In this tutorial, we are demonstrating a project of a “simple FM transmitter” which is easy to make and does not require any expensive components. FM transmitter is a low-power FM radio transmitter that communicates a signal from a sound gadget to a standard FM radio. Ordinarily, we need to make an FM transmitter that is easy to assemble and has a decent range. So here is a basic FM transmitter circuit that contains just a couple of parts and has a long range.
Hardware Components
The following components are required to make FM Transmitter Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Resistor | 5.6K, 10K, 1K | 1, 1, 1 |
| 2. | Capacitor | 0.01µF, 0.33µF, 4.7pF | 1, 1, 1 |
| 3. | Trimmer Capacitor | 1-40 pF | 1 |
| 4. | Antenna | 12 in | 1 |
| 5. | Transistor | 2N3904 | 1 |
| 6. | Mic | – | 1 |
| 7. | Inductor | – | 1 |
2N3904 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3904
FM Transmitter Circuit
Working Explanation
Under this heading, we are discussing the circuit operation of the “Simple FM transmitter”. In this circuit, C3 is a 1 – 40 pf trimmer capacitor, and L1 is 8 to 10 turns of hookup wire of 22 measure twisted on a 6mm structure. The size of a standard pencil is additionally 6mm so you can utilize a round pencil as a structure to wind the curl. The discretional resistor that appeared in this circuit diagram is to limit voice sensitivity. For instance, a 10K resistor will oppose the voice signal originating from the receiver more in contrast with the 1K resistor. On the off chance that you need delicate amplifiers don’t utilize a discretionary resistor. The antenna utilizes a bit of 12-inch hookup wire. Set a clear spot on an FM radio and marginally change the trimmer capacitor with any non-conductive apparatus to tune the transmitter.
Applications and Uses
The FM transmitter is used to play audio gadgets in homes, vehicles, etc.
