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Wien bridge oscillator circuit controlled by photosensitive

2016-05-18 22:04  
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Wien bridge oscillator circuit controlled by photosensitive resistance
This diagram is wien bridge oscillator circuit controlled by photosensitive resistance. Usually it uses lamp and FET tube for the stability of wien bridge oscillator circuit amplitude. When you use lamp, the amplitude dynamic range can increase. But the response speed will become slow. When you use FET tube, the response speed will increase. But the amplitube dynamic range will become narrow. As the circuit shown in the figue 6-3, the amplitude stabilized element adopts optical coupler MCD521H composed of LED and photosensitive resistance to solve the problem. This is a kind of fast response, wide dynamic range and no mechanical vibration influence, quality oscillation circuit.