This power amplifier use IC TDA1037 or you can use TDA1037D for main operation . Minimum require voltage 4 volt and maximum voltage 28 volt , a considerable distance away stress. And power output 5 watt and maximum 10 Watt with imoedance 4 Ohm. The output is filteriing and low noise. see amplifier circuit schematic below : You can use the amplifier at : Tuner Preamp head Preamp Mic CD / DVD or other electronic device.