Our schematic is almost the same as in datasheet. I have been looking for a source of PCBs using parallel TDA7293s… there are not many out there that you can buy. Having built single chip amp and extensive listening TDA7293 is my favorites for IC power amp applications. This IC can run up to 100V, low distortion, and can easily be paralleled.
This is when I and my friend John found the datasheet of TDA7293. I needed something as easy, but more powerful. Circuit Diagram.As part of my home theater build, have decided to go for 3 way actives for front LCR… so, need to build 9 power amps for fronts and 8 amps for surrounds… to pair up with my Sherbourn PT-7020A pre/pro. C2 is a feedback capacitor and it also provides DC decoupling.
R4 and R6 is used for setting type closed loop gain and with the used value, gain is 30dB. R5 is the input resistance and the amplifiers input impedance has a direct relationship to its value. S1 and the mute switch and S2 are the standby switch. R2 and C6 sets the mute time constant while R3 and C5 sets the standby time constant. RC network comprising of R1 and C1 improves the high frequency stability of the amplifier and also prevents oscillations. C3 and C9 are power supply filter capacitors while C10 and C4 are bypass capacitors. C8 is the input coupling capacitor and the input is applied to the non-inverting input (Pin3) of the IC. In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. The IC is available in multiwatt 15V and multiwatt 15H packages. The IC has built in short circuit protection and thermal shutdown circuitries. The TDA7294 has low noise, low distortion, good ripple rejection and can be operated from a wide range of supply voltages. The IC has a DMOS output stage and can deliver 100W RMS into an 8Ohm speaker at +/-38V dual supply. TDA7294 is an integrated, monolithic, Class AB audio amplifier designed specifically for Hi-Fi applications.
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