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---------- 
Purple Box 
----------



------------ 
Introduction 
------------

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 tele-
phone hold button. It will allow you to switch phones very  easi-
ly.

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.



+++EOF