Bluetooth 5.0 Mini Stereo Amplifier Board – 5W×2 Audio Module
Bluetooth 5.0 Mini Stereo Amplifier Board – 5W×2 Audio Module
Bluetooth 5.0 Mini Stereo Power Amplifier Board – 5W×2 Audio Decoder Module
Build your own wireless speaker system with this compact Bluetooth 5.0 stereo amplifier board. Delivering up to 10W total output (5W × 2 channels), this mini PCB module is ideal for DIY audio projects, speaker builds, and portable sound system modifications. Pair it effortlessly with any Bluetooth-enabled smartphone or device and enjoy clean, stable stereo audio output.
Key Features
- Bluetooth 5.0 — fast, stable wireless pairing with virtually any smartphone, tablet, or audio source (Device ID: YMX-868BT)
- Dual-channel stereo output — 5W × 2 for full-range stereo sound
- Compact PCB — 40mm × 34mm × 9mm (including connectors), perfect for space-constrained builds
- Flexible power input — DC 3.7V–5V (USB or lithium battery); supports 1.5A–2A supply current
- Micro-wave power switch control for convenient on/off operation
- External amplifier output — 3P socket OUT audio output for optional external power amplifier modification (middle = audio ground; L and R on each side)
- USB charging input — charge your lithium battery directly via USB; red indicator light shows charging status
- Package includes: 1× amplifier board + 4× connection cables
Technical Specifications
| Bluetooth Version | 5.0 (Device ID: YMX-868BT) |
| Output Power | 5W × 2 (10W max) |
| Operating Voltage | DC 3.7V – 5V (do NOT exceed 5V) |
| Recommended Current | 1.5A – 2A (minimum) |
| Speaker Impedance | 4Ω recommended (3W×2 at 3.7V / 5W×2 at 5V) |
| PCB Dimensions | 40mm × 34mm × 9mm |
| Audio Output | 3P OUT port (L / GND / R) |
| Pairing Password (non-Android) | 0000 |
| Country of Origin | Made in China |
Wiring Guide
- BAT (Red 2P seat): DC 3.7V–5V positive to +, GND to negative
- Speaker 1 (White 2P seat): L-O- / L-O+ (left channel)
- Speaker 2 (White 2P seat): R-O- / R-O+ (right channel)
- Note: If using a 3.7V lithium battery, remove the IN4007 diode to prevent a ~0.7V voltage drop that may affect USB/card reading
- Voltage must NOT exceed 5V — higher voltage will damage the main chip, power amplifier IC, and related components
Bluetooth Pairing Instructions
- Power on the module — it will automatically enter Bluetooth discovery mode
- On your smartphone, open Settings → Bluetooth and scan for devices
- Select YMX-868BT from the list
- Non-Android devices: enter password 0000 when prompted
- A "Connected successfully" prompt confirms pairing is complete
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Frequently Asked Questions
Q: What power supply should I use with the Bluetooth 5.0 amplifier board?
A: Use a quality DC power supply or lithium battery providing 3.7V–5V at a minimum of 1.5A–2A. Do not exceed 5V, as this can permanently damage the amplifier IC and main chip. For two speakers running at full output (5W×2), ensure your source can deliver at least 2A continuously. Avoid low-quality adapters — unstable current causes audio distortion or module restarts.
Q: What speaker impedance is compatible with this amplifier board?
A: The board is designed for 4Ω speakers. When powered by a 3.7V lithium battery, use 4Ω / 3W×2 speakers. When powered by a regulated 5V supply, use 4Ω / 5W×2 full-range speakers for optimal stereo performance.
Q: Can I use this board to drive an external power amplifier?
A: Yes. The 3P block labeled OUT provides a dedicated audio output: the middle pin is audio ground, and the left/right pins carry the L and R channels respectively. Simply connect these to your external amplifier's input instead of (or in addition to) the onboard speaker outputs.
Q: Why is the Bluetooth connection unstable or the module restarting?
A: This almost always indicates insufficient supply current. Check that your power source reliably delivers 1.5A–2A. If using a lithium battery at 3.7V, confirm it can sustain the required discharge current — some cells have adequate voltage but insufficient current capacity, leading to connectivity instability or audio dropouts.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.