 
                        How to Construct a Purple Box. 
                        ------------------------------ 
 
                       Written 26 FEB 1986 by The Flash 
 
     The Purple Box is very simple to construct.  It takes only six
components and a PC board if you want.  The Purple Box is a telephone hold
button.  It will allow you to switch phones very easily. 
 
     A red LED indicates when a party is on hold and is automatically 
extinguished when either party releases the line. 
 
     To install your Purple Box, remove the telephone case and locate the red
and green wires.  From the green wire, make a connection to L1 and from the 
red wire a connection to L2. 
 
     To test the circuit, call a friend and then while pressing the push 
button, hang up the phone.  As soon as the phone is on the hook, you may let 
go of the push button. 
 
Parts: 
 
     D1 = Light Emitting Diode (LED) 
     D2 = 1N4003 Diode 
     R1 = 820 ohm 1/2 Watt 
     R2 = 1K ohm  1/2 Watt 
     S1 = N.O. Push Button    S1 
   SCR1 = C106B1          __|__ 
                       +--o   o---+----R1----+ 
                       |         g|          | 
    +--------LED--R2---+-------a--+--c--D2---+ 
    |                                        | 
    |L1                  SCR----/            |L2 
    |                                        | 
  To Green                                To Red 
 
 
   The SCR is a three prong IC.  The a,g, and c tell you what pins to use.
The "g" pin is the one on the left if you look at the numbers. 
 
                                 Have Phun, 
                                 The Flash 
 
 
           Purple Box Created by The Flash '86.  Typed by The Flash. 
 
 
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