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The gas limiting alarm miner lamp circuit diagram 4

2016-08-09 05:20  
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The gas limiting alarm miner lamp circuit diagram 4
The gas limiting alarm miner lamp circuit is composed of the gas detection circuit, multivibrator, audio output circuit and the lighting circuit, and the circuit is shown as the chart. Gas detection circuit is composed of the gas sensor and resistors R2, R3. Multivibrator is composed of the two NAND gates D1, D2 which are inside of the NOT gate IC and resistors R4 and R5, capacitor C2. Audio output circuit consists of resistor R6, audio amplification tube V and speaker BL. Lighting circuit is composed of the battery GB, illuminating lamp EL and light switch S. R1 uses 1/2W carbon film resistor; R2 uses small sealed variable resistor; R3 ~ R6 select 1/4W carbon film resistors.