1. Introduction
The DIY NOW HU-017B FM Radio Kit is an upgraded V5.0 version designed for electronics enthusiasts and students to practice soldering and learn about radio technology. This kit features an RDA5807 radio module, offering noise elimination, bass enhancement, high sensitivity, low noise, and strong anti-interference capabilities. It includes a digital tube display for easy viewing of radio channels and signal strength, along with power-off memory and a power-saving mode.
This manual provides detailed instructions for assembling, operating, and maintaining your FM radio kit. Please read it carefully before beginning assembly.
2. Component List
Before starting assembly, please verify that all components listed below are present in your kit. Refer to the image for visual identification.
| Component | Quantity |
|---|---|
| HU-017B circuit board | 1 |
| Digital tube | 1 |
| Horn (Speaker) | 1 |
| TDA2822 (Amplifier Chip) | 1 |
| M2 screw | 1 |
| 16P IC Holder | 1 |
| STC microcontroller | 1 |
| 8P IC Block | 1 |
| Keycaps | 4 |
| Radio antenna | 1 |
| Audio socket (3.5mm) | 1 |
| RDA5807 Module | 1 |
| AMS1117 | 1 |
| Potentiometer 200K | 1 |
| 4P Red and black cable | 1 |
| 104 chip capacitance | 4 |
| 100uF electrolytic capacitor | 4 |
| 1uF electrolytic capacitor | 1 |
| Flip the switch | 1 |
| Red LED | 1 |
| USB socket | 1 |
| 6*6*12.5 keys | 4 |
| In-line resistance 1K | 5 |
| In-line resistance 10K | 1 |
| Power cord | 1 |
| Transparent shell | 1 |
| Battery shrapnel | 1 |
| Self tapping screws | 5 |
3. Assembly Instructions
This is a DIY soldering kit. A certain degree of welding foundation and patience is required. Detailed installation video tutorials are often available from the seller; please refer to those for step-by-step guidance. Welding without error can generally be successful. If welding fails, contact customer service for assistance.
3.1 Circuit Board Assembly
Carefully solder all components onto the HU-017B circuit board according to the provided circuit diagram and component placement guides. Pay close attention to component polarity (e.g., electrolytic capacitors, LEDs) and orientation (e.g., ICs, diodes).
Ensure all solder joints are clean and strong, avoiding short circuits between pads. Insert ICs into their respective holders after all soldering is complete to prevent heat damage.
3.2 Housing Assembly (Optional)
If your kit includes a transparent injection molded case, assemble it around the finished circuit board. The case provides protection and a neat appearance. The kit can be used with or without the housing.
Secure the PCB within the housing using the provided screws. Attach the battery shrapnel if you plan to use battery power. Note that the transparent case may have a normal production trace that does not affect use.
4. Operating Instructions
Once assembled, your FM radio kit is ready for operation. Follow these steps to power on and use your radio.
4.1 Power Supply
The radio can be powered by either 3 AAA batteries (not included) or a USB power supply. Choose one of the two power supply modes; they cannot be used simultaneously.
- USB Power: Connect the provided Android power cord to the USB port on the radio and to a suitable USB power source (e.g., computer, USB wall adapter).
- Battery Power: Insert 3 AAA batteries into the battery compartment within the housing. Ensure correct polarity.
4.2 Basic Operation
Refer to the diagram below for button functions and component identification.
- Power On/Off: Flip the power switch located near the USB port to turn the radio on or off. The digital tube display will light up when powered on.
- Volume Adjustment:
- Short press V+ / V-: Adjusts volume incrementally.
- Long press V+ / V-: Continuously increases or decreases volume.
- Station Tuning:
- Short press F+ / F-: Switches to the next/previous station.
- Long press F+ / F-: Searches for the next/previous station.
- Automatic Search and Storage: The radio features automatic search and storage of stations upon power-on. It can save up to 30 stations.
- Digital Display: The digital tube displays the current radio channel (frequency) and radio signal strength.
4.3 Audio Output
The radio supports connection to headphones or external speakers via the 3.5mm audio jack.
Video Demonstration:
5. Maintenance
To ensure the longevity and optimal performance of your FM Radio Kit, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the radio. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the radio in a dry, dust-free environment when not in use.
- Battery Replacement: If using AAA batteries, replace them when the radio's performance degrades or the display dims.
- Antenna Care: Handle the rod antenna gently to prevent bending or breaking. Extend it fully for best reception.
6. Troubleshooting
If you encounter issues with your FM Radio Kit, refer to the following troubleshooting tips:
- No Power:
- Check if the power switch is in the 'ON' position.
- If using USB power, ensure the cable is securely connected and the power source is active.
- If using batteries, verify they are inserted correctly with the right polarity and are not depleted.
- No Sound:
- Ensure the volume is turned up.
- If using headphones/external speakers, check their connection to the 3.5mm audio jack.
- Verify that the speaker is correctly connected to the circuit board.
- Poor Reception/Static:
- Extend the rod antenna fully and adjust its position for better signal.
- Move the radio to a location with fewer obstructions or electromagnetic interference.
- The number of receiving stations depends on the strength of the peripheral signal.
- Digital Display Not Working:
- Check power supply.
- Ensure the digital tube component is correctly soldered and connected.
- Welding Issues: If the kit does not function after assembly and you suspect welding errors, carefully inspect all solder joints for cold joints, bridges, or incorrect component placement. If you are unable to resolve the issue, contact customer service for further assistance.
7. Specifications
Here are the technical specifications for the HU-017B FM Radio Kit:
| Feature | Detail |
|---|---|
| Product Name | HU-017B upgraded RDA5807 radio production kit |
| Power Supply | 3 AAA batteries or USB power supply (choose one of two) |
| Receiving Radio Frequency | 87-108MHz |
| Maximum Operating Current | Approx. 250mA (when the volume is adjusted to the maximum) |
| PCB Size | 95.5mm x 59mm |
| Dimensions (Assembled with case) | Approx. 103mm (L) x 68mm (W) x 30.5mm (H) (Antenna elongation up to 262mm) |
| Features | RDA5807 module, noise cancellation, bass enhancement, high sensitivity, low noise, strong anti-interference, 15 sound levels, digital tube display, power-off memory, automatic station search/storage (up to 30 stations), power saving mode, adjustable search channel threshold. |
8. User Tips
- Soldering Practice: Take your time with soldering. Double-check component values and polarity before soldering. Good soldering technique is crucial for the kit's functionality.
- Potentiometer Adjustment: Before installing the housing, you can rotate the potentiometer with a screwdriver to fine-tune the sound quality to your preference.
- Signal Strength: For optimal reception, ensure the antenna is fully extended and try to operate the radio away from large metal objects or other electronic devices that might cause interference.
9. Warranty and Support
This product is a DIY kit. Due to the nature of self-assembly and soldering, once welded, returns may be declined. If you encounter any problems during assembly or operation, especially related to welding, please contact the seller's customer service for assistance. They can help you identify the problem and provide guidance.
