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--------- 
OLIVE BOX 
---------



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

This is a relatively new box, and all it basically does is  serve
as a phone ringer. You have two choices for ringers, a piezoelec-
tric transducer (ringer), or a standard 8 ohm speaker. The speak-
er  has a more pleasant tone to it, but either will do fine. This
circuit can also be used in conjunction with a rust box  to  con-
trol  an  external something or other when the phone rings.  Just
connect the 8 ohm speaker output to the inputs on the  rust  box,
and  control  the pot to tune it to light the light (which can be
replaced by a relay for  external  controlling)  when  the  phone
rings.



----- 
Parts 
-----

U1 - Texas Instruments TCM1506
T1 - 4000:8 ohm audio transformer
S1 - 8 ohm speaker
R1 - 2.2k resistor
R2 - External variable resistor; adjusts timing frequency
C1 - .47uF capacitor
C2 - .1uF capacitor
C3 - 10uF capacitor
L1 - Tip
L2 - Ring
     L1 and L2 are the phone line.



------------ 
Construction 
------------

             ______________
            |              |        ^
       NC --|-- 5      4 --|-----/\/\/------->G
            |              |      / R2
G<----)|----|-- 6      3 --|-- NC
    | C3    |      U1      |
     -------|-- 7      2 --|---------- --- -- - > TO RINGER
            |              |
        ----|-- 8      1 --|--
       |    |______________|  |
       |                       ---/\/\/----|(----- L1
       |                           R1      C1
        ------------------------------------------ L2

                  a. Main ringer TTL circuit

(>::::::::::::::::::::::::::::::::::::::::::::::::::::::::<)

                                   _
FROM PIN 2 < - -- --- ----------| |_| |------------->G
                                    P1

                  b. Peizoelectric transducer


(>::::::::::::::::::::::::::::::::::::::::::::::::::::::::<)

                                                      __  /|
FROM PIN 2 < - -- --- ---------|(---------.  .-------|  |/ |
                                          >||<       |S1|  |
                                          >||<     --|  |  |
                                          >||<    |  |__|\ |
                              G<---------.>||<.---        \|
                                           T1
                c. Elctro magnetic transducer



---------- 
Shift Rate 
----------

  This is the formula for determining the shift rate:

                   1                   1
    SR = --------------------- = ------------ = 6.25 Hz
         (DSR(1/f1)+DSR(1/f2))    128     128
                                 ----  + ----
                                 1714    1500


DSR = Shift Divider Rate ratio = 128
 f1 = High Output Frequency = 1714
 f2 = Low Output Frequency = 1500


+++EOF