1. Full frequency range of 87.5-108MHz, high sensitivity with strong anti-interference capability, stable signal reception
2. AXS2031 chip, 3-5W mono output, low-voltage distortion-free with smooth sound quality
3. 3.3V buck-boost module with 2.5-5.5V wide input voltage, supports either Type-C or battery power
4. Adjustable antenna design enhances signal reception, significantly improving radio sensitivity and stability
5. Clear soldering instructions suitable for DIY enthusiasts, boosting hands-on skills and sense of accomplishment
Main control chip: STC8G1K08 microcontroller; FM receiver module utilizes RDA5807M, covering 87.5~108MHz—essentially global frequency bands—with high sensitivity, low noise, and strong anti-interference capabilities; Amplifier section employs AXS2031 digital amplifier chip (not TDA2822) for simple circuitry, high output power, and distortion-free performance even at 2.5V; The voltage regulation section employs a 3.3V buck-boost module. It maintains a stable 3.3V supply for the microcontroller and LED display even when the input voltage ranges from 2.5V to 5.5V. This contrasts with the AMS1117 regulator chip, where the microcontroller fails to operate normally and the LED display malfunctions when the voltage drops below 3V.
Power Supply: USB-5V (Type C) or 4.5V dry cell battery
Reception Band: FM Band
Frequency Range: 87.5MHz~108MHz
Output Power: Mono 3~5W
Note: Only one power supply method can be used at a time!
30cm Omni-Directional Antenna: We selected a 30cm omnidirectional antenna for signal reception. It can be rotated freely to adjust FM signal reception, significantly enhancing sensitivity for optimal reception.
3.3V Buck-Boost Module: The voltage regulation section employs a 3.3V buck-boost module. It delivers a stable 3.3V output when input voltage ranges from 2.5V to 5V. Even when voltage drops to 2.5V, it still outputs 3.3V, ensuring normal circuit operation. In contrast, the AMS1117 used by other manufacturers is not a boost chip. When voltage falls to 2.5V, the LED display fails to function properly, and the entire circuit operates abnormally.
Distortion-Resistant Amplifier Chip: The amplifier section employs the AXS2031 distortion-resistant digital amplifier chip. Operating within a 2.5–5.5V voltage range, it delivers 3–5W of high-fidelity output at full load with 99% efficiency. It produces smooth, non-harsh sound without distortion even at 2.5V, offering significantly superior audio quality compared to the TDA2822.
Before soldering, cross-reference the component list to ensure no parts are missing. Test transistors, capacitors, resistors, and other critical components with a multimeter for functionality. Prioritize soldering thin surface-mount components and modules first. Use either a soldering iron or a hot air gun with solder paste for rework. Elevate the PCB using a stand, then insert components of similar height according to their pin numbers. To prevent components from falling during flipping, secure them to the PCB edge using adhesive tape. Flip the PCB with component leads facing up. Trim excess lead length with needle-nose pliers, leaving approximately 1mm. Proceed with rapid soldering, following the principle of soldering from shortest to tallest components.
When installing the omnidirectional antenna, position its flat base flush against the soldered PCB back. Secure with M3 screws, adjust vertical alignment, and reinforce with solder joints. Finally, solder the leads to the speaker and battery compartment, then secure them to the PCB with double-sided tape according to their positions. Screw the male and female copper pillars onto the PCB, and conclude by assembling the enclosure.
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1. Customer satisfaction is our top goal. We believe our items are so outstanding. All products are quality checked. They are new and in good condition when shipped to our customers. We are convinced you will be happy with your Purchase.
2. If product is defective or damage upon arrival, or wrong product shipped, please contact us immediately. Returns accepted within 14 days of delivery date and item must be in original new condition, not worn or altered in any way with attached tags & wrap. Otherwise deal is final. Return shipping must be paid by buyer.
3. Please contact us first if you have any problems/questions/concerns. We will be happy to resolve any issues you may have in a cordial and friendly manner.
4. We appreciate your Postive Feedback, and will do the same in return. DO NOT leave negative feedback without first communication
When you satisfied with our product and services please leave us positive feedback.
If a problem occurs, contact us immediately with any email request. Just contact us using the " Ask the seller a question" link on eBay.We will maill bakc within 24hours