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HOW TO BUILD DAVID EK'S DIGITAL SETTING CIRCLE PROJECT:

THE OTHER DAY A FELLOW ASTRONOMER SAID HE SAW PLANS ON THE WEB ON HOW TO BUILD YOUR OWN DIGITAL SETTING CIRCLES FOR YOUR TELESCOPE.  HE SAID THAT HE HAD LOOKED AT THE SITE FOR SOME TIME BUT THOUGHT THAT IT WAS JUST TOO DIFFICULT TO BUILD.  I FINALLY TOOK A LOOK AT WHAT HE WAS TALKING ABOUT, AND IMMEDIATELY STARTED TO BUILD FROM THE PLANS.  THE PLAN REALLY IS NOT TOO DIFFICULT AND WOULD BE A GOOD FIRST ELECTRONIC CIRCUIT FOR SOMEBODY WHO IS A LITTLE HANDY WITH TOOLS.  AND SINCE ALL DOBS ARE A "KIT" ANYWAY....

I WOULD LIKE TO THANK DAVID EK  FOR HIS GENEROSITY IN PROVIDING THE HOBBY WITH THESE PLANS FREE OF CHARGE!  IF YOU SUCCESSFULLY BUILD THIS PROJECT I THINK YOU OWE HIM AT LEAST A LETTER OF THANKS.  I WILL ASSUME YOU HAVE DOWNLOADED THE FILES FROM DAVID'S SITE, AND THAT YOU HAVE READ HIS DESCRIPTION OF THE CIRCUIT.

I HAVE TO ADVISE YOU WITH THE USUAL DISCLAIMER THAT THE MANY OF THE FOLLOWING TASKS ARE DANGEROUS, AND ONLY YOU ARE RESPONSIBLE IF YOU DAMAGE YOUR SCOPE, COMPUTER, HOUSE, YOURSELF....YOU GET THE PICTURE.  IF YOU NEED HELP ASK!!!

 THE CIRCUIT BOARD:

YOU CAN JUST ORDER THE BOARD ALREADY MADE, BUT THAT WOULD RUIN THE FUN OF A PROJECT LIKE THIS.

 1. YOU NEED TO FIND A LASER PRINTER.  ONLY A LASER PRINTER WILL WORK FOR THIS STEP. 

2.  YOU NEED TO FIND SOME GLOSSY HEAVY STOCK PHOTO PAPER.  I USED JET PRINT PHOTO PAPER BY HAMMERMILL.  I PURCHASED IT AT OFFICE MAX

3.  PRINT THE BRDREV.PDF FILE ON THE GLOSSY SIDE OF THE PAPER.  MAKE SURE THE ACROBAT READER PRINTS IT AT 100%.  TEST IT ON A PLAIN PIECE OF PAPER FIRST.  TEST IT FOR SIZE WITH ONE OF THE IC SOCKETS FROM THE PARTS PILE.  IF THE PINS MATCH THE HOLES, YOU ARE READY TO PRINT.

MAKE SURE IT IS REVERSED!

4.  NEXT, CUT YOUR SINGLE SIDED COPPER PC BOARD.  YOU CAN BUY IT AT RADIO SHACK.  YOU COULD USE DOUBLE SIDED BOARD, BUT WHY SPEND MORE MONEY?  USE A STRAIGHT EDGE.  GIVE YOURSELF ABOUT A HALF  INCH OVER THE SIZE OF THE CIRCUIT SO YOU HAVE SOME ROOM TO MOUNT THE BOARD TO SOMETHING.  USE A SHARP, NEW RAZOR KNIFE ON THE COPPER SIDE OF THE BOARD.  KEEP SCORING UNTIL YOU ARE ALL THE WAY THROUGH.  THE BOARD WILL BE VERY SHARP, USE SOME SANDPAPER TO TAKE THE EDGE OFF.

5.  SCRUB THE BOARD WITH FINE STEEL WOOL UNTIL IT IS NICE AND SHINY.  DO NOT TOUCH THE COPPER SURFACE OF THE BOARD WITH YOUR FINGERS FROM NOW ON!  THIS IS IMPORTANT FOR STEP 7.

6.  NOW CLEAN THE COPPER SIDE OF THE BOARD WITH 99.99% ISOPROPYL ALCOHOL, NOT REGULAR 70% RUBBING ALCOHOL WHICH CONTAINS OILS TO KEEP THE ALCOHOL FROM EVAPORATING.  GET EVERY BIT OF STEEL WOOL OFF OF THE BOARD.  GET EVERY BIT OF YOUR FINGER PRINTS OFF OF THE BOARD.  THIS STEP IS IMPORTANT FOR STEP 7 TO WORK CORRECTLY.

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