Novel Audio Amplifier System Using Opt-Coupling of LED and PD

This paper proposes a completely new and simple audio amplifier system using the opt-coupling of LED (Light Emitting Diode) and PD (Photo Diode), without using conventional devices such as Transistor IC and Vacuum Tube. This paper also explains that the opt-coupling device works in the same way as a bipolar junction transistor and so that the audio amplifier can be realized in a simple form. Since the proposed audio amplifier shows good sound with very low noise characteristic, we consider that the audio system becomes a promising Kansei product.