MCP/NAV Board Interface

Inside Glare Box I've put a "MCP/NAV Board Interface" (110x245mm) to connect easily and fastly the hardware as Korry, toggle switch and display to Master Card and Display Card Unit.... a good save time during assembly!

Each Korry 389, toggle switch and encoder can be wiring to terminal block and the display unit by a flat cable. I've report outside the three "decimal dot point" to wire on display PCB (two NAV FREQ and SPEED/MACH) as the display card don't manage this directly. It's preferible wire the GND pin of decimal point to same GND display (multipexed) to use the dimming function of display card, otherwise is possible connect this pin to GND as OUT, cutting the GND wire on display PCB and set a resitor of 330ohm on anode side already present on board (but this will not allow the dimming function..). On board I've also report outside the input for "lights test" easily managed from LEKSEECON.

Other the board interface contain a PWM circuit for backlight regulation of front panel; personally I prefer this method rather voltage regulation.

Anyway in case of my future change, I can switch the source by two jumper and set up another type of circuit to backlight the front panel.