--------------------
Olive Box
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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.



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

                    a. Main ringer TTL circuit

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

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

            f       b. Peizoelectric transducer

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

                                                        __  /|
  FROM PIN 2 < - -- --- ---------|(---------.  .-------|  |/ |
                                            >||<       |S1|  |
                                            >||<     --|  |  |
                                            >||<    |  |__|X |
                                G<---------.>||<.---        X|
                                             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:

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


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

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