TDA7294 технический паспорт и усилитель | против LM3886

TDA7294 Amplifier Board (Stereo mode and bridged mono mode

TDA7294

The TDA7294 is a classic audio amplifier chip, perfect for DIY high-quality sound systems. With ±35V supply, it delivers 70W into 8Ω or 100W into 4Ω, and up to 150W in BTL mode. It offers great audio clarity with THD below 0.005%. Built-in mute, standby, and full protection make it safe and easy to use. Its wide voltage range (±10V–±40V) and solid power output make it ideal for home or semi-pro audio projects.

TDA7294 Pinout

When you’re using the TDA7294 for your amp, remember these tips: the output pin (pin 6) connects directly to your speaker, so use thicker wires and keep it close to ground for stable performance. Connect a 10µF capacitor between the Bootstrap pin (pin 8) and the output—this helps drive the internal power transistor.

Pins 3 and 4 handle standby and mute controls, which you can easily set up with either an MCU or a simple resistor divider. And make sure the heatsink tab (pin 10) is connected to ground or your negative voltage rail (-Vs) for better heat dissipation.

TDA7294 Equivalent Power Amplifier

When you’re using the TDA7294 for your amp, remember these tips: the output pin (pin 6) connects directly to your speaker, so use thicker wires and keep it close to ground for stable performance. Connect a 10µF capacitor between the Bootstrap pin (pin 8) and the output—this helps drive the internal power transistor.

Pins 3 and 4 handle standby and mute controls, which you can easily set up with either an MCU or a simple resistor divider. And make sure the heatsink tab (pin 10) is connected to ground or your negative voltage rail (-Vs) for better heat dissipation.

TDA7294 Mono Amplifier Circuit Example

If you’re building a high-quality mono amplifier, TDA7294 is your go-to chip. Your audio signal enters from the left through a 22μF capacitor to block DC, and it’s stabilized by 680Ω and 22kΩ resistors for a clean, clear sound.

Power it using a dual power supply (+Vs and –Vs) filtered with 1000μF and 100nF capacitors per rail for minimal noise. At the output, place a 22μF capacitor between pins 14 and 6 to drive the chip’s internal transistor, with a parallel 2.7Ω resistor and 100nF capacitor to ground to eliminate high-frequency oscillation.

For easy mute or standby, just use pins 9 and 10 with simple resistor networks and switches—making it user-friendly for your DIY projects.

TDA7294 Bridge Amplifier Wiring

If you want more power from TDA7294, try the Bridge Tied Load (BTL) setup. Use two TDA7294 chips: one for your original audio signal (positive phase), the other for an inverted signal. Connect your speaker directly between the two chips’ outputs—no connection to ground. This approach theoretically gives you up to four times the power of a single-chip setup.

A few tips: Generate the inverted audio input using an op-amp like NE5532. Both chips should share a stable dual power supply (±30V to ±38V), and each output pin (Pin6→Pin14) needs a 22µF bootstrap capacitor. Also, doubling the power means more heat, so each chip needs good cooling.

Use a speaker rated at least 8Ω and 150W or more for the best performance and stability.

TDA7294 Subwoofer Amplifier Project

If you’re planning to build a subwoofer amplifier using the TDA7294, this setup is perfect for you. The TDA7294 is powerful enough (up to 100W) and easily drives an 8Ω or 4Ω subwoofer with very clean sound.

Your project will mainly have three parts: the TDA7294 amplifier itself, a low-pass filter built with an NE5532 op-amp (keeping frequencies between 40Hz–150Hz), and an adjustable potentiometer to fine-tune the bass level. Use a dual power supply of ±30V to ±35V with large capacitors to ensure clean power. Remember, proper cooling is essential—use a big aluminum heatsink, and if you can, add a fan.

If you want even more power, use two TDA7294 chips in a bridged setup to easily reach 150W or more—perfect for a home theater subwoofer. Adding DC protection and a delayed startup circuit is a smart extra step for safety.

TDA7294 Home Audio Amp Design

If you’re building a home audio amplifier, the TDA7294 is perfect. It delivers big power (70~100W per chip), excellent sound quality with very low distortion—ideal for 2.0 or 2.1 audio systems.

It’s straightforward: a 22μF capacitor at input to block DC allows connection to Bluetooth modules or decoders. Follow the standard TDA7294 recommended circuit, adding a small RC filter at the output to prevent high-frequency interference. Use a ±25V to ±35V dual power supply with a quality transformer (150W+) and large capacitors (4700μF~10000μF) for clean power.

Remember proper cooling—a large heatsink or even a fan ensures stability. You can also add mute/standby switches or volume controls for convenience.