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Wiring a 2 Leg Bi-Polar LED Directly to a Tortoise Without a Resistor

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  • Member since
    September 2004
  • From: Dearborn Station
  • 24,281 posts
Wiring a 2 Leg Bi-Polar LED Directly to a Tortoise Without a Resistor
Posted by richhotrain on Saturday, July 21, 2012 7:09 AM

Can that be done?

If so, which pins on the Tortoise do the two legs connect to?

Rich

Alton Junction

  • Member since
    July 2003
  • From: Sierra Vista, Arizona
  • 13,757 posts
Posted by cacole on Saturday, July 21, 2012 8:11 AM

Just connect it in series in one of the wires between the Tortoise and toggle switch, as shown in diagram 4 of the Tortoise wiring instructions.  If it lights to the wrong color, turn it around.

The LED will be very dim as the Tortoise moves, but will then get brighter when the Tortoise stalls.

  • Member since
    February 2004
  • From: Knoxville, TN
  • 2,055 posts
Posted by farrellaa on Saturday, July 21, 2012 8:23 PM

I posted about this a while back but here is the diagram I used to wire a Bi-Polar LED to the Tortise, in my case as a turnout position indicator located at the turnout.

    -Bob

Life is what happens while you are making other plans!

  • Member since
    September 2004
  • From: Dearborn Station
  • 24,281 posts
Posted by richhotrain on Sunday, July 22, 2012 4:26 AM

Thanks, guys, for the replies.

Bob, does your LED dim while the Tortoise is moving the turnout point rails?  That would seems to be a disadvantage. 

I was thinking of using a resistor and wiring the LED directly to the two outer leads on the Tortoise.

Rich

Alton Junction

  • Member since
    February 2007
  • From: Christiana, TN
  • 2,134 posts
Posted by CSX Robert on Sunday, July 22, 2012 6:58 AM

Yes, when wired to the motor the LED will dim when the motor is moving because it draws less current when moving than it does when stalled .  If you are using the LED as a signal on the layout, then that feature does not look protoypical; however, some people like it because you can see when the turnout has completed it's throw.

  • Member since
    September 2004
  • From: Dearborn Station
  • 24,281 posts
Posted by richhotrain on Sunday, July 22, 2012 8:10 AM

CSX Robert

Yes, when wired to the motor the LED will dim when the motor is moving because it draws less current when moving than it does when stalled .  If you are using the LED as a signal on the layout, then that feature does not look protoypical; however, some people like it because you can see when the turnout has completed it's throw.

I use the LEDs in trackside signals.

Rich

Alton Junction

  • Member since
    February 2004
  • From: Knoxville, TN
  • 2,055 posts
Posted by farrellaa on Sunday, July 22, 2012 9:34 AM

Yes, as has been mentioned already, it does dim while the motor is in motion. Doesn't bother my but in your case it may be an issue.

    -Bob

Life is what happens while you are making other plans!

  • Member since
    September 2004
  • From: Dearborn Station
  • 24,281 posts
Posted by richhotrain on Sunday, July 22, 2012 9:37 AM

farrellaa

Yes, as has been mentioned already, it does dim while the motor is in motion. Doesn't bother my but in your case it may be an issue.

    -Bob

I really do appreciate all of the information.  But, I have decided to go with the resistor setup to avoid the dimming.

Rich

Alton Junction

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