“Ever wondered how come you can just simply tune in to your favorite FM Radio Channel. Moreover, ever had the curiosity of making your own FM Station on a specific frequency? Well if the answer is Yes to any of those questions then you are at the right place!. We are going to look into making small FM Transmitter for Hobby Purposes with a really basic component guide and components that are readily available off the shelf.
The major game here is of the Antenna and the Mic. The Mic converts sound waves into electrical voltage which is filtered via a resistor-capacitor network and amplified using the 2N3904 transistor (or 2N3866/2N4427 for long range). The amplified signal is then transmitted for propagation via the antenna. You might be wondering why there is an inductor near the antenna, this goes into the field of antenna matching circuitry.
- 2N3904 Transistor (or 2N3866/2N4427 for long range)
- Antenna (There are many of the shelf or you can use a simple wire as well of calculated length, 12 Inch)
- Electret Mic
- 9V or 12V DC Supply or Battery
- 1uF Electrolytic Capacitor
- 0.47uF Electrolytic Capacitor
- 1nF Ceramic Capacitor
- 39pF - use 0-30pf Trimmer Capacitor
- 5pF Ceramic Capacitor
- 10k Resistor
- 5.6k Resistor
- 2x 1k Resistors
- 1uH - use 5.5 Turn Coil 5mm Diameter”