75 lines
1.7 KiB
Plaintext
75 lines
1.7 KiB
Plaintext
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PHREAKING TELEPHONE CIRCUITS
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============================
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This is one version of the many Black
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Boxes Available:
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Circuit Diagram
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===============
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-------O------S1------O-------
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: ! ! :
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L ! ! :
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I O------D1------O P
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N ! ! H
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E ! ! O
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: O---D2----R1---O N
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I ! ! E
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N O------C1------O :
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: :
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------------------------------
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List of Bits
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============
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S1 - SPST (Toggle Switch !!)
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D1 - 50-200 volt diode (IN400x range)
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D2 - Standard LED (Red is nice !!)
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R1 - 6.1K Resistor
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C1 - 1uf Non polar capcitor
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Notes
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=====
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(The diodes are positioned as follows)
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D1 ------->!-------
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D2 -------!<-------
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Theory
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======
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When a phone is answered there is normally approx 100MA DC
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loop current but only 80MA or so is necessary to polarise the
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mic element.
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R1 Limits the Loop Current
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C1 Ensures speech is unaffected
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S1 Is used to turn the circiut off/on
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for outgoing calls or for Operator
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Calls etc
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D1 Tells you its working
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Practice
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========
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Leave switch off till you hear it ringing, then switch the
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circuit on.
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Basically it just fools the Telephone system into thinking that
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you have put the phone down. Also if you leave it on all the
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time incoming calls are not charged.
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Snags
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=====
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Have fun,but remember it works for local calls only. Long distance
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calls will be disconnected after 3 mins..
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Cheers <NUT>
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PS. Before I go
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---------------
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Q. What have Flamingo's and BT got in
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common ?
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A. They can both stuff there Bills up
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there Arse !!!!!
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