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Optical receiver field of maintenance
time2012/06/07
Currently, many cable television signal transmission using fiber optic cable, every summer, outdoor optical receiver is often frequently damaged by lightning, power Jihuai maintenance found the proportion of 80% of the total failures, and most of the optical receiver using switch-based regulated power supply. Circuit switch and other parts in the repair market often can not buy. Second, after a lot of lightning RC element values a€?a€?can not identify the RC, so bring some difficulty to repair.
Production of 9912-type field optical receiver is a common model, the switch using FET K1204, oscillating drive Manifold μc2842P, optocoupler 4N35, once the lightning from the power supply into these main components can easily breakdown. Components must mail order from the manufacturers, but also more expensive. To solve this problem, the author of a damaged power supply board in recent years with good results instead of using discrete components, and components from local materials, as long as the original design requirements to achieve a stable +24 V DC voltage, can work.
Use more than 20W output transformer secondary 27V ~ 35V 0.8A or so as well, can also use ordinary amplifier the transformer. D1-D4 with the IN4007, C1 = 1000μf/50V, C2 = 1000uf/35V, IC with the 7824 model.
Production of 9912-type field optical receiver is a common model, the switch using FET K1204, oscillating drive Manifold μc2842P, optocoupler 4N35, once the lightning from the power supply into these main components can easily breakdown. Components must mail order from the manufacturers, but also more expensive. To solve this problem, the author of a damaged power supply board in recent years with good results instead of using discrete components, and components from local materials, as long as the original design requirements to achieve a stable +24 V DC voltage, can work.
Use more than 20W output transformer secondary 27V ~ 35V 0.8A or so as well, can also use ordinary amplifier the transformer. D1-D4 with the IN4007, C1 = 1000μf/50V, C2 = 1000uf/35V, IC with the 7824 model.