💾 Archived View for gemini.spam.works › mirrors › textfiles › phreak › BOXES › olive captured on 2022-06-12 at 17:19:35.
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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.
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| | ^
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
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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:
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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