146 lines
6.4 KiB
Plaintext
146 lines
6.4 KiB
Plaintext
-/SWITCHBOX PLANS/-
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This tutorial is notable in that it is totally and
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absolutely within legal bounds. It's only object is to
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guide you in building a device with which you can control,
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on many different levels, your home phone lines. It is
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designed primarily for two phone numbers, although I
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suspect that provisions for more than two can be easily
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added. With it, you can put one or both phone lines on
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hold with visible indicators of each lines status; conference
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call with two people; change a phone from line #1 to line #2;
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and lastly, make one phone line physically dead to outside
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world. This is good, for instance, if you don't want to
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recieve any calls, or if you want to stop someone from talk-
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ing on that line really quickly.
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The circut is relatively simple to build and I believe
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it is much more economical than buying something like Radio
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Shack's line controller. It will require some knowledge of
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electronics and the phone line in general, but I don't think
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that should be a problem. I have personally found many uses
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for the controller, and have put in into a pleasant "project
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box" so it is not an eyesore.
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OK, now, let's start with the parts list --------
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============================================================
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*** Parts List ***
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1. Two pushbutton (on-off) switches for hold
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2. Two LED's for line status indication
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3. One DPDT switch for conferencing
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4. One SPST switch for line shut off
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5. Another DPDT switch for phone line switching
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6. Get some wire, you'll need it!
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7. 2 modular phone plugs with at least 10 feet of wire each
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8. Two 1.7K ohm resistors
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9. *OPTIONAL* - Project Box
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=============================================================
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*** Construction ***
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We will take the construction of the switchbox-controller
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in parts. First, the hold switches and status indicators. The
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following is a diagram of the essential circut:
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Pushbutton #1 LED
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--------------------------!x!-----0---
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Phone Line #1 1.7K Resistor !
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-----------------/!/!/!/!/------------
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Some word of explanation is in order. First of all, the
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second phone line hold is constructed the same as the first.
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Basically, there are two wires come out of your phone line,
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the red and the green. You have to experiment to find out
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which one is connected to the pushbutton switch and which
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one to the Resistor. To do this, just connect it in any
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way and then turn the switch on. If the LED lights up, you
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connected it right, otherwise reverse the connections.
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Got it? Good, now do the same for line #2, following exactly
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the same procedure.
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Now, let's do an easy one. This will be the line black-
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out switch. First, decide which line you wish to black out.
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Actually, you can do it to both lines if you wish, just get
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an extra SPST switch. Now, connect the switch across the line
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as follows:
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--------------------------------!!!!!!!!
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x ! Hold !
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!x! <---Switch !Circut!
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x ! !
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--------------------------------!!!!!!!!
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Don't worry that your line can't handle both circuts, it can.
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To test out, pick up a phone on the line you have connected
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the switch to and flip it on. There should be dead silence.
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Now, turn it off. You should hear a dial tone. You have to be
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an absolute idiot if this doesn't work.
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OK, let's see what we have so far. If everything is
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working you should now have two hold circuts and a black-
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out switch connected. Now it really gets tough!
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Next on the agenda is the conference switch. I have a
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few precautions for you on this one. First, you have to know
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what you're doing, and second, it doesn't work that well. The
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reason it doesn't is because I am naturally very lazy and
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didn't feel like adding the needed phone transformer. But,
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it is still good for many uses, limited only by your imag-
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ination (to use a cliche').
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First, take the double pole double throw switch into your
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hand. It should look like this on the back:
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---------
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- 1 2 -
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- 3 4 -
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- 5 6 -
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---------
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* Note - Numbers correspond to actual pins.
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Now connect two wires to pins 3 & 4 and two wires to pins
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1 & 2. The wires going to pins one and two are connected
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across the first phone line and the wires from three and
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four go across the second phone line. Test it out: Pick
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up your phone (either line) and wait for dial tone. Then
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throw on the conference switch. You should get a second
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dial tone. Now dial 555-1212. You should now have two
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D.A.'s on the line, asking each other "What City?". If not,
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then reverse the connections to phone line #1 or #2, it
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doesn't matter. Now it should work. If not, then recheck
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EVERYTHING! You messed up!
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Now for the last section - the phone line switcher. With
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this, you can connect a phone directly to the switchbox and
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have it operate from line #1 or line #2, depending on the
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position of the last DPDT switch. Let me emphasize that this
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is optional. Actually, all the circuts are - they are in-
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dependent of each other and each can be built separatly or
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together.
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Now, refering to the diagram of the DPDT switch above:
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Connect two wires to pins 1 & 2. Then connect these to phone
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line #1. Now connect two wires to 5 & 6 and connect these to
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phone line # 2. Lastly, connect two wires to 3 & 4 and con-
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nect the ends of these to a phone. That's it! Now, pick up
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the phone and you should hear a dial tone. Throw the switch
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and you should hear another dial tone. In some areas you may
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dial '958' to hear exactly what number you are currently
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connected to, but that should be a problem. If you really
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can't figure it out, then either trace the circut back or
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call one of the numbers and see if you get a busy signal or
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if it rings.
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Finally - Put the whole mess inside a project case, unless
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you like the site of wires all over the place. This also
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shouldn't be a problem if you know even the basics of
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hardware construction.
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Any questions may be directed to AUTOPSY SAW at Lion's
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Den BBS * (313) 881-2411 *. This file was presented to you
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for the public good. Sit belonely down a tree!
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_____________________________________________________________________________________
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______________________________-END-________________________________________
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o Written by Autopsy Saw
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