‰  NOW 25 WPM  ‰  TEXT IS FROM MAY 2019 QST  PAGE 58‰

SYMMETRICAL.  IF YOU HAVE TO FORCE THE PINS INTO THE PC BOARD HOLES, YOU
PROBABLY HAVE IT TURNED 90 DEGREES FROM ITS CORRECT POSITION.  THERE ARE
TWO REASONS FOR THE KITS RELATIVELY HIGH DIFFICULTY RATING.  THE FIRST IS
THE SURFACE MOUNTED AD8307 INTEGRATED CIRCUIT.  IF YOU HAVE NOT WORKED WITH
SURFACE MOUNT DEVICES SMDS, CHECK OUT SOLDERING SURFACE MOUNT DEVICES BY
DINO PAPAS, KL0S, IN THE MARCH 2019 ISSUE OF QST.  THE FIRST STEP IS
LOCATING PIN 1 OF THE AD8307, WHICH IS FOUND FROM A BEVELED EDGE OR DIMPLE
ON THE PACKAGE.  I USED A MAGNIFIER TO FIND THE DIMPLE AND THEN PUT A SMALL
DROP OF WHITE PAINT ON IT.  THE INSTRUCTIONS SUGGEST TINNING AND TACK
SOLDERING PIN 1 OF THE AD8307 TO THE BOARD, THEN CHECKING ALIGNMENT AND
SOLDERING THE REST OF THE PINS.  I FOUND IT EASIER TO TIN ALL EIGHT PADS ON
THE PC BOARD USING A TINY BIT OF SOLDER.  THEN I USED A SMALL PIECE OF
DOUBLE SIDED TAPE ON THE END OF A PENCIL TO HOLD THE SMD IN PLACE.  NEXT,
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ