70W TDA7294 Amplifier


70W TDA7294 Amplifier

 

70W TDA7294 Amplifier

 


The following is a 70W amplifier based on a popular TDA7294 chip. Main technical characteristics of the amplifier are as follows: input resistance – 22 kOhm input voltage – 750 mV nominal output power at 4 ohms and THD 0.5% – 70 Watts Frequency Range – 20 … 20000 Hz supply voltage – ± 27 V, quiescent current – 60 mA. The amplifier has a built-in thermal protection, and protection against overload and short circuit in the load. For “soft” switching amplifier is SA1. Switch can be powered from a bipolar unregulated power supply. Power AC Transformer – 250-A, the secondary winding should be designed to current than 5A.

70W TDA7294 Amplifier

Details of the amplifier are mounted on a printed circuit board (Fig. 3) of the bilateral foiled fiberglass dimensions 50×35 mm board assembly shown in Fig. 4. For installation use resistor-0.25, capacitors C4-C7, CIO – imported analogs C50-35 and K73-17 (the rest). As SA1 apply any miniature push button switch.



The head of the speaker – with a broadband impedance of 4 ohms and capacity not less than 50 watts. Connect chip to the heat sink on an area of 600 cm.



For better heat transfer her body should be lubricated with a thin layer of thermal paste. Because the chip is connected to the body minus the power wires, it should be isolated from the amplifier.

70W TDA7294 Amplifier

70W TDA7294 Amplifier


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