This is a simple but powerfull audio amplifier with high output power of 2x 100W RMS (not P.M.P.O.). Speaker impedance is 4 ohm. Amplifier works in AB class. The amplifier uses TDA7293 integrated circuits with MOSFET outputs. They are similar to the TDA7294, but have increased the maximum allowable voltage from 100V to 120V and are equipped with a clipping detector. Below is a schematic diagram of one channel of the amp and a classic power supply for the entire amplifier (both channels). Stereo logarithmic potentiometer P1 is used to adjust the volume. LED1 indicates signal clipping. This may be caused for example by reduced the supply voltage of the amplifier, excessive ripple in the filter capacitors (their capacity is too small) or simply by too strong input signal. Each channel has its own indicator. Indicators of clipping may be omitted. Amplifier's power supply is symetrical, with a classic mains power transformer. 100n capacitors should be placed as close as possible to integrated circuits to avoid amplifier to oscillate and cause distortion or overheating. Mute and Standby inputs are not used. Even without the use of them there were no significant impulses during power on or off. If you need, you can use those inputs to implement the standby switching of the amplifier.
