Stereo audio signals and microphone input signal into a frequency modulated wave emitted, for FM radio reception, realize the function of wireless transmission stereo audio signals and microphone signals, a pilot system FM stereo transmitter.
Main circuit PLL FM stereo transmitter BH1415F IC , high stability, using STC12C5204AD-35I-SKDIP28 MCU control, digital display frequency, power-down memory frequency, mute function, a stereo / mono conversion, independent audio volume control knob and microphone volume control knob. Button operation, easy to use!
This transmitter board uses BH1415F + MCU + C9018 + C3355 + C2053 circuits, RF output power of about 0.5W, operating voltage 12V, operating current of about 150 mA or so, the DC socket VCC power supply polarity is positive with respect to the core, with power polarity reversal polarity protection.
Module distribution Q9 head 75 cm rod antenna, open area reference launch distance of about 200 meters, the use of outdoor GP antenna reference emission from the open area of about 500-1000 meters. Q9 transmitting antenna can whip antenna or an outdoor GP antenna, can be used to transmit the case of soft wire requirements are not too far from the transmitter.
The radiation plate with stereo audio input jack, audio volume control knob, microphone input jack and microphone volume control knob.
Frequency radiation plate with digital display and four buttons function as follows:
F+: Press the frequency step 0.1MHZ, rapid progressive press and frequency
F-: Click the frequency step back 0.1MHZ, long press fast decreasing frequency
MUTE: Press the mute, the display showed a flash off, again press unmute, display returns to normal
ST / MO: Click to mono mode, the display shows a horizontal line, again press the stereo mode, the display shows two horizontal lines.
1pcs x Stereo FM Transmitter Module
1pcs x 75cm Antenna
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