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The ultrasonic receiving circuit composed of the operational amplifier is composed of an integrated operational amplifier A. , A:, A to form. R. c is the filter network, diode D. ?CR is the detection network. (Click to enlarge) 
Led Underground Light have
many designs, such as fixed ground light, adjustable buried ground light and
contemporary recessed design.
Fixed ground lights, fixed buried ground uplighters for driveways and pathways.
Adjustable buried ground lights, ideal for uplighting walls, fences and
features. Recessed ground lights providing a great projected light source. LED
recessed uplighters ideal for lighting up features. In ground light fittings
great for uplighting.
Contemporary recessed ground lights, great effective uplighters for a variety
of lighting effects.
3W Led Underground Light,Led Underground,Led Underground Light,Led Underground Paving Light
ZHONGSHAN G-LIGHTS LIGHTING CO., LTD. , https://www.glightsled.com