Environment oxygen deficiency detects and automatic circuit of airing exhaust

The utility model relates to an environment oxygen deficiency detects and automatic circuit of airing exhaust belongs to and detects technical field. The utility model discloses a signal produces circuit, alert circuit and implementation of circuit, alert circuit and implementation of circuit all with signal production circuit connection, signal production circuit includes oxygen content sensor, AD converter and the amplifier circuit who connects gradually, alert circuit include digital display circuit and acousto -optic warning circuit, implementation of circuit be the scavenger fan circuit,digital display circuit pass through decoding and driving ware and signal and produce circuit connection, acousto -optic warning circuit and scavenger fan circuit pass through the comparator and produce circuit connection with the signal, acousto -optic warning circuit and scavenger fan circuit all be connected with the collecting electrode of triode, compare with prior art, the utility model discloses an ingenious circui