Programmed Temperature Controlled Fan



Programmed Temperature Controlled Fan
Circuit depiction
The circuit of programmed temperature controlled fan is work around temperature transducer AD590 took after by operational speaker LM324. AD590 is a temperature transducer, change temperature into relating voltage. The yield of transducer is given to stick 2 of IC2 LM324. The two reference voltage is given to stick 6 and stick 10 through factor resistor VR1 and VR2 individually. The estimation of these variable resistor is altered by temperature (i.e. RL1 invigorated when temperature is above 300C and RL2 stimulated when temperature is underneath 230C). 


 
The yield is taken from stick 7 and stick 8 which facilitate given to base of transistor T1 and T2 through resistor R5 and R6 separately. Transistor T1 and T2 is utilized as hand-off driver transistor. The two info is given from two distinctive phase of controller. 

Control supply Circuit:- The essential AC voltage is venture down to 12 – 0 – 12 by utilizing transformer X1 which assist amended utilizing span rectifier (D1 through D4). The amended yield is separated utilizing capacitor and given to information stick 1 of voltage controller IC 7812 (IC1). The managed yield is taken from stick 3 of IC1 where stick 2 is grounded.