‰  NOW 40 WPM  ‰  
THEY ARE SLIPPERY AND REQUIRE SOME PATIENCE TO APPLY.  AN ALTERNATIVE IS TO
SIMPLY PRINT SELF STICK LABELS ON YOUR COMPUTER, CUT THEM TO SIZE, AND
APPLY THEM IN FRONT OF THE TUNING AND VOLUME CONTROLS.  NEXT, YOU MAY WANT
TO TEST THE RECEIVER, JUST TO SEE IF IT WORKS.  IT IS EASIER TO FIX ANY
WIRING PROBLEMS NOW, RATHER THAN HAVING TO UNSCREW THE PC BOARD FROM THE
WOOD BASE TO TROUBLESHOOT AND FIX A PROBLEM.  IF YOU RAN AN ENLARGED COPY
OF THE BARE PC BOARD, IT WILL COME IN HA

SAWDUST REGENERATIVE RECEIVER KIT  REVIEWED BY PAUL DANZER, N1II N1II ARRL.
NET IN THE SEPTEMBER 2000 ISSUE OF QST, CHARLES KITCHIN, N1TEV, TOOK THE
CLASSICAL 1930S REGENERATIVE RECEIVER AND UPDATED IT TO SOLID STATE,
RESULTING IN A FULLY FUNCTIONAL BEGINNERS RECEIVER PROJECT.  THE SAWDUST
REGENERATIVE RECEIVER KIT FROM BREADBOARD RADIO IS ONE OF THE MANY SIMILAR
DESIGNS THAT HAVE BEEN OFFERED SINCE THEN, BUT IT IS PERHAPS A LITTLE MORE
COLORFUL.  THE DESIGN IS A BIT DIFFERENT BECAUSE IT DOES NOT HAVE A
REGENERATION CONTROL, BUT IT DOES HAVE A SENSITIVITY POTENTIOMETER AT THE
ANTENNA TERMINALS.  THE SINGLE FIELD EFFECT TRANSISTOR FET PROVIDES A LOCAL
OSCILLATOR AND DETECTOR FUNCTION, FOLLOWED BY AN AUDIO AMPLIFIER.  INSTEAD
OF THE USUAL THREE WINDING AIR CORE COIL FOR ANTENNA COUPLING, TUNING, AND
REGENERATION, THIS UNIT USES FIXED WINDINGS ON A FERRITE TOROID INDUCTOR.
THE RECEIVER CAN BE USED TO TUNE ANY SEGMENT OF APPROXIMATELY 100 KHZ IN
THE RANGE OF 5 TO 8 MHZ.  AS SUPPLIED, IT IS TUNED TO THE 40 METER HAM
BAND, AND RECEIVES AM, CW, AND SSB.  IN ADDITION, IT CAN BE MATED TO A
TRANSMITTER OR USED AS A CODE PRACTICE OSCILLATOR.  PUTTING IT TOGETHER  ON
THE BREADBOARD RADIO WEBSITE, YOU CAN FIND THE INSTRUCTION MANUAL,
ADDITIONAL PICTURES, AND A DEMONSTRATION VIDEO.  IT WOULD BE A GOOD IDEA TO
UNPACK THE PARTS ON A TRAY THAT HAS SIDES, SO THEY DONT ROLL AWAY.  SOME OF

THEM ARE VERY TINY.  DONT DISCARD THE BAGS THE PARTS CAME IN UNTIL YOU
FINISH ASSEMBLY.  EVEN WITH TRANSPARENT PLASTIC BAGS, IT IS VERY EASY TO
OVERLOOK ONE OF THESE PARTS.  I SORTED THE RESISTORS WITH AN OHMMETER, NOT
EVEN TRYING TO SEE THE COLOR CODE ON THE TINY BODIES.  THE CAPACITOR
MARKING VARIED SOME HAD THE ACTUAL VALUE, AND SOME A CODED VALUE.  FOR
EXAMPLE, THE MARKING 101 MEANS THE CAPACITOR IS 100 PF.  MEASURED VALUES
CAN BE WITHIN 20 DONT EXPECT ABSOLUTE VALUES.  THE INSTRUCTIONS INCLUDE A
SEQUENTIAL LISTING OF ALL THE SMALL COMPONENTS.  I LIKE TO HAVE THE PARTS
SORTED BEFORE I BEGIN TO SOLDER, SO I IDENTIFIED EACH PART AND TAPED IT
LIGHTLY NEXT TO ITS LISTING IN THE INSTRUCTIONS.  I ALSO COPIED THE BOARD
ON MY PRINTER/COPIER WITH A MAGNIFICATION OF 3, TO MAKE IT EASIER TO SEE
WHERE EACH PART GOES.  I PAINTED THE WOOD BASE YELLOW, WHICH WAS A GOOD
CHOICE TO DRESS UP THIS KIT.  AFTER APPLYING TWO COATS WITH LIGHT SANDING
IN BETWEEN, I FOLLOWED THE INSTRUCTIONS AND MARKED OUT THE LOCATIONS THAT
CORRESPONDED TO THE MOUNTING POINTS OF THE PC BOARD AND DRILLED A STARTER
HOLE AT EACH MARK.  WHILE THE PAINT DRIES, YOU CAN WIRE THE TOROID.  VERY
‰  END OF 40 WPM TEXT  ‰  QST DE W1AW  ƒ