11/29/08

PURPOSE; TO CONTRUCT A PIGGY-BACK CARD FOR THE DM2500D/LCD INTERFACE.

TO THE WB6JHQ REPEATER CONTROLLER.

   1. RADIO SHACK PERF-BOARD PN. 276-158

   2. INSTALL ONE 40 PIN WIREWRAP IC SOCKET AND ONE 14 PIN MALE BERG CONNECTOR TO
	MATE WITH YOUR LCD DISPLAY.


                      TOP VIEW
            __________________________
           |  ____                    |        CUT PINS OF SOCKET TO 1/4":
           | |. 6 |                   |        ----------------------------
           | |  8 |                   |        6821 PINS: 2 THRU 17,19,23
           | |  2 |                   |                     39,40 .  
           | |  1 |                   |
           | |    |                   |
           | |    |                   |
           | |    |                   |
           | |    |                   |
           | |    |   LCD CONNECTOR.  |
           | |____|   14 PIN MALE BERG|
           |  10K  _  |||||||         |
           |  POT.| |.|||||||         |
           |______|O|_________________|

        3. CUT PINS ON SOCKETS PER LIST TO 1/4" LONG.
           LEAVE ENOUGH FOR 1 WIRE
        4. USE A 14 OR 16 PIN FLAT CABLE TO CONN. LCD TO PIGGY-BACK                      
	   BOARD.(DEPENDS ON YOUR LCD CABLE)
        5. SOLDER PIGGY-BACK BOARD ON TOP OF 6821 OF CONTROLLER BOARD.
        6. CONNECT *PIA1 TO 74LS138 PIN 9.
        7. CONNECT SPK_OUT TO MIXER INPUT J8.

	   SOME LCD'S NOW HAVE 16 PIN CABLES. THEY HAVE THE BACKLITE LEDS ON
           PINS 15 AND 16.