The multiple resistors and additional diodes don't make much sense to me. With the NO/NC leads available, one resistor in each leg would provide two different current levels for the two different directions without all the additional parts.
I don't see anything wrong with using the schematic of Original.jpg with R1 and R2 set to higher (and easily different) values to set the appropriate brightness.
Donald.
On 2023-05-15 23:15, miktrain wrote:
Ian,
Size of the diode make no difference, it is just more plastic.
Both resistors are used as they are feeding both LEDs one is red the other is green. Normally changing resistors will change the brightness but as there are two LEDs back to back then the red will change too. I have uploaded a solution for adjusting the brightness, Set your resistors on the board for red brightness with the diodes fitted, then adjust the new resistors for green to suit. These resistors and diodes could go on your board if you want, just make sure they are electrically wired the same.
This works by using your original resistors for both red and green but for green the new ones are added into the circuit. When red the diodes bypass (short out) the new resistors.
Increasing the new resistors will darken the green, increasing the original resistors will darken both red and green.
There are no silly questions, if you are stuck ask away that is what these forums are for.
Tony
http://ozfreemo.com
http://adelaidemodelrailroaders.com
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