circuit03
  • Atlas-Circuit04
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It looks to me like the resistors on the boards are for the IC (voltage regulator?).  I think that is a Zener diode in there as well.  I would be surprised if the output has any current limiting, so put a 470-ohm resistor in between the board and your LEDs and try it.  Depending on how many LEDs you use, you may have to experiment with the resistor value.

I would recommned using 1000-1500 ohm resistor as a start.    Then go higher or lower depending on brightness.    You put the Resistor on one of the wires between the board and LED.    Remember that LED stands for "Light Emitting Diode".    A Diode is polarity sensitive.    It allows voltage/current to flow one way - postive to negative, but not the other.     So if the LED does not light, change the wires to the other LED.  

Another point, if output from board is AC, the polarity will not matter.

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