A simple 100-watt power amplifier circuit composed of TDA7294

TDA7294 contains a variety of functions such as pre-op amplifier, final power amplifier, temperature protection, short circuit protection, and mute control. The power amplifier circuit composed of TDA7294 has simple peripheral circuits, easy to manufacture, high input impedance (20KΩ), input sensitivity 750mV, voltage gain 32dB, power supply voltage range ±25~40V, quiescent current 50mA. When the load impedance is 8Ω, the output power can reach 100W.

In actual production, a large enough heat sink and a power supply with sufficient power should be ensured.

If you need to increase the voltage gain of the overall circuit, you can change the ratio of R3 to R2.

Voltage gain: A=20lg (R3/R2) dB.

Don’t pursue too high voltage gain, so as not to cause uncontrollable self-oscillation.

To have a high voltage gain, you need to add a pre-amplifier.

As shown in the figure below, it is an easy-to-make 100-watt power amplifier circuit composed of TDA7294.



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