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The seeder channel block alarm (2)

2017-01-06 19:19  
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The seeder channel block alarm (2)
The working principle of the circuitThe seeder channel block alarm circuit consists of the photoelectric control circuit, single steady circuit, 1HZ multi-resonance oscillator, 1KHZ multi-resonance oscillator phase indicator circuit, see as figure 4-104. The photoelectric control circuit consists of the indicators HL1 and HL3, transistors V2 and V3, resistors R6-R11, capacitors C8-C11, diode VD1 and reset key S1.The astable circuit consists of the potentiometer RP1, capacitors C1 and C2, time-base integrated circuit IC1.