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LiftMaster — the company's line of garage door openers for professional installers. Raynor — the company's line of garage door openers for professional installers. This line of professional installers is slightly less common than LiftMaster. Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix ...
Electric eye for a garage door opener. An electric eye is a photodetector used for detecting obstruction of a light beam. An example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam.
Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.
Similar to the DC-6A, the military version was the USAF C-118 Liftmaster; the USN R6D version used the more powerful R-2800-CB-17 engines. These were later used on the commercial DC-6B to allow international flights. [4] The R6D Navy version (in the late 1950s and early 1960s) had Curtiss Electric constant-speed reversing propellers. [citation ...
Schematic diagram of an opto-isolator showing source of light (LED) on the left, dielectric barrier in the center, and sensor (phototransistor) on the right [note 1]. An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light. [1]
Eyepiece: Performs the final focus correction before the light reaches the eye. Charge-coupled device (CCD): A light-sensitive integrated circuit digital sensor (commonly used in digital cameras) that turns light into an electrical charge used to collection image data. Generally applicable to all items:
English: The eye diagram for a binary PSK channel. Made using MATLAB, converted to SVG with this script , and final editing done with Inkscape. If you want the MATLAB code feel free to contact me.
This became the Douglas Model 415 and a cost-plus contract worth more than $50 million was signed 25 June 1942 for 50 aircraft and one static test article. The resulting production aircraft was 31 ft (9.4 m) longer than the C-54 Skymaster , and would be 24 ft (7.3 m) longer than the proposed C-118 Liftmaster ; [ 2 ] no experimental XC- or YC-74 ...