79 lines
2.8 KiB
Plaintext
79 lines
2.8 KiB
Plaintext
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This is a relatively new box, and all it basically does
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is serve as a phone ringer. You have two choices for
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ringers, a piezoelectric transducer (ringer), or a standard
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8 ohm speaker. The speaker has a more pleasant tone to it,
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but either will do fine. This circuit can also be used in
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conjunction with a rust box to control an external something
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or other when the phone rings. Just connect the 8 ohm
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speaker output to the inputs on the rust box, and control
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the pot to tune it to light the light (which can be replaced
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by a relay for external controlling) when the phone rings.
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______________
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NC --|-- 5 4 --|-----/\/\/------->G
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| | / R2
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G<----)|----|-- 6 3 --|-- NC
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| C3 | U1 |
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-------|-- 7 2 --|---------- --- -- - > TO RINGER
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----|-- 8 1 --|--
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| |______________| |
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| ---/\/\/----|(----- L1
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| R1 C1
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------------------------------------------ L2
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a. Main ringer TTL circuit
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(>::::::::::::::::::::::::::::::::::::::::::::::::::::::::<)
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_
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FROM PIN 2 < - -- --- ----------| |_| |------------->G
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P1
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b. Peizoelectric transducer
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(>::::::::::::::::::::::::::::::::::::::::::::::::::::::::<)
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__ /|
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FROM PIN 2 < - -- --- ---------|(---------. .-------| |/ |
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>||< |S1| |
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>||< --| | |
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>||< | |__|\ |
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G<---------.>||<.--- \|
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T1
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c. Elctro magnetic transducer
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Parts List
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----------
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U1 - Texas Instruments TCM1506
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T1 - 4000:8 ohm audio transfomer
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S1 - 8 ohm speaker
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R1 - 2.2k resistor
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R2 - External variable resistor; adjusts timing frequency
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C1 - .47uF capacitor
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C2 - .1uF capacitor
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C3 - 10uF capacitor
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L1 - Tip
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L2 - Ring
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L1 and L2 are the phone line.
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Shift Rate:
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-----------
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This is the formula for determining the shift rate:
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1 1
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SR = --------------------- = ------------ = 6.25 Hz
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(DSR(1/f1)+DSR(1/f2)) 128 128
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---- + ----
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B ( 1714 1500
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DSR = Shift Devider Rate ratio = 128
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I f1 = High Output Frequency = 1714
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B_cD02 = Low Output Frequency = 1500
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