Transistor Arithmetic Product Wave Detector Circuit

The picture shows the arithmetic product wave detector circuit composed of dual-electrode transistor. The action of the circuit likes a amplifier. But the base electrode of the transistor is controlled by the local oscillator. The SSB signal would input from the T1's low-impedance secondary coil and then it should be normally amplified by Q1. But the local oscillator inhibiting action stop this process. The local oscillator controls the transistor connected or disconnected. It produces the nonlinear feature needed by demodulation. The picture shows the transistor arithmetic product wave detector circuit.