wire break informing device of rural cablecasting circuit

Published:2011/7/19 23:37:00 Author:chopper | Keyword: cablecasting, wire break, informing device | From:SeekIC

The principle of circuitThe wire break informing device of rural cablecasting circuit is formed by the carrier transmitter circuit,the carrier receiving circuit, alarm circuit and power supply circuit,which is shown in figure 4-212. 　　Carrier transmitter circuit (installed in the terminal of cable broadcasting line) is formed by the high-frequency oscillator and amplified output circuit.The high-frequency oscillator is formed by non-gate D1,D2,resistor R1,capacitor C1 and potentiometer RP1 which are in the non-gate integrated circuit IC1 (D1-D3);and the amplified output circuit is formed by the non-gate D3,capacitors C2-C6,transistor V1,V2,resistors R2, R3 and intermediate-frequency transformer T1 that are in the non-gate D3.



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