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