Generally, crystal-controlled FM transmitters are utilized to generate electromagnetic waves that carry signals to transfer messages Here FM stands for Frequency Modulation, Modulated-carrier with frequency, and constant amplitude. However, crystals Controlled FM transmitter offers a crystal oscillator and frequency multiplier to develop a highly stable carrier signal frequency of 96MHz with 40 mW of RF output.
It likewise works to transmit voice up to a hundred meters. Consequently, the transmitter circuit depends on the induction coil and variable capacitor. Meanwhile, these transmitters are easy to use and low in price. Overall this transmitter covers the most excellent range with less power.
Hardware components
The following components are required to make Crystal Controlled FM Transmitter Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Transistor | C1975 or 2SC9018, C2581 or C2053, C945 or C9014 | 3, 1, 2 |
| 2. | Antenna | – | 1 |
| 3. | Diode | SD10 | 1 |
| 4. | Electret mic | – | 1 |
| 5. | LED | – | 1 |
| 6. | Inductor | 4 turns, 5 turns | 1 |
| 7. | Crystal | 22~27 MHz | 1 |
| 8. | Capacitor | 47pF , 0.02 uF, 100 uF, 1000 pF, 1uF, 220 pF, 24 pF, 30 pF | 2, 1, 1, 6, 1, 1, 1, 1 |
| 9. | Resistor | 10k, 330 ohm, 100 ohms, 3.9k, 33k, 560 ohms, 47k | 6, 1, 1, 1, 1, 1, 2 |
| 10. | Battery | 9V | 1 |
2SC9018 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2SC9018
C9014 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of C9014
Crystal-Controlled FM Transmitter Circuit
Working Explanation
Accordingly, this transmitter operates by using a 1.5-meter wire as antenna 9VD voltage. It likewise utilizes input for maximum output transmitter. It again uses a field strength meter and adjusts coil L1, L2, and L3 by raising and falling gap between coil turns. However, it stops when it is set to its maximum output point.
Applications and Uses
- However, this transmitter circuit utilizes power amplifier stages efficiently to avoid drifting of frequency.
- It uses to provide a better quality of signals for a long.
- There is a use of correctional facilities in the FM transmitters to diminish the prison noise in common areas.
- It covers a large operating area.
