Aideepen | DIY FM Radio Electronic Kit 50-108MHz Adjustable IC RDA5807 with LED Digital Display DIY Soldering Kit 3W Speaker Dual Power

Features:1. Constructed with premium materials, featuring a transparent plastic casing and double-sided epoxy circuit board for simple operation and easy soldering.2. Equipped with a radio module offering noise cancellation, bass enhancement, high sensitivity, low noise, and strong anti-interference capabilities.3. Button-operated controls for channel switching, volume adjustment, clearing all channels, and rescan/preset storage.4. Multiple configurations available: Basic version without digital display, version with digital display, or version with digital display and charging module—select according to needs.5. Wide applicability: Suitable for school teaching, hobby cultivation, scientific research, DIY enthusiasts, etc.Product Specifications:Material: Transparent plastic casing, double-sided epoxy circuit boardName: FM Radio Construction KitControl Chip: RDA5807 8002D (STC81K17 for digital display version)Power Supply: 3 AA batteries or 3.7V lithium battery (not included)Speaker: 1.5-inch 4Ω 3W speaker (40mm outer diameter)Frequency Range: 50-108 MHzSignal-to-Noise Ratio: >60dBSensitivity: Frequency Response: 150Hz-20KHzProduct Dimensions: 1157028mmDifferences:1. Digital Display Version - Bare Components with Housing: Shipped as a set of bare components with housing. Displays radio frequency. Requires 3 AA batteries (not included) for power.2. Basic Version - Bare Components with Housing: One set of loose parts with housing shipped. Does not display radio frequency. Requires 3 AAA batteries (not included).3. Digital Display Version Loose Parts - Housing with Charging Module: One set of loose parts with housing shipped. Includes charging module, charging cable, and lanyard. Can be fitted with a lithium battery. Displays radio frequency. Requires lithium battery or 3 AAA batteries (not included).Instructions for Use1. Power Source: Slide switch up for battery power; slide down for MICRO USB power.2. After powering on, the indicator light illuminates and a static sound is heard. Then extend the antenna to tune stations. [If the indicator light is on but no sound is heard, disconnect power, wait about 30 seconds, then reconnect power.]3. Channel Selection: Press CH+ to select the next channel; press CH- to select the previous channel. [Channel selection simultaneously scans stations; patience is required]4. Volume Adjustment: Press V- to decrease volume, press V+ to increase volume.5. Headphone Usage: Insert headphones into the headphone jack for audio output. [Headphones not included in kit]6. Extend the antenna during station search and operation. Adjust its direction for optimal reception. In areas with dense buildings or remote mountainous regions, fewer stations may be available or none may be found.Soldering Method:1. Solder wire requirements: Diameter 0.8-1mm, melting point around 183°C. Do not use high-melting-point solder.2. Soldering iron requirements: 30-40W3. Maintain soldering tip cleanliness: A layer of black oxide on the tip forms an insulating layer, reducing heating efficiency.4. Soldering procedure as shown below: Most joints require approximately 2-3 seconds to complete.Strictly adhere to soldering requirements:1. Verify component quantity and model numbers. Test measurable components with a multimeter where possible.2. Follow installation steps in the tutorial.3. Install low-profile components before taller ones.4. Solder components in sections as each part is installed, trimming excess leads promptly.5. During soldering, ensure the temperature is not too high and the duration is not too long, as this may damage the circuit board or components.6. After soldering, recheck solder joints for quality and verify correct component placement.7. During power-on testing, ensure the power supply polarity is correct. Voltage must not exceed 3V.8. When securing the enclosure with screws, tighten them firmly but avoid over-tightening.9. If malfunctions occur, first verify the power supply is correct, then inspect component placement and solder joints.Radio Tutorial: http://www.diyleyuan.com/JC/2690.htmlProduct List:1X Radio Kit (DIY components shipped separately; customer soldering required.)