This project is designed for educational purposes only. It is meant to show the transmitting principle for a cordless telephone.

It is meant to show the transmitting principle for a cordless telephone. It is also used to tap phones and listen to the conversation of people talking on the phone with out them knowing.

• Resistor 47 Transistor MPSA56

• Resistor 68 PC Board

• Resistor 270 Solder

• A Trimmer cap 5-40F Gray wire

• Capacitor47pF Black wire

• Capacitor 100pF Red wire

• Capacitor 470pF Green wire

• Transistor 2N3904 Enamel wire

• Mount resistors to the PC board,and solder it to the board.

• Mount the following capacitors on the PC board and solder it on.

• Mount the trimmer cap to the PC Board and solder it.

• Then solder the transistor to the board.

• Strip 1/4 of the colored wires and then insert them in to the holes and solder it.

• Scrap off 1/8 Of the enamel and then wind the wire around a pencil or stick. Then solder the wire to the board.

• If it is installed at the point where the telephone line enters the house, then any telephone will activate the telephone bug.

• You cut the green wire on the phone and then connect the green wire on the bug to the disconnected
  incoming green wire.

• Then you connect the gray wire to the other cut green wire. If the connection are correct then it should
  work.

• After installation you turn to the low end or the quietest part of a FM radio and then tune to that channel. To tune you must use a screw driver adjust the Trimmer cap.

• When done then you are ready to be a SPY. The lab takes about 1 to 2 hours.

The Bug didn't work at first but then I made some adjustment to the enamel wire.

This project was pretty fun and if you want to be a FBI agent or CIA agent this you would like this.

Here is a picture of my bug:

This is a block diagram of how the Telephone Bug works. It consists of an audio amplifier, modulator, an RF oscillator and an antenna.

The Telephone Bug can be installed inside the telephone, the line leading to the telephone, or anywhere on the telephone line. Of it is installed at the point were the telephone line enters the house, then any telephone will activate the Telephone Bug.

The active wires of a telephone line are red and green. Check that the polarity of the lines is correct by
measuring the voltage across the red and green line while listening to a dial tone. It should be about 6 volts with the green being positive. Install the unit as shown. You may have to cut the green wire and connect the K-35 green wire to the incoming line and connect the K-35 gray wire to the other cut green wire. If the connection is made properly, the telephone will operate normally.

The most frequently occurring problems result from poor solder connections.

1. Tug slightly on all parts to make sure that they are indeed soldered.

2. All solder connections should be shiny.

3. Solder should flow into a smooth puddle rather than a round ball. Resolder any connections that has
formed into a ball.

4. Have any solder bridges formed? A solder bridge may occur if you accidentally touch an adjacent foil by using too much solder or by dragging the soldering iron across adjacent foils. Break the bridge with your iron.