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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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