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In 1967 Greg created a back pack, named the Expedition Pack, with internal phenolic resin laminate stays, later revised to 6061 aluminium flat bar, being a frame which facilitated the carrying of heavy loads and a unique chest strap designed to attach to a haul rope while still wearing the pack. This sturdy special chest strap was changed to a ...
Field pack (large) – The construction and materials in the large field pack are similar to the medium field pack with the differences being: it is much larger in size; the center outside pocket is larger than the other two main outside pockets; and the addition of three small outside pockets above the larger pockets. The large field pack MUST ...
Opto-isolator VTL2C1 with LED input and photoresistor output. Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator [notes 1] or lamp-coupled photocell, [1] is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically ...
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]
Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor. The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction. The photoresistivity of any photoresistor may vary ...
Two different types of phototubes. A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from photovoltaic or photoconductive cells.
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