The ultrasonic receiving circuit composed of op amp is composed of integrated op amp A. , A :, A to constitute. R. c is the filter network, diode D. ? CR is the detection network. (click to zoom in) 
solar &wind hybrid street lighting system have prominent advantages of compact design, energy saving and self-powering. In this system, wind turbine are complemented by solar power in supplying power for Led Lamp, as to its hybrid characteristics, which could provide a balance.It's advantages is that if rainy days,cannot use the sun power,then the wind power can work instead.It applies to the place where wind power is strong.
Solar Wind Hybrid Street Light
Solar Wind Hybrid Street Light,Hybrid Solar Street Light,Wind Solar Street Light
Yangzhou Beyond Solar Energy Co.,Ltd. , https://www.ckbsolar.com