Searchlight Signal Driver Boards (C/MRI)

Post date: Nov 18, 2011 7:14:12 AM

In July a bunch of us assembled a dozen C/MRI Searchlight Signal Driver Boards which are used to convert the two outputs from the computer to display Red, Green, and Yellow.  These will mostly be used with the Sunrise Searchlight signals and some dwarf signals.   This type of signal heads really only have two LEDs, Red and Green.  The yellow is created by mixing the red and green.   This "SSD" board actually oscillates (turns off and on alternately) the Red and Green LEDs to allow for the best yellow hue possible. Each board has circuits for 12 heads.