DC 2V-12V miniature FM transmitter module with microphone 85MHz –115MHz Single Channel Wireless Microphone Transmit Board 9mA

Product features
1. Excellent quality: This module is the latest micro SMT FM transmitter module, made with good PCB technology. It is compact and easy to fit into thick pen barrels, lighters, etc. The frequency emitted by this module is quite stable and can be received by any radio, especially with digital radios for better results. All components use large brand SMT devices. Please rest assured of the quality, as buyers need to solder the power supply and antenna themselves.
2. Simple principle: The local oscillator circuit of the module adopts the form of a black and white TV high-frequency head, which has a super stable frequency. It is not the kind of ordinary capacitor three-point oscillation circuit that can be compared to. The module adds an amplification and isolation circuit, and the LC filtering circuit and impedance matching circuit effectively filter out the second and third harmonic spectrum. The spectrum is very clean. After testing by myself, this circuit form works up to 200MHz, and even if the antenna of the module is grabbed by hand, there will be no frequency drift. The RF output impedance of the module is 50 ohms, making it convenient for the module to directly match with the power amplifier, which is more suitable for the DIY needs of users!
3. Stable performance: When the power supply voltage of the module is 3V, the transmission distance in open environments is about 100 meters, and in general indoor environments, the distance is about 20 meters. The higher the voltage, the farther the transmission distance. When the voltage is 9V, the transmission distance can reach about 300 meters. The antenna can use a rod antenna, ordinary wire, or thick enameled wire, and the rod antenna and thick enameled wire have better effects. The length of the antenna is about 75 centimeters and must be straightened during use. Of course, shorter antennas can also be used, and the transmission distance will also be shortened. The transmission distance is only for reference and specific recommendations for actual testing.
4. Widely applicable
5. Compact product

Product parameters:
[Working voltage] DC 2V-12V (Type A)
(It is recommended to use a battery for power supply. A stable power supply will produce AC sound, and the frequency of voltage increase will slightly change. However, the long-term operating frequency remains unchanged under the same group of battery power supply.)
[Working current] 9mA (3V voltage test, super power-saving, voltage increase ->current increase ->power increase ->farther distance)
[Emission Distance] In an open area of 100 meters (3V voltage test), the indoor wall penetration distance decreases, and the distance between reinforced concrete walls decreases significantly. Increasing the voltage can greatly increase the distance.
[Operating frequency] 85MHz –115MHz (default factory frequency is generally between 99.0 and 100.9 MHz)
【 Receiving Method 】 Regular FM radio can receive it, and mobile phones with FM function can also receive it. Our store also has two receiving (FM radio) modules. The app radio that uses network data traffic cannot receive it.
【 Frequency Adjustment 】 The miniature adjustable capacitor on the circuit board can be adjusted by turning it with a small screwdriver to adjust the frequency
[Output Impedance] 50 ohms
【 Sensitivity 】 The microphone is placed in a quiet 15 square meter room, and the sound of the quartz clock second hand is clear and audible.
【 Usage 】 High sensitivity wireless microphone, wireless recording, wireless monitoring, remote recording, maternal and child care, patient care, etc. Due to its high sensitivity, it is not suitable for stage performance and is prone to producing whistling sounds.
Do not use for illegal eavesdropping! At your own risk!

Shipping List
1* module