| 17-JUN-1987 Red box info

  HOW TO BUILD AND USE A RED BOX......
     =<COURTESY OF  -<U.N>->=
     =<TYPED BY THE MASTER >=
      ----------------------

THE RED BOX BASICALLY SIMULATES THE SOUND OF COINS BEING DROPPED INTO THE COIN
SLOT OF A PAY TELEPHONE. A PAY TELEPHONE GENERATES A BURST OF TWO MIXED FREQUENC
IES, 1700 HZ AND 2200 HZ, FOR A SPECIFIC TIME INTERVAL TO DENOTE A NICKLR, DIME,
 OR QUARTER. A NICKLE IS 1700 HZ +2200 HZ FOR 66 MILLISECONDS. A DIME IS 1700 HZ
 + 2200 HZ FOR 66 MILLI. SECS. ON, 66 MS. OFF , THEN 66 MS ON AGAIN. FINALLY, A
QUARTER IS 1700 HZ+2200 HZ FOR 33,MS ON, 33 MS, OFF, CONTINUOSLY REPEATING FOR 5
 TIMES.

    WHEN USING A RED BOX ON A PAY PHONE, FIRST DEPOSIT A REAL NICKLE (BECAUSE T
HEY CAN TELL IF THE FIRST ONE IS A REAL ONE OR JUST A TONE), THEN USE THE TONE B
URST. YOU CAN BUILD THE CIRCUIT TO GENERATE A NICKLE TONE, THEN RECORD IT AND PL
AY IT INTO THE PAY PHONE WITH A WALKMAN CASETTE PLAYER.

     TO GET THE MAP, SEND $2 DOLLARS TO
          MASTER WORLD
          1609 S. BENTLEY AVE
          LOS ANGELES, CALIFORNIA 90025

   THE MAP HAS MANY FIGURES THAT THE COMPUTER CANNOT PRODUCE.


IF YOU HAVE THE MAP , HERE ARE SOME TIPS
   ADJUST R1 TO GET 2200 HZ AT POINT A
   ADJUST R2 "   "  1700 HZ "  "     B
   PRESS SWITCH FOR 66 MS ON AT SPEAKER
   THIS SIMULATES A NICKLE

                                        THE 555 TIMER-> 66MS TIMER
                                 THE 556 DUAL TIMER->2200HZ+1700HZ GENERATOR
                                        741->TIMER OP AMP BUFFER
                                             FOR SPEAKER

 SO REMEMBER IF YOU DON'T HAVE THE MAP SEND TWO DOLLARS TO THE ADDRESS UP
     ABOVE


--- The World of Cryton (UK)
--- +44 4 584 7608