The Infinity Transmitter courtesy of Exodus


originally typed by:

<<<Ghost Wind>>>

 

FROM THE BOOK BUILD YOUR OWN

LASER, PHASER, ION RAY GUN & OTHER WORKING SPACE-AGE PROJECTS

BY ROBERT IANNINI (TAB BOOKS INC)

 

Description: Briefly, the Infinity Transmitter is a device which activates a

microphone via a phone call. It is plugged into the phone line, and when the

phone rings, it will immediately intercept the ring and broadcast into the

phone any sound that is in the room. This device was originally made by

Information Unlimited, and had a touch tone decoder to prevent all who did not

know the code from being able to use the phone in its normal way. This

version, however, will activate the microphone for anyone who calls while it is

in operation.

NOTE: It is illegal to use this device to try to bug someone. It is also

pretty stupid because they are fairly noticeable.

Parts List:

Pretend that uF means micro Farad, cap= capacitor

 

Part # Description

---- - -----------

R1,4,8 3 390 k 1/4 watt resistor

R2 1 5.6 M 1/4 watt resistor

R3,5,6 3 6.8 k 1/4 watt resistor

R7/S1 1 5 k pot/switch

R9,16 2 100 k 1/4 watt resistor

R10 1 2.2 k 1/4 watt resistor

R13,18 2 1 k 1/4 watt resistor

R14 1 470 ohm 1/4 watt resistor

R15 1 10 k 1/4 watt resistor

R17 1 1 M 1/4 watt resistor

C1 1 .05 uF/25 V disc cap

C2,3,5,6,7 5 1 uF 50 V electrolytic cap or tant

(preferably non-polarized)

C4,11,12 3 .01 uF/50 V disc cap

C8,10 2 100 uF @ 25 V electrolytic cap

C9 1 5 uF @ 150 V electrolytic cap

C13 1 10 uF @ 25 V electrolytic cap

TM1 1 555 timer dip

A1 1 CA3018 amp array in can

Q1,2 2 PN2222 npn sil transistor

Q3 1 D4OD5 npn pwr tab transistor

D1,2 2 50 V 1 amp react. 1N4002

T1 1 1.5 k/500 matching transformer

M1 1 large crystal microphone

J1 1 Phono jack optional for sense output

WR3 (24") #24 red and black hook up wire

WR4 (24") #24 black hook up wire

CL3,4 2 Alligator clips

CL1,2 2 6" battery snap clips

PB1 1 1 3/4x4 1/2x.1 perfboard

CA1 1 5 1/4x3x2 1/8 grey enclosure fab

WR15 (12") #24 buss wire

KN1 1 small plastic knob

BU1 1 small clamp bushing

B1,2 2 9 volt transistor battery or 9V ni-cad

 

Circuit Operation: Not being the most technical guy in the world, and not being

very good at electronics (yet), I'm just repeating what Mr. Iannini's said

about the circuit operation. The Transmitter consists of a high grain

amplifier fed into the telephone lines via transformer. The circuit is

initiated by the action of a voltage transient pulse occurring across the

phone line at the instant the telephone circuit is made (the ring, in other

words). This transient immediately triggers a timer whose output pin 3 goes

positive, turning on transistors Q2 and Q3. Timer TM1 now remains in this

state for a period depending on the values of R17 and C13 (usually about 10

seconds for the values shown). When Q3 is turned on by the timer, a simulated

"off hook" condition is created by the switching action of Q3 connecting the

500 ohm winding of the transformer directly across the phone lines.

Simultaneously, Q2 clamps the ground of A1, amplifier, and Q1, output

transistor, to the negative return of B1,B2, therefore enabling this amplifier

section. Note that B2 is always required by supplying quiescent power to TM1

during normal conditions. System is off/on controlled by S1 (switch).

A crystal mike picks up the sounds that are fed to the first two

transistors of the A1 array connected as an emitter follower driving the

remaining two transistors as cascaded common emitters. Output of the

array now drives Q1 capacitively coupled to the 1500 ohm winding of T1.

R7 controls the pick up sensitivity of the system.

Diode D1 is forward biased at the instant of connection and essentially

applies a negative pulse at pin 2 of TM1, initiating the cycle. D2 clamps

any high positive pulses. C9 dc-isolates and desensitizes the circuit. The

system described should operate when any incoming call is made without ringing

the phone.

 

Schematic Diagram: Because this is text, this doesn't look too hot. Please

use a little imagination! I will hopefully get a graphics drawing of this

out as soon as I can on a Fontrix graffile.

 

To be able to see what everything is, this character: | should appear as a

horizontal bar. I did this on a ][e using a ][e 80 column card, so I'm sorry if

it looks kinda weird to you.

 

Symbols:

resistor: -/\/\/- switch: _/ _

battery: -|!|!- capacitor (electrolytic): -|(-

capacitor (disc): -||- _ _

transistor:(c) > (e) Transformer: )||(

\_/ )||(

|(b) _)||(_

diode: |<

chip: ._____.

!_____! (chips are easy to recognize!)

 

Dots imply a connection between wires. NO DOT, NO CONNECTION.

ie.: _!_ means a connection while _|_ means no connection.

----------------------------------------------------------------------------

 

.________________________to GREEN wire phone line

|

| .______________________to RED wire phone line

| |

| | ._________(M1)______________.

| | | |

| | | R1 |

| | !__________/\/\/____________!

| | | _!_ C1

| | |this wire is the amp ___

| | |<=ground | R2

| | | !___________________/\/\/_____________.

| | | ._______!_______. |

| | !___________________!4 9 11!_____________________________!

| | | | | |

| | !___________________!7 12._____________________________!

| | | | A1 | R3 |

| | !___________________!10 ____*8!_______.____/\/\/____________! ^

| | | | / | | | |

| | | C4 | / | \ |2ma

| | !____||______. | / | /R4 B1 +

| | | || | | / | \ |!|!

| | | R7 | C2 | / | / |

| | !____/\/\/___!__)|__!8*_/ | | S1 |

| | | ^ | 6!_______! neg<__/.__!

| | | | C3 | | | C5 return |

| | | !_____|(___.__!3 | '-|(-| |

| | | | | 5 1!____________! |

| | | \ !_______._______! | B2|!|!

| | !________. R8 / | | +

| | | \ | | R6 |3ma

| | | !__________!____________________|_____/\/\/______! |

| | | R5 | | | v

| | !__/\/\/___________|____________________! |

| | | | |

| | | | |

| | | C6 | |

| | | |-)|-' R9 |

| | | !_________________/\/\/_______. |

| | | | | |

| | | Q1 _!_ | R10 |

| | !____________/ \____________________________!__/\/\/_____!

| | | | |

| | | | |

| | | C8 | |

| | !__________)|_______________________________|____________!

| | ! | |

| | / | |

| | -----| | |

| | | \ | |

| | | > | |

| | | | | |

| | | | | |

| | | !_____________. | |

| | | | | |

| | !__________. | | |

| | | | | |

| !________. | | ._____! |

| | | | | |

| | | | | |

| | | | | C7 |

| | | | '-|(-| |

| |_________|_________!_______.T1._________________| |

| | | 1500 )||( 500 |

| | | ohm )||( ohm |

| | !______.)||(.__. |

| | | | |

| | | | |

| | | > |

| | | |/ |

| | | +----| Q3 |

| | | | |\ |

!____________________|_________|_______|______!__. D1 C9 |

| | | '-|<---|(------| |

.______________! | | | |

| | | | |

| .________________! | | |

| | | | |

\ | .________________! C11 | |

/ | | .___||____________! |

R13 \ | | | || | |

/ | | | | |

\ !___.___|_______________________! | |

| | | | | R16 | R15 |

| v | | !___/\/\/\________!___/\/\/_!

| neg | | | D2 | |

| return | | !_____|<__________! |

| B1,B2 | \ | | |

| | / | .____________!_. |

| | \R14 |C12 | TM1 2 | |

| | / !_||_!5 4!_______!

| | \ | || | | |

| | | !____!1 8!_______!

| | | | | 7 6 3 | |

| | | | !_____._.____._! |

| | | | | | | |

| | | | C13 | | | R17 |

| | | !___)|_____!_!____|__/\/\/__!

| | | | | |

!___________|___!_______________________|_________________! |

| | | |

| \ | C10 |

| /R18 !__________)|_______________!

| \

| /

| |

!___O J1

sense output

 

Construction notes: Because the damned book just gave a picture instead of step

by step instructions, and I'll try to give you as much help as possible. Note

that all the parts that you will be using are clearly labeled in the schematic.

The perfboard, knobs, 'gator clips, etc are optional. I do strongly suggest

that you do use the board!!! It will make wiring the components up much much

easier than if you don't use it.

The knob you can use to control the pot (R7). R7 is used to tune the IT so

that is sounds ok over the phone. (You get to determine what sounds good) By

changing the value of C13, you can change the amount of time that the circuit

will stay open (it cannot detect a hang up, so it works on a timer.) A value of

100 micro Farads will increase the time by about 10 times.

The switch (S1) determines whether or not the unit is operational. Closed is

on. Open is off. The negative return is the negative terminals of the battery!!

The batteries will look something like this when hooked up:

 

<-v_____. .______. ._____. .____->

| | | | | |

__!___!__ | | __!___!__

| + - | !_/ _! | + - |

| | switch ^ | |

| 9volts| | | 9volts|

!_______! neg return !_______!

 

To hook this up to the phone line, there are three ways, depending upon what

type of jack you have. If it is the old type (non modular) then you can just

open up the wall plate and connect the wires from the transmitter directly to

the terminals of the phone.

If you have a modular jack with four prongs, attach the red to the negative

prong (don't ask me which is which! I don't have that type of jack... I've only

seen them in stores), and the green to the positive prong, and plug in. Try not

to shock yourself...

If you have the clip-in type jack, get double male extension cord (one with a

clip on each end), and chop off one clip. Get a sharp knife and splice off the

grey protective material. You should see four wires, including one green and

one red. You attach the appropriate wires from the IT to these two, and plug

the other end into the wall.

 

Getting the IT to work: If you happen to have a problem, you should attempt to

do the following (these are common sense rules!!) Make sure that you have the

polarity of all the capacitors right (if you used polarized capacitors, that

is). Make sure that all the soldering is done well and has not short circuited

something accidently (like if you have a glob touching two wires which should

not be touching.) Check for other short circuits. Check to see if the battery

is in right. Check to make sure the switch is closed.

If it still doesn't work, drop me a line on one of the Maryland or Virginia

BBSs and I'll try to help you out.

 

The sense output: Somehow or other, it is possible to hook something else up to

this and activate it by phone (like an alarm, flashing lights, etc.)

 

As of this writing, I have not tried to make one of these, but I will. If you

actually get it working, leave me a note somewhere.

 

I sure hope all you people appreciate this.