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:

New Circuits

.

 


Popular Circuits

NiMH / Nicad Charger
VHF remote control
5 And 12V Ac Powered Switching Supply
Mathematical approch to measuring current voltage and resistance of mixed series and parallel
fm transmitter circuit with max2606
24v dc power supply using lm7824
MFOS NOISE TOASTER Lo-Fi Noise Box



Top