Crystal Controlled FM Transmitter

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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. 

C9014-NPN-Small-Signal-Transistor

Hardware components 

The following components are required to make Crystal Controlled FM Transmitter Circuit

S.noComponentValueQty
1.TransistorC1975 or 2SC9018, C2581 or C2053, C945 or C90143, 1, 2
2.Antenna1
3.Diode SD101
4.Electret mic1
5.LED1
6.Inductor4 turns, 5 turns1
7.Crystal22~27 MHz1
8.Capacitor47pF , 0.02 uF, 100 uF, 1000 pF, 1uF, 220 pF, 24 pF, 30 pF2, 1, 1, 6, 1, 1, 1, 1
9.Resistor10k, 330 ohm, 100 ohms, 3.9k, 33k, 560 ohms, 47k6, 1, 1, 1, 1, 1, 2
10.Battery9V1

2SC9018 Pinout

2SC9018-Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2SC9018

C9014 Pinout

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.