Summary of 5 W + 5 W DUAL BTL CLASS-D AUDIO AMPLIFIER
This project is a compact dual BTL class-D audio amplifier based on the TDA7491LP13TR, delivering 5W+5W into 8 ohms from a single 9–12V DC supply. The low-profile PCB supports single-ended or differential inputs, selectable gains via jumpers, standby and mute, thermal overload protection, and no power-on/off pop. PCB size is 63.25 x 32.39 mm.
Parts used in the 5 W + 5 W DUAL BTL CLASS-D AUDIO AMPLIFIER:
- TDA7491LP13TR (ST class-D audio amplifier IC)
- Low profile PCB (63.25 x 32.39 mm)
- Power supply connector (for 9–12V DC)
- Speaker output terminals (for two 8 ohm speakers)
- Input connectors for single-ended and differential audio signals
- Jumpers for gain selection (20dB, 26dB, 30dB, 32dB)
- Jumpers for standby and mute functions
- Passive components and layout components required by TDA7491LP13TR (resistors, capacitors, traces for filtering and stability)
- Thermal management components/PCB copper for overload protection
The project described here is a high-efficiency dual BTL class-D audio amplifier with single supply operations. The project was built using TDA7491LP13TR from ST. The low profile PCB design can fit in a small area, operating power supply 9-12V DC, Project supports single-ended or differential audio signal inputs. Jumpers are provided to set the various gains, standby, and mute functions.
KEY FEATURES
- 5W + 5W Continuous Output Power, 10% THD, (8 Ohms Speaker) at 9V DC
- Single Supply Operation 9V to 12V
- Four Selectable Fixed Gains Settings of nominally 20dB, 26dB, 30dB, 32dB Using Jumpers
- Differential Inputs Minimize Common-Mode Noise
- Jumper for Single-Ended Inputs
- No “Pop” Sound at Turn-On/Off
- Thermal Over Load Protection
- Standby and Mute Features Using Jumpers
- PCB Dimensions 63.25 x 32.39 mm
Read more: 5 W + 5 W DUAL BTL CLASS-D AUDIO AMPLIFIER
- What IC is used in this amplifier?
The amplifier uses the TDA7491LP13TR from ST. - What supply voltage does this project require?
The project operates from a single 9V to 12V DC supply. - How much output power does the amplifier deliver?
It delivers 5W + 5W continuous into 8 ohm speakers at 9V DC with 10% THD. - Can the amplifier accept both single-ended and differential inputs?
Yes, it supports single-ended or differential audio signal inputs with a jumper for single-ended inputs. - How are gain settings configured?
Four fixed gain settings (approximately 20dB, 26dB, 30dB, 32dB) are selected using jumpers. - Does the amplifier have standby and mute functions?
Yes, standby and mute features are provided and controlled using jumpers. - Is there any pop sound at power on or off?
No, the design prevents a pop sound at turn-on and turn-off. - Does the amplifier include thermal protection?
Yes, it includes thermal overload protection. - What are the PCB dimensions?
The PCB measures 63.25 x 32.39 mm.
