134 lines
6.5 KiB
Plaintext
134 lines
6.5 KiB
Plaintext
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-/SWITCHBOX PLANS/-
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This tutorial is notable in that it is totally and absolutely within legal
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bounds. It's only object is to guide you in building a device with which you
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can control, on many different levels, your home phone lines. It is designed
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primarily for two phone numbers, although I suspect that provisions for more
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than two can be easily 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 call with two
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people; change a phone from line #1 to line #2; and lastly, make one phone
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line physically dead to outside world. This is good, for instance, if you
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don't want to recieve any calls, or if you want to stop someone from talking
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on that line really quickly.
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The circut is relatively simple to build and I believe it is much more
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economical than buying something like Radio Shack's line controller. It will
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require some knowledge of electronics and the phone line in general, but I
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don't think that should be a problem. I have personally found many uses for
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the controller, and have put in into a pleasant "project box" so it is not an
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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 in parts. First,
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the hold switches and status indicators. The following is a diagram of the
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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 second phone line
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hold is constructed the same as the first. Basically, there are two wires come
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out of your phone line, the red and the green. You have to experiment to find
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out which one is connected to the pushbutton switch and which one to the
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Resistor. To do this, just connect it in anyway and then turn the switch on.
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If the LED lights up, you connected it right, otherwise reverse the
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connections. Got it? Good, now do the same for line #2, following exactly the
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same procedure.
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Now, let's do an easy one. This will be the line blackout switch. First,
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decide which line you wish to black out. Actually, you can do it to both lines
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if you wish, just get an extra SPST switch. Now, connect the switch across the
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line 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. To test out,
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pick up a phone on the line you have connected the switch to and flip it on.
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There should be dead silence. Now, turn it off. You should hear a dial tone.
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You have to be an absolute idiot if this doesn't work.
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OK, let's see what we have so far. If everything is working you should now
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have two hold circuts and a blackout switch connected. Now it really gets tough!
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Next on the agenda is the conference switch. I have a few precautions for
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you on this one. First, you have to know what you're doing, and second, it
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doesn't work that well. The reason it doesn't is because I am naturally very
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lazy and didn't feel like adding the needed phone transformer. But, it is still
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good for many uses, limited only by your imagination (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 1 & 2. The wires
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going to pins one and two are connected across the first phone line and the
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wires from three and 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 throw on the
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conference switch. You should get a second dial tone. Now dial 555-1212. You
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should now have two 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 doesn't matter. Now it
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should work. If not, then recheck EVERYTHING! You messed up!
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Now for the last section - the phone line switcher. With this, you can
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connect a phone directly to the switchbox and have it operate from line #1 or
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line #2, depending on the position of the last DPDT switch. Let me emphasize
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that this is optional. Actually, all the circuts are - they are independent of
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each other and each can be built separately or 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 line #1. Now
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connect two wires to 5 & 6 and connect these to phone line # 2. Lastly,
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connect two wires to 3 & 4 and connect the ends of these to a phone. That's
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it! Now, pick up 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 dial '958' to
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hear exactly what number you are currently connected to, but that should be a
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problem. If you really can't figure it out, then either trace the circut back
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or call one of the numbers and see if you get a busy signal or if it rings.
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Finally - Put the whole mess inside a project case, unless you like the
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site of wires all over the place. This also shouldn't be a problem if you know
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even the basics of hardware construction.
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Any questions may be directed to AUTOPSY SAW at Lion's Den BBS * (xxx) xxx-
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xxxx *. This file was presented to you for the public good. Sit belonely down
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a tree!
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______________________________________________________________________________
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_________________________________-END-________________________________________
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o Written by Autopsy Saw
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