This type of 80w power amplifier circuit chip is ideal for surround sound systems. Since this is quite compact and can be used for independent amplifier for each speaker. In this way it can be upgraded to share source to support all of the connected amplifier.

List of components of 80w power  amplifier with tda 7294:
Resistors 1/4 watt 5% unless stated other value
R1-22K
R2 680
R3 22k
R4 47k
R5 100k
R6 27k Ohms – Red, Violet, Orange, Gold-value non-commercial use 22k + 5.6 k in series
R7 2.2 ohm 2 watt Red, Gold, Gold
Capacitors
From C1 1μF 100V – Capacitor Polyester Film
C2 47μF 50V Electrolytic Capacitor
C3, C4 10μF 63V Electrolytic Capacitors
C5 22μF 50V Electrolytic Capacitor
C6, C8 1000μF to 4700μF 50V 50 V electrolytic capacitors
C7, C9, C10 Polyester -104 100n, 100n or 0.1
Semiconductors
D1 1N4148
IC1 TDA7294V
Connectors
K1 connector for signal input (Line In)
K2 connector for connecting the source
K3 connector to connect key standby Mute
K4 Connector for Connecting the Speaker

Others
J1, J2, J3 Jumper – Pieces of wire
Other printed circuit board, symmetrical source-33V +33 / 3 + 3A, heat sink, etc.

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This 100W bridge amplifier circuit must be powered with + /-25V and 4A. Where to stereo equipment requiring current should be 8A. Load (speaker) must be 8 ohms. With these values​​, the circuit will deliver 100W with a total distortion of less than 0.1% distortion or 150W with a total of about 10%. Because of this feedback to the speaker configuration to bridge the two terminals (positive and negative), the negative terminal should not be transferred to the ground as in other amplifiers. Doing so will cause a short circuit at the output of the chip and damage it by activating protective if not reversed in time.

For power supply can be use classic transformer or a switching power supply, in the latter case the source must be of good quality and filtered. But if weight is not a problem we recommend using a good old transformer with rectifier and electrolytic and ceramic capacitors.

TDA7294:
The manufacturer of this IC (SGS-Thompson) should activate the mute function before using Stand-By. This IC generates 1.3 degrees Celsius per watt of power. That is why we have to put on an adequate heat sink to prevent system overheat and cause overtemperature shutdown.

Although the manufacturer claims that this is a built-in 100v / 100w should be remembered that this specification is technically and theoretically. In practice, the integrated circuit can deliver power over a 50w 8 ohm load at a voltage of 50V for starting which consumes about 2 amperes and generates heat.

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