DIY Kit DC 3-6V FM Transmitter Module 88-108MHz FM Wireless Microphone

Solder-it-yourself FM audio transmitter for demos, classrooms, and maker projects. Tune anywhere in the 88–108 MHz FM band and receive on a standard FM radio.

⚠️ Compliance note: Operate only where legal. RF power, antenna length, and frequency use are regulated (e.g., FCC/CE). Not for covert recording or unlawful surveillance.

• 🧰 DIY soldering kit — learn RF basics while building

• 🎚️ Adjustable frequency (trimmer capacitor) within 88–108 MHz

• 🔊 Audio input up to −15 dB (mic/line-level with appropriate conditioning)

• 🔌 Low-voltage: DC 3–6 V, ~5–15 mA typical

• 📡 Usable range: ~5–50 m depending on antenna, supply, and environment

• Model: RF-02FM

• Operating Voltage: 3–6 V DC

• Operating Current: ~5–15 mA

• Frequency Range: 88–108 MHz (FM broadcast band)

• Transmission Distance: ~5–50 m (line-of-sight, environment dependent)

• Audio Input (max): −15 dB

• PCB Size: 53 × 40 mm

1. Solder the kit per the silkscreen/bom (observe polarity on electrolytics & transistor pinout).

2. Power with a clean 3–6 V DC source.

3. Attach a short antenna wire to the RF pad (start ~60–75 cm; trim as needed within regulations).

4. Tune a nearby FM radio to ~88–108 MHz; adjust the trimmer capacitor for the clearest signal.

5. Feed audio to the IN/GND pads; start with low level and raise gradually.

Tips: Keep leads short, avoid metal enclosures, and place the antenna away from the PCB for best audio and range.

• 1 × DIY Kit DC 3–6 V FM Transmitter Module (RF-02FM) (unassembled kit)

• 10% OFF for 2 kits • 15% OFF for 3 kits • 20% OFF for 4+ kits (auto-applied)

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