135 lines
6.2 KiB
Plaintext
135 lines
6.2 KiB
Plaintext
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Uploaded By: THE WIZARD OF OZ
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-----------------
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-/SWITCHBOX PLANS/-
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-----------------
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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 line
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physically dead to outside world. This is good, for instance, if you don't want
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to recieve any calls, or if you want to stop someone from talk- ing on that line
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really quickly.
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The circuit 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 don't
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think that should be a problem. I have personally found many uses for the
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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 any way and then turn the switch on.
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If the LED lights up, you connected it right, otherwise reverse the connections.
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Got it? Good, now do the same for line #2, following exactly the same
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procedure.
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Now, let's do an easy one. This will be the line black- out 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 black- out switch connected. Now it really gets
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tough!
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Next on the agenda is the conference switch. I have a few precautions for you
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on this one. First, you have to know what you're doing, and second, it doesn't
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work that well. The 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, it is still good for
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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 hand. It should
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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. Now connect two wires to pins 3 &
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4 and two wires to pins 1 & 2. The wires going to pins one and two are
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connected across the first phone line and the wires from three and four go
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across the second phone line. Test it out: Pick up your phone (either line)
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and wait for dial tone. Then throw on the conference switch. You should get a
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second dial tone. Now dial 555-1212. You should now have two D.A.'s on the
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line, asking each other "What City?". If not, then reverse the connections to
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phone line #1 or #2, it doesn't matter. Now it should work. If not, then
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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 in- dependent
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of each other and each can be built separatly or together.
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Now, refering to the diagram of the DPDT switch above: Connect two wires to
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pins 1 & 2. Then connect these to phone line #1. Now connect two wires to 5 &
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6 and connect these to phone line # 2. Lastly, connect two wires to 3 & 4 and
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con- nect the ends of these to a phone. That's it! Now, pick up the phone and
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you should hear a dial tone. Throw the switch and you should hear another dial
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tone. In some areas you may dial '958' to hear exactly what number you are
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currently connected to, but that should be a problem. If you really can't
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figure it out, then either trace the circut back or call one of the numbers and
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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 site
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of wires all over the place. This also shouldn't be a problem if you know even
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the basics of hardware construction.
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---------------------------------------
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[][][][][][][][][][][][][][][][][][][]
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The Fifth Precinct..[502] 245-8270
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[][][][][][][][][][][][][][][][][][][]
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