Re: Wiring Bi-color LED's

Max Maginness

The tortoise motor acts like a resistor in this case with the (bicolor)  LED  in series with it.
The alterative of putting the LED in parallel with the tortoise motor would require a resistor.



From: <> On Behalf Of Tom Anderson
Sent: Saturday, October 13, 2018 1:26 PM
Subject: Re: [w4dccqa] Wiring Bi-color LED's




          Isn’t a resistor needed to knock down the 12 volts given the LED’s show voltage of 2 – 25 V?


          Am I missing something here?








Tom Anderson


Business Information Systems, Inc.

P.O. Box 160396

Boiling Springs, SC  29316


(864) 621-8607


From: <> On Behalf Of Richard Gagnon via Groups.Io
Sent: Saturday, October 13, 2018 4:11 PM
Subject: Re: [w4dccqa] Wiring Bi-color LED's


I put a two lead red/green 3mm, two lead LED in series with one tortoise lead. The tortoise draws almost 20 ma. at stall. Most LED’s are needed. No resistors needed.



On Saturday, October 13, 2018, 11:21 AM, Tom Anderson <tanderson@...> wrote:

I am installing Tortoise machines on my layout and will start a panel using DPDT switches to change the turnout position. I would like to add bi-color led's (red/green) to the panel and power them using the contacts on the Tortoise. Could someone show me a simple way to wire these.

LED's have the following specifications:
Forward voltage (R/G): 2.0/2.2   Max: 2.5/2.6
Reverse voltage: 5.0
Peak forward current: 150mA
Steady Current: 25mA
Given that the Tortoise uses 12V, I am assuming that I need resistors to not damage the LED but I don't know what value or how many are needed.

Any help would be greatly appreciated! I have very little experience doing this.


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