F346 designed program-controlled op amp audio start switch amplifier circuit principle

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Working principle: The following figure shows the audio starter switch amplifying circuit composed of four-programmed integrated operational amplifier F346. The programmable op amp is the constant current source circuit of the op amp that can be controlled externally. When the constant current source is injected into the bias current, the op amp is in the working state, otherwise it is in the off state. In addition, when changing the bias value, the parameters of the op amp will also change. The op amp A is composed of a non-inverting amplifier. The output is divided into two parts, one enters the half-wave rectifier B, the other enters the amplifier C (the amplifier C is connected to the follower), and the op amp D acts as the voltage comparator, and the reference voltage VR is added to the opposite. Phase input.