temperature sensor relay switch circuit

Posted on Feb 7, 2014

on the desired temperature. The circuit can be used for many purposes for example switch on the fan on the desired temperature or activate emergency temperature alarm etc. The circuit can be powered by a 9 volt battery, adaptor or transformer. The two BC547B transistors are connected as a Darlington pair to increase the sensitivity or gain of the

temperature sensor relay switch circuit
Click here to download the full size of the above Circuit.

circuit. A 20K variable resistor is used to adjust the desired level of heat on which you want to activate the relay switch. Try to fit the thermistor a little bit away from the other components so it will not get their heat.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Pic-Plot : a GPIB to RS-232 converter
    50 MHz range frequency counter using ATtiny45 microcontroller
    the water-saving irrigation system design of ZigBee wireless sensory network
    Human Voice A1 Loud Clear English Talking Watch 2 Alarms Rooster Crow 12 24
    Switchable Output Crystal Oscillator
    KG6MVBs Rig to Computer interface
    Solar Charger Build
    Automatic Garage / Shed Alarm
    555 electrical equipment overload and a phase circuit protection device
    Simple and practical power SCR trigger circuit diagram
    Vibration sensing Voice FM radio transmitter circuit ND-2 TM-801A