Olive Box Plans Courtesy of Exodus

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

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

_

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

P1

b. Peizoelectric transducer

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

__ /|

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

---- + ----

1714 1500

DSR = Shift Devider Rate ratio = 128

f1 = High Output Frequency = 1714

f2 = Low Output Frequency = 1500