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= Autopsy Saw Presents =
= "Building Your Own Switchboard" =
= A short tutorial on controlling your home =
= Phone lines through an easy-to-build device =
= August 26, 1985 =
!=========================================================!
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 circut 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 --------
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*** 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
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*** 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 wofW 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 imag-ination (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| Tsking 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'``Iigure 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.
Any questions may be directed to AUTOPSY SAW at Lion's Den BBS * (313) 881-
2411 *.
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