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(>                     Olive Box Plans                    <)
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    This is a relatively new box,  and all it basically does
is  serve  as a  phone ringer.    You have  two choices  for
ringers, a piezoelectric transducer (ringer),  or a standard
8 ohm speaker.   The speaker 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 control 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.
 
 
 
             ______________
            |              |        ^
       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
 
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                                   _
FROM PIN 2 < - -- --- ----------| |_| |------------->G
                                    P1
 
                  b. Peizoelectric transducer
 
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                                                      __  /|
FROM PIN 2 < - -- --- ---------|(---------.  .-------|  |/ |
                                          >||<       |S1|  |
                                          >||<     --|  |  |
                                          >||<    |  |__|\ |
                              G<---------.>||<.---        \|
                                           T1
                c. Elctro magnetic transducer
Parts List
----------
 
U1 - Texas Instruments TCM1506
T1 - 4000:8 ohm audio transfomer
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.
 
 
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
                                 ----  + ----
B (                               1714    1500
 
 
              DSR = Shift Devider Rate ratio = 128
     I        f1 = High Output Frequency = 1714
       B_cD02 = Low Output Frequency = 1500