‰  NOW 25 WPM  ‰  TEXT IS FROM MAY 2015  QST  PAGE 37 ‰

CIRCUIT BOARD VERSION OF THE GENERATOR WITH THE USB SPI MODULE REMOVED AND
THE LCD MODULE MOUNTED. THE LCD FITS INTO SOCKETS ON THE PCB, AND IS
MOUNTED ON HALF INCH STAND OFFS.  THE PCB IS DESIGNED TO MOUNT INSIDE A
HAMMOND 1593X PLASTIC ENCLOSURE.  CONTROL  THE SERIAL PERIPHERAL INTERFACE
CONTROL SIGNALS CAN EITHER BE PROVIDED BY A MICROCHIP USB SPI MODULE OR BY
THE 4D SYSTEMS TOUCHSCREEN LCD MODULE.  AN EXTERNAL COMPUTER CONTROLS THE
GENERATOR VIA A VISUAL BASIC WINDOWS APPLICATION FIGURE 6 IF THE SIGNAL
GENERATOR IS BUILT WITH THE USB SPI MODULE.  SINCE THE USB SPI MODULE IS
SUPPLIED WITH A CONFIGURATION UTILITY AND DYNAMIC LINK LIBRARY DLL, YOU CAN
DEVELOP OTHER CONTROL PROGRAMS TO PROVIDE A MORE SOPHISTICATED CONTROL
SCHEME.  FOR EXAMPLE, THE SIGNAL GENERATOR COULD BE USED AS PART OF AN
AUTOMATED TEST SETUP PERFORMING ADVANCED SWEEPING FUNCTIONS OR REPETITIVE
TESTS.  I PROGRAMMED THE LCD TOUCHSCREEN INTELLIGENT DISPLAY USING THE
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ