138 lines
3.9 KiB
Plaintext
138 lines
3.9 KiB
Plaintext
|
|
/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%
|
|
% /
|
|
/ How to plan, construct, and build a %
|
|
% /
|
|
/ /// /// /// An Original Box %
|
|
% / / / / / B By Ripper /
|
|
/ / / / / / O %
|
|
% / / / / / X Call Hale SD at /
|
|
/ /// /// / / 619/660-6734 %
|
|
% /
|
|
/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%/%
|
|
|
|
|
|
Well, I know what your thinking.
|
|
"Exactly, what the hell is a Con Box?
|
|
Never heard of it." Well, now days,
|
|
it's very common to have 2 or more phone
|
|
lines in ones home. This box allows you
|
|
to connect those 2 lines to give 3 way
|
|
type service, without having to blow
|
|
hard stolen cash on a phone that has
|
|
this simple circutry built in. This is
|
|
were the name comes from, Con meaning
|
|
Conference. It is possible to use these
|
|
boxes in a latter type configuration to
|
|
hold cons of any size as long as you
|
|
have the lines for it.
|
|
|
|
What your gonna need:
|
|
|
|
At least 1 phone
|
|
|
|
(2 required for pulse)
|
|
|
|
2 lines
|
|
Parts:
|
|
|
|
C1 10-uF, 50 Volt electrolytic Cap.
|
|
C2 10-uF, 50 Volt electrolytic Cap.
|
|
C3 10-Uf, 15 Volt tantalum Cap.
|
|
(No Subsitute for C3!)
|
|
R1 10K, 1/4 Watt, 10% Comp. Resistor
|
|
R2 100 ohm, 1/4 Watt, 10% Comp.
|
|
Resistor
|
|
(Anything over 10% will reduce
|
|
performance expotentally!)
|
|
Q1 2N3904 NPN Silicon Transistor
|
|
S1 DPST Switch
|
|
S2 DPST Switch
|
|
(DPST- Double Pole, Single Throw)
|
|
T1 Telephone Coupling Transformer
|
|
Microtran T2110 or equivalent
|
|
|
|
All of this sould be available through
|
|
your local Radio Shack.
|
|
|
|
Anyway, here's the schematic for the
|
|
circut:
|
|
|
|
+ / .
|
|
<---------/ -------+---C1---@H
|
|
! @H
|
|
Line 1 S1 PHONE @H
|
|
- / ! @H
|
|
<---------/ -------+--------@H T
|
|
H r
|
|
H a
|
|
H n
|
|
/ . H s
|
|
<-------O-/ ------+----+-C2-@H f
|
|
! ! @H o
|
|
Line 2 ! ! @H r
|
|
R1 E @H m
|
|
S2 ! / @H e
|
|
+--B Q1 @H r
|
|
.! \ @H
|
|
C3 C @H T
|
|
! ! @H 1
|
|
! R2 @H
|
|
- / ! ! @H
|
|
<-------O-/ ------+----+----@H
|
|
|
|
O= Attachment points for second rotory
|
|
phone or second phone if use with tone.
|
|
|
|
.= Shows the Positive electrode of
|
|
polorized semidonducters. In this case,
|
|
mainly the Capactitors.
|
|
|
|
The transformer provides the electrical
|
|
isolation between the phone lines so
|
|
they will not interfere with each other.
|
|
|
|
E, B, C, are the Base, Emmiter, and
|
|
Collecter of Q1. R1, C3, Q1, R2, and C2
|
|
all put the electrical signal of a
|
|
telephone off the hook on line 2 to
|
|
provide proper operation. If these were
|
|
not here, the Centeral Office equipment
|
|
would not sense any electrical changes
|
|
and would promptly hang up the line.
|
|
|
|
Well, in the interest of quality, I
|
|
suggest that the circut be constructed
|
|
on an epoxy/fiberglass PC board, and
|
|
that all components be properlt soldered
|
|
using a heatsink, this is Very important
|
|
for the transistor which is damaged by
|
|
soldering tempatures in seconds.
|
|
|
|
How to use your box after construction:
|
|
|
|
To start a call:
|
|
|
|
1. On line one, close the switch, and
|
|
dial the number just like any other call
|
|
(950-...Hehe) and wait for the person to
|
|
answer.
|
|
|
|
2. Tell him to hang a sec while you call
|
|
that guy in Michigan.
|
|
|
|
3. Flip the switch on line 2, you should
|
|
get a dial tone if you are on the phone
|
|
oh line 1. Useing tone, dial the
|
|
number. If you are using pulse, you
|
|
must use a phone electrically connected
|
|
to line 2, pick it up, and dial on line
|
|
2, and hang it up after the connection
|
|
is made.
|
|
|
|
4. To drop someone off the convo, flip
|
|
the switch of the line he is on. If you
|
|
are using the phone on line 1, and hit
|
|
line 1, you will dump yourself.
|
|
|