Portable alcohol detector alarm circuit

  
Circuit works: QM-NJ9 is alcohol sensor. QM-NJ9 contact after the odor of alcohol, the resistance value A, B between the reduced
Portable alcohol detector alarm circuit - schematic

potential accounting point rise. The more alcohol concentration, the higher the B point potential. This signal voltage by a sensitivity adjustment potentiometer output Rp slide arm out, was added to a dual voltage comparator LM358 3,6 feet.




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