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



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