/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/% % / / How to plan, construct, and build a % % / / /// /// /// An Original Box % % / / / / / B By Ripper / / / / / / / O % % / / / / / X Call Hale SD at / / /// /// / / 619/660-6734 % % / /%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/% Well, I know what your thinking. "Exactly, what the hell is a Con Box? Never heard of it." Well, now days, it's very common to have 2 or more phone lines in ones home. This box allows you to connect those 2 lines to give 3 way type service, without having to blow hard stolen cash on a phone that has this simple circutry built in. This is were the name comes from, Con meaning Conference. It is possible to use these boxes in a latter type configuration to hold cons of any size as long as you have the lines for it. What your gonna need: At least 1 phone (2 required for pulse) 2 lines Parts: C1 10-uF, 50 Volt electrolytic Cap. C2 10-uF, 50 Volt electrolytic Cap. C3 10-Uf, 15 Volt tantalum Cap. (No Subsitute for C3!) R1 10K, 1/4 Watt, 10% Comp. Resistor R2 100 ohm, 1/4 Watt, 10% Comp. Resistor (Anything over 10% will reduce performance expotentally!) Q1 2N3904 NPN Silicon Transistor S1 DPST Switch S2 DPST Switch (DPST- Double Pole, Single Throw) T1 Telephone Coupling Transformer Microtran T2110 or equivalent All of this sould be available through your local Radio Shack. Anyway, here's the schematic for the circut: + / . <---------/ -------+---C1---@H ! @H Line 1 S1 PHONE @H - / ! @H <---------/ -------+--------@H T H r H a H n / . H s <-------O-/ ------+----+-C2-@H f ! ! @H o Line 2 ! ! @H r R1 E @H m S2 ! / @H e +--B Q1 @H r .! \ @H C3 C @H T ! ! @H 1 ! R2 @H - / ! ! @H <-------O-/ ------+----+----@H O= Attachment points for second rotory phone or second phone if use with tone. .= Shows the Positive electrode of polorized semidonducters. In this case, mainly the Capactitors. The transformer provides the electrical isolation between the phone lines so they will not interfere with each other. E, B, C, are the Base, Emmiter, and Collecter of Q1. R1, C3, Q1, R2, and C2 all put the electrical signal of a telephone off the hook on line 2 to provide proper operation. If these were not here, the Centeral Office equipment would not sense any electrical changes and would promptly hang up the line. Well, in the interest of quality, I suggest that the circut be constructed on an epoxy/fiberglass PC board, and that all components be properlt soldered using a heatsink, this is Very important for the transistor which is damaged by soldering tempatures in seconds. How to use your box after construction: To start a call: 1. On line one, close the switch, and dial the number just like any other call (950-...Hehe) and wait for the person to answer. 2. Tell him to hang a sec while you call that guy in Michigan. 3. Flip the switch on line 2, you should get a dial tone if you are on the phone oh line 1. Useing tone, dial the number. If you are using pulse, you must use a phone electrically connected to line 2, pick it up, and dial on line 2, and hang it up after the connection is made. 4. To drop someone off the convo, flip the switch of the line he is on. If you are using the phone on line 1, and hit line 1, you will dump yourself.