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Multi channel Signal Telemetry System for Coal Mines with Carrier Wave Transmitted by Telephone cable

ZHONG Daochang (Shandong Mining Institute, Shangdong Tai'an 271019)  
Here introduced is the circuit composition of coal mine multi channel signal telemetry system with carrier wave transmitted through telephone line and precise V/F conversion circuit designed with LM331 and TL082. Problems encountered in system commissioning and execution and the measures adopted are analyzed.
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