FM TRANSMITTER(SPY BUG)

Introduction:

In this Instructables I am going to make an FM Transmitter circuit which can be abused as Spy Bug. FM Transmitter is a device that broadcast music on FM band. In India frequency range of FM band is 88MHz to 108MHz. Making our own FM transmitter is illegal in Most of countries. But the students of Electronics and communications engineering and other radio lovers are permitted to make a very low power FM transmitter circuit and its maximum range must be 50 meters to 100 meters. You are not allowed to transmit signal above this range

Supplies

Electronics Components

• Bipolar Junction Transistor (BJT)

1. 2N2222

• Capacitors

1. 0.01UF(103) - 1
2. 0.01UF104) - 1
3. 4.7PF (4P7) - 1
4. 22PF(220 or 22) - 1

• Copper Wire (diameter - 0.8mm) - 10CM long
• Tuning Capacitor
• LED (Red, 3mm) - 1
• Resistors

1. 10K - 1
2. 1K - 2
3. 47K - 1

• Microphone
• Electret Condenser Microphone (EMY63M) - 1
• Screw Terminal - 1
• Double Side PDB - 1

Step 1: Making the Inductor (Coil)

Inductor (coil) consists of 4 turns

Step 2: Soldering All Components

Step 3: Pictures of PCB

Step 4: Pictures of My Work

Step 5: Circuit Diagram