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Location: ShenZhen
Ships to: US,
Item: 285734700048
Restocking Fee:No
Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Band:FM
Type:Ham Radio Receiver
Unbranded:Unbranded
Manufacturer Warranty:2 years
☆ Welcome☆ to ☆ my ☆ shop ☆ Description:FM_RADIO_SN is a FM radio receiver board with quiet function, which integrates high sensitivity radio chip, DSP audio signal processing module, audio power amplifier, LCD display and other functional circuits. It is a complete high sensitivity all-digital FM FM radio. Features:1: Use advanced digital audio signal processing technology (DSP) and phase-locked loop (PLL) demodulation technology to make the sound quality more realistic and the performance more stable. 2: The LCD display is intuitive and accurate, with extremely low power consumption and minimal noise interference. 3: Full digital control, easy to operate and make the product more stable and durable. 4: Built-in DSP digital squelch processor, no signal automatic mute, get rid of the irritating rustle of traditional FM radio. 5: 30-level digital volume adjustment range. 6: Support serial communication control, you can use the computer or MCU and other devices with TTL serial port to replace all functions of the key remote control module. 7: Independent Stereo / mono control, with stronger environmental adaptability. 8: The unique quiet signal output terminal can be expanded to control external equipment through the quiet signal. Parameter Minimum value Reference Maximum value unit Working temperature -20 25 +70 ℃ Storage temperature -30 25 +80 ℃ Operating voltage 3.0 5.0 5.5 V IO voltage -0.3 5.5 V RF input voltage 0.3 V Shipping list:1PCS Digital FM Receive Module DSP PLL Wireless Stereo Microphone Circuit Board 76-108MHz LCD Display power supply <1>: FM radio is a radio-sensitive device, and interference from nearby may affect the effect of the receiving station, such as nearby microwave ovens, high-frequency welding, or high-power motors may interfere with the normal operation and reception of the radio effect. <2>: Module power input port (DC3.0-5.0V is marked on the PCB board)-, + connect the negative pole and positive pole of the power supply (battery or regulated power supply) (be sure to check the power supply voltage and polarity before powering on Re-power on error). <3>: The power supply voltage is required to be between 3.0V-5.0V, the maximum current is 2A or above, and the output ripple is small. <4>: It is recommended to use a lithium battery or power frequency transformer after rectification and filtering to obtain a power supply. Do not use switching power supplies without filters, such as mobile phone chargers and power banks. One is that the switching process of this type of power supply will generate a lot of high-frequency interference, which directly affects the reception effect of the radio. The second is the mobile phone charger. The output voltage of the power bank is often 5V higher than the working voltage of the module. Bad module. It is also not recommended to take the USB power supply from the computer, because the power supply current of the computer USB is limited, the working current of the module can reach more than 1A at a large volume, and long-term work will damage or protect the USB power supply of the computer. USB power supply contains all kinds of high-frequency interference generated during the work of the computer, which will affect the effect of radio. Note: The radio (any radio) is a radio-sensitive device, and interference from the power supply or nearby may affect the normal operation of the module. Therefore, it is recommended to use a battery or power frequency transformer to stabilize the voltage obtained by the power supply of the module. Do not use switching power supplies (such as mobile phone chargers, and any other switching power supplies), power banks, switching DC-DC converters, no working Class D amplifiers, microwave ovens, and other devices that generate high-frequency electromagnetic interference. Otherwise, the electromagnetic interference generated by these devices will be spatially coupled to the RF front-end of the module, causing the received signal to generate noise. speaker <1>: It is recommended to choose a pair of 4Ω / 3W or 4Ω / 5W speakers to achieve the best efficiency of the power amplifier output. <2>: SP_L is connected to the left channel speaker, SP_R is connected to the right channel speaker, and SP + / SP- are respectively connected to the positive and negative poles of the corresponding speakers. <3>: If you want to drive the headset, just use the 3.5mm plug of the headset to plug it into the audio socket on the board. After inserting the headset, the power amplifier output will automatically turn off. Antenna <1>: The antenna is mainly responsible for receiving radio waves from space. According to the selection rules of the antenna, the length of the antenna is as close as possible to the 1/4 wavelength of the receiving frequency. For example, to receive a 100MHz radio station, the ideal length of the antenna is L = (wave speed / Frequency) / 4 = 300000000/100000000 = 75cm. <2>: It is recommended to use a whip antenna dedicated for FM radio with a length of 75 cm. Key operation instructions (1): Volume adjustmentV-key: short press volume-, long press continuously-V + key: short press volume +, long press continuous +(2): Frequency adjustmentCH mode: F-key: short press channel-, long press to search upF + key: short press channel +, long press to search for channel down FRE mode: F-key: short press frequency -0.1MHz, long press frequency continuous -1MHzF + key: short press frequency + 0.1MHz, long press frequency continuously + 1MHz(3): mute / playPAUSE key: short press to mute / play, long press to automatically search and save radio stations in full frequency band (CH mode is valid). (4): Automatic squelch threshold (threshold) setting At the same time, long press the F- / F + key for 2 seconds to enter the automatic squelch threshold adjustment interface. The user can adjust the action threshold of the automatic squelch according to the specific use situation. The adjustment range is t00-t20. The easier the signal is to be muted, the smaller the value is, the lower the threshold is, and the weaker the signal is, the easier it is to be muted. Generally, it can be adjusted between t02 and t05. When t = 00, the automatic quiet function is turned off. <5>: Backlight setting Press and hold the PAUSE key in the power off state, then power on and continue to hold the long press, the LCD displays “HI” interface and then displays “B1” to indicate that the backlight has been set to the constant light mode. The display “B0” indicates that the backlight has been set to the power-saving mode, and the backlight automatically turns off after 20 seconds without any key operation in the power-saving mode. After setting, you need to power off and then power on again. Change the setting state and repeat this step to switch (the factory default is B0, which is the backlight power saving mode). <6>: CH / FRE mode switching Simultaneously press and hold the VOL- / VOL + knob for 2 seconds, the LCD displays CH to switch to the search storage mode, and FRE to switch to the manual frequency setting mode. In CH mode, F- / F + key is channel +/- function, and in FRE mode, F + / F- key is frequency +/- function. Description of external terminals <1>: Headphone (audio output) terminal The headphone (audio output) terminal is used to connect headphones or as an audio signal output to connect an external audio power amplifier, using a standard 3.5mm stereo audio socket. When an audio terminal is inserted, the detection foot of the audio base is short-circuited to the ground. After the microcontroller detects the signal, it automatically switches to the audio output mode, that is, the output of the on-board power amplifier is turned off, and the output amplitude of the DAC is adjusted to promote the headset or Standard for driving external amplifiers. <2>: Power amplifier output terminal This module board integrates 3Wx2 power amplifier, which can directly drive two 3W speakersSP_L corresponding port is connected to the left channel speaker, SP_R corresponding port is connected to the right channel speaker, where SP + / SP- are the positive and negative poles of the speaker. <3>: Stereo (stereo) / mono (mono) switch terminal The Stereo / mono terminal is used to set the FM receiving mode of the module. This terminal is suspended for the stereo receiving mode, and this terminal is for the mono receiving mode. Description:The purpose of setting the Stereo / mono switch: Due to the difference in the principle of stereo decoding and mono decoding, the frequency band occupied by the decoded stereo signal is wider, and the signal quality requirements are relatively high. Therefore, when listening to weak stereo broadcasts, the signal-to-noise ratio will be very low, and more bottom noise will be generated. At this time, the circuit can be changed to the mono receiving state to improve the signal-to-noise ratio of the output signal. Although there is no stereo effect in mono mode, the noise is relatively small, but it makes the listening effect better. In other words, this switch is used to improve the signal-to-noise ratio of the radio in the case of weak signals, and it can be switched to mono to make the radio sound clearer in the case of weak signals. Stereo / mono switch to achieve stronger environmental adaptability. <4>: 87.0 / 76.0 (Campus broadcast frequency band setting)The 87.0 / 76.0 terminal is used to set whether the module opens the campus broadcast frequency band mode. If this terminal is floating, the campus broadcast mode is closed (the frequency range is 87.0-108.0MHz). ). <5>: SN_OUT (silent signal output terminal) The purpose of setting this terminal is reserved for possible external applications that need to be triggered by the quiet signal. When the quiet function of the module is turned on, this terminal output will take effect. Output high level during internal quiet operation, and output low level when not operating. Note that the output capacity of this terminal is 3.3V / 20mA. <6>: External antenna terminal The FM_ANT terminal is the antenna signal input terminal of the FM radio, from which the antenna signal is input. It can be connected to an external FM whip antenna via a short wire. <7>: UART terminal The UART terminal is used to connect to the TTL serial port, which can be connected to the module through the serial port of the computer (requires USB to TTL serial line), the TTL serial port of the microcontroller or other controllers, and the functions of the module are controlled by serial commands, which can replace the operation of the keys , Or for remote control (please refer to “Serial Port Operation Manual” for specific serial port control). Shipping list:1pcs Digital FM Receive Module DSP PLL Wireless Stereo Microphone ModuleShipping> We ship to worldwide.> Orders processed within 24-48 hours after payment verification.> We only ship to confirmed Paypal addresses. Your Paypal address MUST MATCH your Shipping address.CountryShipping WayShipping TimeTrackable United StatesUSPS(ePacket)7-18Yes RussiaChina Post15-35Yes Other CountryEconomic Air Mail15-40NoIf you need register mail or other express shipping, Pls contact us. Warranty & Guarantee> Good good quality. Buy with confidence!> Returned & Guarantee. If not satisfied with the item, you can choose to return it for a replacement or money back. We afford all cost if it’s our fault. Exchange or refund.Please contact me before you return it. full refund after we receive our original item.> We maintain high standards of excellence and strive for 100% customer satisfaction! Positive feedback is very important to us. We request that you contact us BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns Contact us> Our goal is customer satisfaction!> Our Working-time From 8:30 AM to 21:30 PM(GMT+08) .> We strive to provide you with the best service, we will reply your question within 24 hours.( IF have any problem, we will appreciate that you contact us first BEFORE open a dispute or request, we will try our best to solve the problem with you. ) Payment> We accept Paypal only, It is fast, easy and safe.> Payment must be completed within 7 days.> PLEASE NOTE: S&H DOES NOT INCLUDE DUTIES, LOCATL TAXES OR ANY OTHER IMPORTATION FEES. About me Please contact me first before you leave a negative review if my item are damaged or defective when you got it, I’ll do resend or refund (as your choice) once I confirm with that, which is a most kind of favourable way to both of us work things out together.Your support and comprehension are highly appreciated for me. Thanks for everything, and at last, I full of expectation to do business with you!!!!
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