This Three-Stage FM Transmitter has an RF stage in its yield to balance the amplified signal. By utilizing a reasonable antenna, it can range up to 1 kilometer. The transmitting range is reliant upon various factors, for example, the location of the transmitter, (inside, outside, metal structures), Single wire or dipole reception apparatus, and Power supply voltage.
Moreover, this electronic device is a ground-breaking three-phase, 9V FM transmitter (Tx) with a scope of as much as 1 kilometer in the open. Separation of transmission is subject to the working conditions (in a structure or out in the open), kind of aeronautical utilized (single wire or dipole), working voltage (12V is better than 6V), and if the circuit is crested for maximum performance.
Hardware Components
The following components are required to make FM Transmitter Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | Transistor | 2N3904 | 3 |
| 2. | Antenna | – | 1 |
| 3. | Electric Mic | – | 1 |
| 4. | Inductor | 5 turns | 1 |
| 5. | Variable capacitor | 0 – 10 pF | 1 |
| 6. | Ceramic Capacitor | 820nF, 50µF, 1nF, 33pF, 5.6pF, 8pF, 0.01µF | 2, 1, 1, 1, 1, 1, 1 |
| 7. | Resistor | 1.2K, 32K, 2.2K, 47K, 180Ω, 470Ω | 1, 1, 2, 3, 1, 1 |
| 8. | Battery | 3V | 1 |
2N3904 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3904
FM Transmitter Circuit
Working Explanation
This 3 phase FM transmitter can be used on the off chance that you need a long-range frequency range with less power for instance 1.5V or 3V. The RF intensifier stage is utilized to expand the yield intensity of the transmitter and isolating the radio wire with the oscillator to make the transmitter increasingly steady.
The circuit is comprising of three phases first sound preamplifier stage worked with transistor Q1, second oscillator stage worked with transistor Q2 and the third is RF intensifier stage worked with Q3. The Coil L1 is equal to 5 turns of AWG 22 enameled copper wire rolled on a 3mm structure. For antenna utilize any wire of 75cm length.
Applications and Uses
Three Stage FM Transmitter device is a simple electronic circuit with great sound quality. It is proved to be extraordinary for checking the infant’s room, or different happenings in your home or business. An electret mic is utilized to enhance the affectability.
