FM Transmitter Circuit DIY Homemade

FM Transmitter Circuit Diagram DIY
FM Transmitter Circuit Diagram DIY


FM transmitters are used to transmit audio signals wirelessly, allowing users to listen to their favorite radio stations without being limited by cables. Building a homemade FM transmitter circuit using common electronic components is an exciting project that can be easily accomplished. In this article, we will guide you through the process of constructing an FM transmitter circuit DIY using a 2N2222 transistor.

A Personal FM Transmitter, also known as an FM bug or spy transmitter, is a low-power device that allows you to broadcast audio from a portable device, like an MP3 player, to a standard FM radio. It is commonly used in cars and can also be used in fixed locations, such as broadcasting from a computer sound card throughout a building.

FM transmitters operate within the 88MHz to 108MHz range of the FM band. Our circuit design, featuring only one transistor, is considered the best available. It offers a long transmission range, making it ideal for those looking for extended coverage. The circuit can be easily assembled using a PCB layout that can be downloaded and printed on simple paper.

One of the remarkable features of this circuit is its low power consumption. Unlike other designs that drain battery quickly, this circuit consumes only 7 milliamperes of power. It can be powered using a 3V to 9V battery. The transmitter’s range typically reaches approximately 20 to 50 meters. However, with the use of a telescopic antenna, the range can be extended up to 200 meters.

Circuit Diagram of FM Transmitter Circuit DIY

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

FM Transmitter Circuit Diagram
FM Transmitter Circuit Diagram

PCB Layout Top

FM Transmitter Circuit PCB Layout Top
FM Transmitter Circuit PCB Layout Top

PCB Layout Bottom

FM Transmitter Circuit PCB Layout Bottom
FM Transmitter Circuit PCB Layout Bottom

More Circuit Layouts

Components List of FM Transmitter Circuit DIY

Following is the list of all components used in this project:

  • 2N2222 or BC547 Transistor x 1
  • 1nf / 102 Capacitor x 1
  • 22nf Capacitor x 1
  • 10pf Capacitor x 2
  • 1uf Capacitor x 1
  • 330 ohms Resister x 1
  • 47k Resister x 1
  • Condenser Mic x 1
  • Coil 6 to 8 Turn 26AWG 3mm Dia
  • Battery 9v x 1

Explanation of FM Transmitter Circuit DIY

To design an FM transmitter circuit, we will use a 2N2222 NPN transistor as the key component. The circuit operates in the FM radio frequencies range, making it suitable for transmitting audio signals to a radio receiver within a short distance.

Components required:

Complete list of the components used in this project are provided above in the Components List section.

Circuit Design:

Gather all the material required and assemble the circuit as directed by the circuit diagram provided above. If you are assembling it on a PCB board, download the given PCB layouts above.


Once the circuit is assembled, power it up with a 9V battery or power supply. The electret microphone captures the audio signals, which are then converted into radio frequency oscillations by the transistor circuitry. These oscillations are transmitted by the antenna wire as electromagnetic waves in the FM radio frequency range.

Please note that the range of the transmitter will depend on various factors such as antenna length, surrounding interference, and the sensitivity of the receiving equipment.


Building a homemade FM transmitter circuit DIY using a 2N2222 transistor is an engaging project that allows you to transmit audio signals wirelessly. By following the given project details and assembling the circuit carefully, you can create your own FM transmitter and enjoy listening to your favorite tunes without any cables. It is an excellent opportunity to learn about electronics and gain hands-on experience in circuit design and assembly. Have fun experimenting and exploring the world of radio transmission!

More projects, You may like:

For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuitbattery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

FM Transmitter Circuit Diagram using 2N2222 Transistor
FM Transmitter Circuit Diagram

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