Audio Line Driver

The video application uses LT1206 as a main components because it has output  derive capability and suitable bandwidth. So that the LT1206 can also be used for audio applications. Here is the schematic diagram:


In this circuit the LT1206 combined with the LT1115 low distortion, that has a very low noise audio buffer with a gain of 10. The frequency response of this circuit is flat to 0.1dB from DC to 600kHz, with a – 3dB bandwidth of 4MHz. The THD + noise for the circuit is only 0.0009% at 1kHz, rising to 0.004% at 20kHz because this circuit uses  a  5VRMS and 32 Ohm load  (780mW). With capacitive loads of 250pF or less, this circuit is stable. [Circuit’s schematic diagram source: Linear Technology Application Notes]