“FM transmitter circuit projects” are undoubtedly very well known among electronics specialists/students. Be that as it may, the baffling part is most transmitters will not work well, and besides the web is loaded with “crappy transmitter circuits”. In this DIY, we are going to make a project on a “Stable FM transmitter”.
Designing a “stable FM transmitter” circuit is somewhat a difficult task, numerous estimations are included there. There are additionally some development blunders and segment value tolerance. Here you can discover a sensibly “steady and well-tested” transmitter that really works.
Hardware Components
The following components are required to make a Stable FM Transmitter Circuit
| S. No | Component | Value | Qty |
|---|---|---|---|
| 1 | Transistor | 2N3904 | 1 |
| 2 | Zener Diode | 5V | 1 |
| 3 | Electric Mic | – | 1 |
| 4 | Antenna | – | 1 |
| 5 | Inductor | 8 to 10 turns | 1 |
| 6 | Variable Capacitor | 1 – 35pF | 1 |
| 7 | Capacitor | 0.47uF, 10nF, 5pF | 1, 1, 1 |
| 8 | Resistor | 1K, 10K, 5.5K | 2, 1, 1 |
| 9 | Battery | 9 – 12 volts | 1 |
2N3904 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3904
Stable FM Transmitter Circuit
Working Explanation
In this part, we are discussing the operation of the “FM transmitter circuit” which is stable and harmonic-free. There are numerous procedures to produce an FM transmitter stable so it won’t change its frequency as the battery drains. The rf circuit that appeared beneath is a smaller than usual stable FM transmitter that is utilizing a Zener diode to give precise voltage to the oscillator while the battery drains, because of which it won’t float its frequency. The circuit is just utilizing a couple of parts however gives a decent range. The loop L is equivalent to 8 to 10 turns of #22 enameled wire twisted on 6.30 millimeters breadth structure. The input voltage can be 9- or 12-volts DC.
Keep all the parts as close as could reasonably be expected and utilize a 12-inch wire for the antenna or utilize a 30-inch wire antenna for a more prominent range.
Applications and Uses
- It is a steady, and harmonic-free FM transmitter so it is used in a place where we need stable FM broadcast.
