TDA7294 BTL power amplifier 2x 150W. The TDA7294 is a single-chip integrated circuit housed in a Multiwatt15 package, designed for use as an audio class AB amplifier in high-fidelity applications such as home stereo systems, self-powered loudspeakers, and top-tier televisions. Its wide voltage range and high current output allow it to deliver maximum power to both 4 ohms and 8 ohms loads, even when the power supply regulation is subpar, while also providing excellent rejection of high supply voltages. The integrated muting function with a delayed turn-on feature simplifies remote operation and eliminates any switching on-off noise.
Using a ±25v power supply can output up to 100w×2 THD approximately 0.1 at 8Ω (refer to the datasheet). Using a ±35v power supply may achieve higher power and lower THD, up to 150w×2. It is recommended to use a power supply of ±25v to ±30v (I personally use ±30v). It is suggested to use an AC dual 25v or 24v transformer. After rectification, the power will be approximately ±35v with a power of 300W. At least two 10000uf capacitors are needed for rectification (one for positive and one for negative) to ensure voltage ripple during high dynamic range.
The TDA7294 BTL power amplifier is a high-performance audio amplifier capable of delivering a maximum power output of 150 watts per channel. With a total output power of 300 watts, this amplifier is perfect for driving large speakers and creating a powerful sound system. The BTL (Bridge-Tied Load) configuration allows for increased efficiency and power output, making it ideal for use in home audio systems, professional sound reinforcement, and other applications where high-quality audio performance is essential. With its compact size and easy-to-use design, the TDA7294 BTL power amplifier is a versatile and reliable choice for those looking to enhance their audio experience.
Schematic TDA7294 BTL power amplifier 2x 150W
BOM TDA7294 BTL power amplifier 2x 150W
Parts | Value | Description | Quantity |
---|---|---|---|
Resistors | |||
R2,R11,R17,R23 | 680R (681) | R0805 – SMD resistor | 4 |
R6,R7,R13,R19,R27,R28 | 20K (203) | R0805 – SMD resistor | 6 |
R20,R8,R14,R5,R1,R12,R18,R24, R25,R26,R29,R30,R31,R32,R33,R34 |
10K (103) | R0805 – SMD resistor | 16 |
R21,R9,R15,R4 | 30K (303) | R0805- SMD resistor | 4 |
R22,R10,R16,R3 | 22K (223) | R0805- SMD resistor | 4 |
Capacitors | |||
C32,C3,C22,C11,C2,C12,C21,C31 | 22uF | C0805 – SMD capacitor | 8 |
D4,D2,D3,D1 | 1N4148W_C727110 | SOD-123 Switching Diode | 4 |
C6,C7 | 1000uF/50V | Electrolytic Capacitor | 2 |
C1,C4,C19,C20,C30,C40 | 1uF | Film capacitor | 6 |
C8,C9,C14,C15,C24,C25,C29,C34, C35,C39,C43,C44,C45,C46,C47,C48 |
0.1u | C0805 – SMD capacitor | 16 |
C5,C10,C13,C18,C23,C28,C33,C38 | 22uF/50V | Electrolytic Capacitor | 8 |
C41,C42 | 1000uF/25V | Electrolytic Capacitor | 2 |
Semiconductors | |||
U1,U4,U6,U8 | TDA7294V | Monaural 100Wx1@8Ω AB Class Amplifier MultiwAtt-15 Audio Amplifier |
4 |
U2,U3,U5,U7 | NE5534P | Single channel DIP-8 Operational Amplifier | 4 |
U9 | L7815ABV-DG | 1.5A Fixed 15V Negative TO-220 Voltage Regulator Linear Low Drop Out (LDO) |
1 |
U10 | L7915CV | 1.5A Fixed 15V Positive TO-220 Voltage Regulator Linear Low Drop Out (LDO) |
1 |
Miscellaneous | |||
CN1 | WJ25C-B-7.62-3P-13-00A | 1x3P 7.62mm Barrier Terminal Block | 1 |
P1 | WJ25C-B-4P | 1x4P 7.62mm Barrier Terminal Block | 1 |
U11 | KF128-2.54-3P | 1x3P 2.54mm Screw Terminal Block | 1 |