This is an interesting DIY circuit tutorial, where we are going to demonstrate an FM stereo transmitter in detail. Generally, the FM Stereo transmitter is a low-power FM radio transmitter that broadcasts an electromagnetic signal from an audio gadget. For example, an MP3 player to a standard FM radio. They are commonly utilized in vehicles but may likewise be in fixed areas. For example, communicating from a PC sound card throughout a building.
Accordingly, an amazingly well and completely clear sound FM stereo transmitter circuit for broadcasting CD-quality music on the FM band. This circuit will perform several tasks such as transmitting your Walkman, PC, iPod, Discman, TV, and other audio devices. The circuit likewise utilizes a number of components including BA1404 IC as the main component, along with a few resistors, and capacitors.
Hardware Components
The following components are required to make FM Stereo Transmitter Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | IC | BA1404 | 1 |
| 2. | Antenna | – | 1 |
| 3. | Inductor | 3.5 turns | 1 |
| 4. | Ceramic Capacitor | 1nF, 220pF, 10pF | 6, 1, 5 |
| 5. | Electrolytic Capacitor | 10uF | 4 |
| 6. | Resistor | 47K, 270 ohms, 5.6K, 27K, 150K | 1, 1, 1, 2, 1 |
| 7. | Battery | 1.5V – 3V | 1 |
| 8. | Crystal Oscillator | 38KHz | 1 |
For a detailed description of pinout, dimension features, and specifications download the datasheet of BA1404
FM Stereo Transmitter Circuit
Working Explanation
Accordingly, the core of the FM stereo transmitter circuit is the BA1404 FM transmitter IC. Generally, the circuit requires just scarcely any expensive parts. However, the information voltage ought to be 1.5V to 3V DC. Moreover, it is recommended to not provide more than 3 volts to the circuit it will harm the IC. Moreover, the circuit utilizes a 30cm copper wire as a reception apparatus (antenna). Additionally, the inductor L1 is 3-4 turns of 24-gauge enameled wire likewise twisted on a 5mm ferrite center. Furthermore, the circuit utilizes a variable coil of 3.5 turns demonstrated as follows.
Applications and Uses
- The FM stereo transmitter generally broadcast an electromagnetic signal from a versatile audio device to a standard FM radio
- It is commonly designed from the ground up to give high sound quality, combined with magnificent frequency dependability, unwavering quality, and so on.
- It can likewise be utilized as an independent transmitter to serve a medium-sized town.
- The circuit likewise as an exciter to drive a kilowatt-class power amplifier to serve a huge city.
