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Uploaded By: THE WIZARD OF OZ
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-/SWITCHBOX PLANS/-
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This tutorial is notable in that it is totally and absolutely within legal
bounds. It's only object is to guide you in building a device with which you
can control, on many different levels, your home phone lines. It is designed
primarily for two phone numbers, although I suspect that provisions for more
than two can be easily added. With it, you can put one or both phone lines on
hold with visible indicators of each lines status; conference call with two
people; change a phone from line #1 to line #2; and lastly, make one phone line
physically dead to outside world. This is good, for instance, if you don't want
to recieve any calls, or if you want to stop someone from talk- ing on that line
really quickly.
The circuit is relatively simple to build and I believe it is much more
economical than buying something like Radio Shack's line controller. It will
require some knowledge of electronics and the phone line in general, but I don't
think that should be a problem. I have personally found many uses for the
controller, and have put in into a pleasant "project box" so it is not an
eyesore.
OK, now, let's start with the parts list --------
============================================================
*** Parts List ***
1. Two pushbutton (on-off) switches for hold
2. Two LED's for line status indication
3. One DPDT switch for conferencing
4. One SPST switch for line shut off
5. Another DPDT switch for phone line switching
6. Get some wire, you'll need it!
7. 2 modular phone plugs with at least 10 feet of wire each
8. Two 1.7K ohm resistors
9. *OPTIONAL* - Project Box
=============================================================
*** Construction ***
We will take the construction of the switchbox-controller in parts. First,
the hold switches and status indicators. The following is a diagram of the
essential circut:
Pushbutton #1 LED
--------------------------!x!-----0---
Phone Line #1 1.7K Resistor !
-----------------/!/!/!/!/------------
Some word of explanation is in order. First of all, the second phone line
hold is constructed the same as the first. Basically, there are two wires come
out of your phone line, the red and the green. You have to experiment to find
out which one is connected to the pushbutton switch and which one to the
Resistor. To do this, just connect it in any way and then turn the switch on.
If the LED lights up, you connected it right, otherwise reverse the connections.
Got it? Good, now do the same for line #2, following exactly the same
procedure.
Now, let's do an easy one. This will be the line black- out switch. First,
decide which line you wish to black out. Actually, you can do it to both lines
if you wish, just get an extra SPST switch. Now, connect the switch across the
line as follows:
--------------------------------!!!!!!!!
x ! Hold !
!x! <---Switch !Circut!
x ! !
--------------------------------!!!!!!!!
Don't worry that your line can't handle both circuts, it can. To test out,
pick up a phone on the line you have connected the switch to and flip it on.
There should be dead silence. Now, turn it off. You should hear a dial tone.
You have to be an absolute idiot if this doesn't work.
OK, let's see what we have so far. If everything is working you should now
have two hold circuts and a black- out switch connected. Now it really gets
tough!
Next on the agenda is the conference switch. I have a few precautions for you
on this one. First, you have to know what you're doing, and second, it doesn't
work that well. The reason it doesn't is because I am naturally very lazy and
didn't feel like adding the needed phone transformer. But, it is still good for
many uses, limited only by your imagination (to use a cliche').
First, take the double pole double throw switch into your hand. It should
look like this on the back:
---------
- 1 2 -
- 3 4 -
- 5 6 -
---------
* Note - Numbers correspond to actual pins. Now connect two wires to pins 3 &
4 and two wires to pins 1 & 2. The wires going to pins one and two are
connected across the first phone line and the wires from three and four go
across the second phone line. Test it out: Pick up your phone (either line)
and wait for dial tone. Then throw on the conference switch. You should get a
second dial tone. Now dial 555-1212. You should now have two D.A.'s on the
line, asking each other "What City?". If not, then reverse the connections to
phone line #1 or #2, it doesn't matter. Now it should work. If not, then
recheck EVERYTHING! You messed up!
Now for the last section - the phone line switcher. With this, you can
connect a phone directly to the switchbox and have it operate from line #1 or
line #2, depending on the position of the last DPDT switch. Let me emphasize
that this is optional. Actually, all the circuts are - they are in- dependent
of each other and each can be built separatly or together.
Now, refering to the diagram of the DPDT switch above: Connect two wires to
pins 1 & 2. Then connect these to phone line #1. Now connect two wires to 5 &
6 and connect these to phone line # 2. Lastly, connect two wires to 3 & 4 and
con- nect the ends of these to a phone. That's it! Now, pick up the phone and
you should hear a dial tone. Throw the switch and you should hear another dial
tone. In some areas you may dial '958' to hear exactly what number you are
currently connected to, but that should be a problem. If you really can't
figure it out, then either trace the circut back or call one of the numbers and
see if you get a busy signal or if it rings.
Finally - Put the whole mess inside a project case, unless you like the site
of wires all over the place. This also shouldn't be a problem if you know even
the basics of hardware construction.
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The Fifth Precinct..[502] 245-8270
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