Simple IRDOT-1 Question

[RR_Mel]

By putting two resistor in series with the cathodes and not using the resistor in series with the anode by putting the green and red together you might come up with a three color signal.  I did that for many years.  The newer three lead LEDs have hot spots of red and green in the yellow.

 

Positive to the anode.

 

 

Mel

 

 

 

My Model Railroad   

http://melvineperry.blogspot.com/

 

Bakersfield, California

 

I'm beginning to realize that aging is not for wimps.

 

 

[wolfman hal]

I am only going to use a 2 color system.  Am  going to able to make it work with the IRDOT-1 in the first post and what would be the connections 1-6

 

Harold

[gregc]

wolfman hal

Am  going to able to make it work with the IRDOT-1 in the first post and what would be the connections 1-6

from https://heathcote-electronics.co.uk/irdot1.html

Wiring

This is as detailed below, but full instructions are supplied with the IRDOT-1.

Terminal 1 Connects to the positive terminal of the power supply

Terminal 2 Electronic switch (open collector transistor) for connection to our other units such as SA8.

Terminal 3 11 volts output used for relays and undetected LEDs

Terminal 4 Not used

Terminal 5 Connects to the long leg of the LED

Terminal 6 Connects to the negative power supply and short leg of LED

 

from above, the IRDOT-1 circuit has a built in resistor for the Red LED.  you would need a direct connection to the anode of the Red LED.

And while a resistor needs to be in series with the Anode of the Green LED, connected to pin 3, you also need direct access to the Green anode to connect to pin 2.

the cathode of both LEDs would be connected to pin 6 which is simply ground.

unfortunately, the wiring shown ties the anodes of both LEDs together and to a common series resistor.   Can't see how the wiring reaches the LEDs. Perhaps you can disconnect it from the LEDs

[wolfman hal]

I was seeing the same thing. I wonder if they tied these internally.  Is anyone reading this post  using a JTD873GR?  If so please join the conversation.

Harold

 

[rrinker]

 Unfortunately they are exactly backwards for what the IRDOT wants. The IRDOT diagram shows the LEDs with both cathodes to pin 6, and the individual anodes to 2 and 5. You need a common cathode signal.

                                        --Randy

 

[wolfman hal]

That is why I asked if anyone is using thr JTD873GR.  I want to know where they are connection the Anodes an if there is a way I can seperate them. The drawing of the wite harness looks like it could be between the LED in the ends of the wires.

Harold