gas sensor,tempreture sensor &voice senseor{help me plea

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maral_7133

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hi to every body
who can help me about 3 sensor?
I want to wire these circuit but how can I do it?
I need the circuit of these sensor:LM34,MQ4
who know about the sensor that can senses the human's voice,& what's the name & the circuit of it?
please,please,please, please help me,help me.
thanks a lot.
 

MQ4 application circuit you will get from huwai electronics, try it out, couple of years back i have done it

__sree
 

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