TDA7492P Wireless Bluetooth 4.0 Audio Receiver – User’s Guide
Last Updated OnSeptember 2, 2025
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Overview
The TDA7492P module is a high-efficiency Class-D stereo amplifier with an integrated Bluetooth 4.0 receiver. It delivers up to 50W per channel (2 × 50W) and is ideal for wireless speaker builds, kiosks, robotics, and embedded audio systems.
Key Features
Feature
Description
Amplifier Chip
TDA7492P Class-D stereo amplifier
Bluetooth Chipset
CSR8635 (Bluetooth 4.0)
Output Power
2 × 50W @ 6Ω, 25V DC
Input Voltage
8V – 25V DC (recommended: 12V–24V)
Speaker Impedance
4Ω – 8Ω
Gain Settings
DIP switch selectable: 21.6 dB to 33.6 dB
Audio Input
Bluetooth only (no AUX or line-in)
Audio Output
Dual speaker terminals (L/R)
Size
~82mm × 50mm
Pinout & Connectors
Connector
Function
DC Jack (2.1mm)
Power input (8–25V DC)
Speaker OUT L/R
Connect left and right speakers
DIP Switches
Set amplifier gain level
Bluetooth LED
Status indicator (pairing/connected)
Bluetooth Pairing Instructions
Power on the module using a regulated 12–25V DC supply.
The LED indicator will blink—indicating pairing mode.
On your device (phone, tablet, PC), enable Bluetooth and search for:
“Xinrui Audio” or similar device name
Tap to pair—no password required.
Once paired, the LED turns solid blue.
All system audio will now stream to the amplifier.
Supports Bluetooth 4.0 and backward-compatible with 3.0/2.1 devices.
Speaker Setup
Use 4Ω–8Ω speakers, rated for 30W–60W for optimal performance.
Connect directly to the L/R speaker terminals.
Ensure correct polarity: + to +, – to –
Avoid combining speaker grounds—this can damage the board.
Gain Configuration (DIP Switches)
Gain Level
DIP Switch Setting
Use Case
21.6 dB
All OFF
Low volume, headphones
27.6 dB
SW1 ON
Small speakers
31.1 dB
SW2 ON
Medium speakers
33.6 dB
SW1 & SW2 ON
Large speakers, max output
Always power off before changing DIP settings.
Integration Tips
Use a regulated power supply (e.g., 19V laptop adapter or 24V SMPS)
Mount on non-conductive standoffs to prevent shorts
Keep Bluetooth antenna area unobstructed for best range
For enclosure builds, consider ventilation or passive heat sinking
Troubleshooting
Issue
Solution
No sound output
Check speaker polarity and power supply
Bluetooth not connecting
Reset paired devices, ensure 12V+ input
Distorted audio
Use higher voltage supply, check speaker load
Overheating
Reduce gain or add passive cooling
Application Ideas
DIY wireless bookshelf speakers
Bluetooth-enabled kiosks or vending machines
Portable sound modules for robotics or medical devices
